Alpine KTP-445U Power Pack
Scott from Woodbine, MD on 4/13/2023
2017 Ford Mustang
Works great for the money, and easy to install.
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0 of 0 found this helpful
Getting the most from upgraded speakers
Jaye from Mount Juliet, TN on 4/12/2023
2022 Chevrolet Silverado 1500
I upgraded the speakers in my 2022 Silverado with JL Audio door speakers and Pioneers in the dash. Alone they were a decent upgrade but adding this amp has brought it up to a whole other level. It is a huge improvement over the factory system! Installation under passenger seat was simple enough. I also got a harness, an amp wiring kit, and connectors. I should've order speaker wires too but was able to get some locally. I set the gain using test tones on Apple Music and they are almost all the way down. It does not get hot at all. Just slightly warm.
Pros: Simple install. Doesn't get hot
Cons: None
0 of 0 found this helpful
LOUDER!!!
Bradley from Woodlawn, IL on 12/23/2022
2020 Ford F-150 XLT
So small yet so powerful! Makes my '20f150 sound like it should have from the factory.
Pros: Compact, built in filters, selectable 2/4 channel
Cons: Cutting the RCA's to connect to oem?? COME ON ALPINE!!!
0 of 0 found this helpful
Alpine KTP-445U Power Pack
James from Killingworth, CT on 12/20/2022
2013 Jeep Wrangler
I have purchased this 4 times across numerous applications from my Tundra, BMW motorcycle and 2 jeep wranglers. Quality sound, easy to install and unlimited options to mount based on its size.
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0 of 0 found this helpful
Power and clarity comes in small packages
Kurt from Lake Forest, CA on 9/19/2022
2021 Toyota Highlander
This little amp packs a punch! I wasn't expecting this to add a whole lot to the sound quality or volume, but after adding it and dialing in the cross overs and gain, I am very impressed. I chose this so I could keep my factory head unit and not have to mess with making all the tied in systems and dash controls work with an aftermarket unit. It was also small enough to fit behind my radio without having to install in another location. My only concern is how hot it will run back there, but obviously this was designed to be installed like this, so hopefully it will continue to perform well. Install required a LOT of wire connections for my vehicle, but Crutchfield's tech support provided the wiring diagrams I needed to make sure it was setup correctly. Could I have bought this for slightly cheaper somewhere else? Yes. Why didn't I? Because the support Crutchfield gives you to install makes it as simple as it can be and they helped me troubleshoot issues and provide me updated diagrams (thanks Ben from tech support!) needed to make the proper connections. Save yourself some headaches and go with Crutchfield, and if you are looking for more power and cleaner sound with a factory radio, I highly reccommend this amp.
Pros: Fits behind radio in most cars Taps into existing power and ground (if 15amp fuse or higher) Powerful and clear
Cons: A lot of wire connections to make Not the easiest to install
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Dylan from St Thomas, VI on 8/15/2022
Outstanding mini amp. Fits under the existing head unit. Easy to wire.
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0 of 0 found this helpful
Great sound
Don from Venice, FL on 7/21/2022
1997 Porsche Boxster
paired with a Pioneer 4660 dual din Apple Car Play receiver in a '97 Boxster. The Alpine takes it to a completely different audio level. Get it with the receiver and install at the same time.
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0 of 1 found this helpful
Pretty great!
Elijah from Hartford, CT on 7/17/2022
2007 Subaru Outback
This tiny amp gives pretty great volume and sound quality to my aftermarket set up, but I find it concerning that it is running so hot. Unless I have it tuned incorrectly and it's clipping. Otherwise I think there's plenty of power for a great system.
Pros: Small Plenty of power Flexible wiring options Good sound quality
Cons: Seems to run warm Runs best with rca, but only comes with female rca connectors. Will need rca adapters.
0 of 0 found this helpful
Low Power and High Noise
David from Greenville, OH on 5/5/2022
2016 Chevrolet Cruze
I would like to throw my review in here as well with my experience with his amp. I've been using this amp for around a year and haven't been happy with it from day one. Day one I didn't see any noticeable sound improvement. Gain matching did little to nothing. Like some of the other reviewers have noted there is a noticeable hum in the speakers when on low/no volume. My grounds on are solid and I've been able to fix any other troubles I may have had with other pieces of equipment but this one is the amps issue. My factory amp actually puts more oomf into my speakers than this amp and has no noise! I'm currently shopping for another aftermarket amp to power my front stage as well as possibly swapping out the factory radio for an aftermarket headunit! Good Luck!
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Cons: No noticeable sound improvement, Very noticeable buzz with low/no volume.
1 of 2 found this helpful
Alpine KTP-445U Power Pack
Michael Ray from Louisa, KY on 3/10/2022
2005 Ford F-150
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Hank from Ridgefield, NJ on 2/21/2022
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Apo, AP on 11/14/2021
2010 Honda CRV
It really brings my music to life!! Paired it with rhcAlpine w-650 headunit and it sounds amazing. I got also the alpine halo sub 12. Sounds great
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0 of 0 found this helpful
Using for Rear Speakers Only
Crutchfield customer from Saint Peters, MO on 11/8/2021
2018 Dodge Challenger
Using for Rear Fill Speakers on a 2018 Dodge Challenger. HU to PAC Amp Pro going to a JL Audio TWK88 going into a Alpine 4 Channel Amp and also the KTP-445U for 2 Channel Rear Sound. RCA cables for everything. Tied into the remote turn-on wire of the PAC Amp Pro. For those that want to know, I attached the yellow power wire directly to the battery, fused with a 15 Amp fuse. No problems so far.
Pros: Small Footprint Easy to Install Sounds Great
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Rowley, MA on 10/3/2021
1999 Chevrolet Astro
I'm not getting better sound like I expected, just louder. I will be reviewing base settings further to see if I'm missing something.
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0 of 2 found this helpful
Alpine KTP-445U
Crutchfield customer from Marrero , LA on 9/29/2021
2015 Chevrolet Silverado 1500
I love this amp it's small but it packs a big punch and it fits behind my factory radio easily also very easy to install. I would recommend this amp to anyone who wants to enhance the sound in there factory radio.
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Window Rock, AZ on 9/22/2021
Alpine is the best!
Pros: a lot of power!
Cons: install took sometime
0 of 0 found this helpful
Spectacular little amp.
Frank from CONNERSVILLE, IN on 8/8/2021
Bought this amp for my 2017 Subaru Impreza. Wanting to improve my stock system. Replaced stock speakers with Infinity reference in all doors. The simplicity of integrating this amp with the stock system was amazing. If your stock system has a 15A at the radio, you can power it tapping into the stock wiring harness. No need to run power and ground wires. Sound quality is amazing. Had to set the gains close to 0. You will not be disappointed.
Pros: Easy installation, quality product. Can't go wrong with Alpine. Highly recommend.
Cons: None
1 of 1 found this helpful
Small but powerful
Deezer from Riverside, CA on 7/25/2021
0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Butler, PA on 6/15/2021
2019 Subaru WRX
This little amp is nothing short of amazing. Installed in a 2019 WRX with base audio. The stock head unit and speakers just need a little push and the power pack does the job well.
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3 of 4 found this helpful
Best Customer Service in the industry
Crutchfield customer from Billings, MT on 6/9/2021
2008 Hyundai Accent
Customer service is just great and it doesn't get any better.
Pros: everything was just positive
Cons: nothing to batch about
0 of 1 found this helpful
Alpine Class D gets an A+
Crutchfield customer from Montgomery, TX on 6/7/2021
Bought an ILX-W650 almost a year ago knowing that I would add this baby and wow, what a treat it was. I elected to run a decent set of components (2-way) Polk up front and hid this thing behind the head unit in my son's Focus where there was still enough room to hide my mason jar full of money that I saved not wasting it on something more expensive. I kept the system simple and paired the front state with the Infinity 6001A mono pushing a dual VC Dayton reference 10 and this system will loosen fillings from your teeth or shatter a wine glass depending on the genre your decide to listen to. Alpine never lets you down with great products that sound fantastic across a broad price point. Class D is remarkable.
Pros: Small, powerful, well-equipped options, clear installation instructions
Cons: It sort of doesnt really fit when mounted to the back of a head unit because the wires stick out of the sides and unless you modify the install kit, heck that, that mount it with zip ties in the dash and you're off and running.
3 of 4 found this helpful
Support help
Crutchfield customer from Fresno, CA on 6/1/2021
Easy to install. Support team very helpful. Will buy again
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0 of 1 found this helpful
Wow
Crutchfield customer from Rosemead, CA on 2/1/2021
2019 Mitsubishi Outlander
0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Virginia Beach, VA on 1/25/2021
1955 Chevrolet Series 2
A whole lot of sound in a tiny package. Works great and fits well hidden under the dash of my classic.
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0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Reno, NV on 1/18/2021
2009 Dodge Ram 1500
Super easy install and great upgrade over stock!
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0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Orcutt, CA on 1/10/2021
2003 Volkswagen GTI
Great little amp to power my speakers. It was easy to find a space to house this thing and was a breeze to install.
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0 of 1 found this helpful
Not a purchase I'm proud of
Sterling from Lavon, TX on 1/1/2021
1994 Ford F Series
Disappointed. For 3/5 the price, I expected more than half the bang of the Fosgate mini. I suppose I just had higher expectations. The use of a dip switch to code the amp settings made me nauseous. On the bright side, it powers the speakers and improved the sound. It tucked nicely into the dash. Rather than the wiring being ported through the bottom of the unit, the side ported in and out and optional mounts provided made it more simple to place and install with a neat look.
Pros: Slim, sleek, simple to install
Cons: The sound wasn't very impressive. The use of a dip switch as a means of tuning literally made me physically ill.
2 of 13 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Okeechobee, FL on 12/27/2020
2019 Jeep Wrangler Unlimited
1 of 4 found this helpful
Punches above its weight
Patrick from LITTLETON, CO on 12/27/2020
2014 Subaru Impreza
Great power in a tight package. Don't expect to rattle the windows with this thing, but for a small, insulated cabin this is the perfect boost to a factory head unit. I paired the Power Pack with a pair of component front speakers and composite rear with a self-powered under-seat sub. I got a hiss in the tweeters and dialed the amp gain back to 50% to compensate. 1. Easy installation - wiring is straight-forward, it's small enough to fit in the dash with the head unit 2. Run dedicated power - yes you can tap into the power for the head unit (with a caveat of 15A minimum), but its safer to run a line to the battery. 3. Extras are nice - I love the ability to tweak the roll-off, the through-line for the 12v signal is a bonus
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0 of 0 found this helpful
Great companion for a factory stereo
Crutchfield customer from Fairfax, VA on 11/23/2020
Installed on my 2018 Hyundai Elantra GT factory system with upgraded JBL Concert series coaxials and JBL Club series tweeters in the dash corners. It drives them well. Very clean and clear (as low as 0.03% THD at normal volume and only 1% after that). It has a few key features that I sought for factory system comparability: - speaker-level inputs - auto speaker level signal detection and amp turn-on - low power requirement (15 amp fuse, 12 ga power wire) - lower heat output than most amps. My only wish is that it had a separate speaker-level input harness with wires as long as the output harness (like Sony's mini amp does). After connecting 32 wires at the radio, I was not excited about connecting another 16 at the RCA leads of the amp! [I hope audio manufacturers will become aware of this unwanted extra step as more people opt to keep their new car's factory stereo instead of replacing it with an RCA output aftermarket unit.] But it was totally worth the extra work. Even my wife and daughter appreciate the difference.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Franklin, TN on 11/23/2020
2014 Jeep Wrangler Unlimited
Super easy installation and packs a powerful punch. Received it on time from Crutchfield.
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0 of 1 found this helpful
Tiny sized amp with good power and easy install with factory radio.
Crutchfield customer from Lafayette, CO on 10/11/2020
2016 Mercedes-Benz Metris
Great amp! Good power to drive my four 6.5" component speakers and small size makes it easy to hide in tight spaces. Great sound and low noise paired with my factory head unit. Crutchfield install video made it easy to hook up to my factory head unit.
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0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from De Pere, WI on 9/23/2020
Sounds exactly like the factory amp
Pros: Very compact
Cons: Too big to fit in the dash of a 2002 Avalanche
0 of 2 found this helpful
Alpine KTP-445U Power Pack
Siarhei from Mineral, VA on 9/21/2020
2008 Subaru Legacy
Great product, works good, small enough to fit under dash.
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Kannapolis, NC on 9/4/2020
2005 Jeep Wrangler Unlimited
Just what I needed to boost the small aftermarket dash and sound bar speakers in the Jeep. Sounds good, easy to wire up and hide amp under the dash. Don't forget to buy 2 sets of rca cables to connect to your aftermarket radio like I did. Had to get them at a local shop.
Pros: Compact
Cons: None imo
1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Knoxville, TN on 8/31/2020
2015 Honda Accord
This is the first upgrade an my 2015 Honda Accord. With all the connectors it was a very easy install. Oh, and the sound is AWESOME. Thank you Trevor at Crutchfield.
Pros: Very east to install
Cons: None, so far
1 of 2 found this helpful
Perfect Match
Crutchfield customer from Rockport, ME on 7/30/2020
I have yet to install the Alpine Amp. HOWEVER, from all the reviews outside of Crutchfield, the Crutchfield advisors set me in the proper direction in this purchase. I am confident that the Alpine KTP-445U Power Pack, that once installed with the Blaupunkt Bremen radio head unit will exceed my expectations.
Pros: Small and Powerful
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0 of 10 found this helpful
Factory Sound system Overhaul
Crutchfield customer from Raleigh, NC on 7/29/2020
I have a 2016 Ford Explorer and wanted to revamp my factory system so I gave Crutchfield a call and worked with Q. Q was able to give me suggestions and price points that fit into my budget. He was very helpful and really added value to my overall experience since this was my first time working with Crutchfield and doing this kind of overhaul. I will definitely be buying from them again in the future! Jeff Raleigh
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0 of 1 found this helpful
Perfect Set up for my Tundra
Jeffrey from WINTERVILLE, NC on 7/6/2020
2017 Toyota Tundra
So far so good. Sounds is good and it still has reserved power.
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2 of 2 found this helpful
Alpine KTP-445U Power Pack
Chris from CLOVIS, CA on 6/13/2020
2017 Toyota RAV4
Installed on a 2017 RAV4. Everything connected and installed just as advertised. Only draw back was the color of wires don't match. I called tech support and they emailed me a proper wiring diagram. The tech support was very aware that the wires wouldn't match. If they know this, why not send a vehicle specific diagram when someone orders this amp?The stock head unit now has a ton of power to feed our aftermarket JBL speakers. It has a punch that the car has never had before. The sound is incredible. Took about 3 hours to get everything buttoned up and placed just right. Found a place behind the Hvac controls to hide the amp. Would recommend if you aren't afraid of cutting your stock wiring and have a moderate understanding of stereo installation.
Pros: Ton of power in a small package
Cons: The color of the wires don't match. I had to call tech support. Why not just provide a wiring diagram with the instructions if you know they aren't going to match?
3 of 4 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Cape Coral, FL on 6/11/2020
2006 Ford F-150
I have other Alpine products and I have to say this unit is very small and sounds great. I am by far not an audiophile, I just know what I think sounds good and this does the job that aftermarket head units with built in amps always seem to lack regardless of price point. Just took a star from them for a lackluster attempt at an install guide "6" is mislabeled as "9" and the two blue and white wires are explained but I did have to double check. Alpine does this for a living...bad docs = bad installs. They are fully aware we are a hazard to ourselves and have staff to make sure that risk is minimized,
Pros: Sounds great and unit can be tucked anywhere. Pros if you buy it from Crutchfield they fully support you and guide you along...Well done!!
Cons: Install doc needs to be reworked and idiot proofed. This is why I buy from Crutchfield ...I called and they answered every question I had (pleasantly I might add)
4 of 4 found this helpful
Intimdating to install but really cranks out power in my Jeep Wrangler
Crutchfield customer from Thousand Oaks, CA on 6/10/2020
2013 Jeep Wrangler
I installed this in a 2013 Jeep Wrangler JK with an aftermarket JVC marine head unit. I was really intimidated by the maze of wiring coming out of the back of the head unit. The steering wheel controls added to the mess. Thanks to the crutchfield installation video I figured it out. Fortunately on the Wrangler I was able to slide the amp between the head unit and glove box- an easy, perfect fit. I bought this amp for driving around with the doors and windows off. It does the job. Really cranks out the tunes! I didn't run an amp to the stock subwoofer. With this amp the bass coming out of the dash and soundbar speakers is more than enough (aftermarket speakers in both-plk db 652.) Sounds a thousand times better than the OEM system. Also note than you won't need a wiring kit to install it in a wrangler- just wire it into the head unit power and ground wires.
Pros: sounds great - plenty of volume and bass perfect fit in a jeep wrangler
Cons: Wiring is intimidating on a jeep with steering wheel audio controls.
1 of 1 found this helpful
Alpine KTP-445U Power Pack
Guest from Gilbert, AZ on 6/5/2020
2005 Scion xA
Great little amp to add that extra power needed to get the most out of upgraded speakers. Adds just enough power to keep the door speakers from being drown out by a 10" subwoofer powered at 4 ohms/450 watts RMS. Very easy to install and can fit in many locations under or behind the dash. I mounted mine behind the glove box so it's hidden and out of the way, but still easy enough to get to if I need to ever adjust the gain or HPF settings.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Glenpool, OK on 6/1/2020
2011 GMC Sierra
I imagine this is a 5 star product. I'm only giving it 3 hear because I failed to understand up front I would need a wiring adapter to figure out the wiring. Nothing matched up color wise and after cutting some wires needlessly and scratching my head a bunch it occurred to me that I hadn't really thought this through at all. I installed some focal speakers last year and they were not performing up to their potential with the OEM head unit. The amp would have warmed the speakers up nicely I'm sure, but I would still be using that 2011 head. Decided to RMA this and purchase new head unit and am SO SO happy I did. The Alpine amp look and feels legit. Can't speak to sound quality as I didn't get that far with it.
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0 of 14 found this helpful
Good buy!
Crutchfield customer from Fort Gibson, OK on 5/26/2020
Going into this purchase I knew the installation was going to be ...uh, involved. Into a '13 F-150 it went. The dash came out easier than I thought and with Crutchfield's support with the stock radios input/output pinout diagram that was emailed to me, it was straight forward and not at all difficult. So much so that I dug into the dash twice as I had the gain at 9 o'clock instead of 3 o'clock... as it plainly says on the instructions. I set gain at 2'oclock and buttoned everything up. Once I dialed in the stock radios bass, mid and highs the sound is punchy, crisp and clear. Just what was looking for.
Pros: Simple installation . Relatively inexpensive addition that sounds better than I expected.
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2 of 2 found this helpful
Perfect amp if you just need to pump more power into a factory system.
Crutchfield customer from Lake Dallas, TX on 5/26/2020
2018 Jeep Wrangler (JL)
The KTP-445U Power Pack was perfect for my needs. Installed in a 2018 Jeep Wrangler JL to drive the dash, knee panel, and soundbar speakers (I had previously upgraded those speaker), and it does the job perfectly. Since the Jeep has a 20A circuit for the stock head unit, I didn't even need to run a power wire to the battery (per Alpine, you can just tie into the power feed of your head unit). The small size allowed me to mount the amp in the glovebox compartment (it's mounted inside the dash above the glovebox), and now I can get enough volume to enjoy music when I'm driving with the doors and top removed. Completely happy with this product!
Pros: Low power requirement, small size, adjustible gains, ease of connection
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2 of 2 found this helpful
Big things come in small packages
Crutchfield customer from Fort Wayne, IN on 5/20/2020
Great product! Very easy installation, and with its slim design, it fits easily within my dash. A+++
Pros: The small size of the amp makes it easy to hide inside your dash, but it still delivers big sound!
Cons: Yet to find one.
0 of 1 found this helpful
great amp
Crutchfield customer from Columbia, SC on 4/29/2020
Very surprising little amp. In the C6 Z06 Corvette, it installs perfectly where the factory amp is in the non-Bose system. Using it to drive 4 kicker speakers in the doors and rear. no sub.
Pros: Plenty of power
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0 of 0 found this helpful
2019 Ford ranger
Crutchfield customer from San Antonio, TX on 4/27/2020
2019 Ford Ranger
This is a great option to boost aftermarket speakers with a stock radio and have be very impressed
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0 of 0 found this helpful
Small amplifier with a great boost.
Miguel from JACKSONVILLE, NC on 3/23/2020
This compact amp gave my factory radio the boost it needed. I upgraded the speakers and the sound has significantly improved. By follwoing the instructions, it was a fairly simple install. I did run into a couple of issues that the techs at Cruthfield quickly helped me resolve, specifically assisting me in correcting the gain to reduce the static that initially was coming from my radio. One thing I love about this amp is that it senses the sound and immediatey turns on and eventually shuts down without havig to add additional on and off wiring. This is what makes purchasing an item through Cruthfield a great experience.
Pros: Compact, easy to install,
Cons: None from my point of view.
2 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Tucson, AZ on 3/19/2020
Powerful and simple to use, especially with a premade wiring harness made for your vehicle. Highly recommend if you are just powering door speakers and don't want to fuss with a lot of wiring.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from San Antonio, TX on 3/8/2020
Small size, big sound, small$$. Very happy, fits under glovebox.
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0 of 0 found this helpful
Alpine KTP-445U amplifier......it's a lil beast
Crutchfield customer from Collins, OH on 3/2/2020
Out of the $1000 I spent on Polk speakers,alpine amplifier,pioneer avh-w4500nex radio, speaker wire, brandmotion backup camera,etc. This lil amplifier I feel is the best money I spent out of all the $1000+ I have wrapped up in this stereo upgrade.
Pros: Where do I start, everything is awesome in this lil setup.....
Cons: Not a darn one
0 of 0 found this helpful
Great amp but double check DIP switches!
Mat from Everett, WA on 2/26/2020
Great amp but double check the DIP switches! I accidentally set the high pass to 120hz... See attached for ambiguous switch diagram printed on the amp itself.
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4 of 5 found this helpful
Absolutely love this high tech amp!
Lawren from CLEARWATER on 2/12/2020
Absolutely love this amp! I installed this in my 2002 4runner and the speakers have so much power. But the best part is the fact that this has a built in High pass filter! Filters all the bass frequencies and makes it so the speakers are clear and don't rattle the door panels. I also have a subwoofer on a separate amp and use that for all the bass frequencies. The sound is superb, I really can't be happier! Thanks Crutchfield!
Pros: Small, well built, great power, built in high pass filter
Cons: None
1 of 1 found this helpful
Awesome for a stock radio boost!
Crutchfield customer from Temecula, CA on 2/10/2020
I installed this in my 2016 Tacoma, splicing the wires from the power pack to two Metra harnesses to do a direct plug and play application. Since my stock Entune radio is 20A, I could wire directly into the ground and 12v on the harness and did not have to run a line to the battery or ground to the chassis. At first it did not sound right, and was really sensitive. But I had neglected to set the dip switches on the power pack. Once I set the front and rear HPF switches to 60hz and to speaker input (not RCA), it worked perfectly (I'm not sure if those are the correct settings for my application, but it seems to have worked). I'm still finding the sweet spot with the gain settings but such an improvement in sound!! The only downside is I wish the wires were longer because there is not a lot of room behind my speaker to stash this, plus I have to remove my radio every time I want to adjust the gains. For reference, I have the stock radio, but have Rockford Fosgate door speakers that really needed the boost so I could get their full potential, and this mini-amp did the trick, wow!
Pros: Easy install, small size makes it easy to stow behind the radio, made my RF speakers sound amazing!
Cons: Wish the harnesses were longer to give more options of where to stash it.
4 of 4 found this helpful
The right size.
Crutchfield customer from Alabaster, AL on 12/23/2019
The size is perfect and the power is the right amount for my C6. I was able to place it where the old Bose amp was. Passenger foot well. Highly recommend.
Pros: Power and size. Able to place anywhere.
Cons: Power light indicator would be nice to have.
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Hawaii on 12/6/2019
Tacoma, Focal components front, Focal Coax rear, stock head unit. Huge improvement over stock speakers. Excellent clarity with improved bass and highs. Great for the price, size and RMS output. I also used Metra 70-1761 and 71-1761 to eliminate the need to splice the factory harness. Shipping was fast, Crutchfield staff was very helpful and patient including the technical staff.
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3 of 3 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from San Jose, CA on 11/25/2019
Literally the best bang for your buck in terms of quality and power. The Alpine quality and ease of install plus this little guy packs such a punch and fits anywhere!!
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Quincy, MA on 11/17/2019
0 of 0 found this helpful
Tiny - but packs a punch
Edmund from Philadelphia, PA on 10/23/2019
Technology has come a long way since I got in this game (via Crutchfield!) in the early 1980s. Class D topology curtesy of modern switching power supplies means high power levels and low current draw due to massive efficiency. The days of "where do I hide all these amps" are (thankfully) gone. Look, this isn't gonna win that "audio sound off competition", but it makes no claim to - instead this can be hidden in the dash or if you have to, under a seat, and deliver enough power to rock out most "daily driver" type cars. I was able to ditch a rack of old skool Sony XM MOSFET amps and intend tuck this under the seat and clean up my install! Thanks Alpine and Crutchfield!
Pros: Small Did I say it was small?
Cons: "only" 45watts x 4
0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Laveen, AZ on 10/21/2019
This went into a 2014 Jeep Wrangler Sport. Nice and compact. No AMP kit needed for my model Jeep. This is powering 2 sets of Alpine SPV-65X-WRA speakers.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Minco, OK on 9/23/2019
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Chesapeake, VA on 9/16/2019
Its small but definitely packs some power. However, it really boosts highs and mids better than lows.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Cary, NC on 8/25/2019
Gives a big step up from the OEM amp to power upgraded speakers. Easily adjustable tuning options allow for adjusting front and rear.
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1 of 1 found this helpful
I'm happy
Crutchfield customer from Greensboro, NC on 8/5/2019
0 of 2 found this helpful
Great Little Amp But Not as Great as sale price
Eric from Toano, VA on 7/14/2019
This Alpine delivers a respectable amount of clean power from a small package and relatively little power usage. This is my second 445U and both have performed well. Why 4 stars and not 5? It's mostly the price; it used to be $40 cheaper. At that price this amp would get five stars. Changing settings require removal of a window on the underside to access tiny Dip switches. These should be on the side (like the Kicker Key180) so they can be changed without complete amp removal. Also the 12 dB/octave hi-pass filters should be a more aggressive 18 or 24 dB/octave (the Kicker Key 180.4 is 24) to provide better protection for full range speakers.. Still, I would recommend this amp if the digital processing aspects of the Key 180.4 aren't needed; otherwise the Kicker is well worth the extra $10 (I've tried both in my car now). Can't tell the difference in S/N ratio between the two (75 v. 82, both are mediocre on this spec but I have no complaints).
Pros: Small, clean, low amp draw, bridegable for future expansion.
Cons: Costs about 30% more than it did a year ago. Dip switches inaccessible once amp is installed.
5 of 5 found this helpful
Good amp
Robert from Mentor, OH on 6/16/2019
Great little amp just not very easy to install in the dash with big hands.
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0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Auburn, WA on 6/4/2019
A great amp that can be installed in small places; which is why I purchased it. Nice price point, too. Powering 4 Rockford Fosgate Prime 3-ways. Sound is great. 100% better than the stock amp.
Pros: Fits in small places. Nice power. Good price.
Cons: None
3 of 3 found this helpful
Alpine KTP-445U Power Pack
Chris from Long Island, NY on 6/4/2019
I decided to try this out for its form factor & it being an Alpine device. This amp was a total disappointment... I am running a 2018 kenwood dvd/nav head-unit & feeding the pre-amp inputs of the amp. Utilizing cal'd 0dB test-tones & a variety of music to set the gain (audio source - USB). I struggled trying to tune this amp for days but found that the clipping point occurs early and often, detracting from the listening experience and turning down the amp gain to avoid this you're not much better than a good aftermarket head-unit's on-board amp. I looked but couldn't find any Amp Dyno evals on this unit but after the install I decided to do some calculations... Doing the simple math, using ohm's law - it can't make what they claim - "45w x 4ch @ 4ohm" = 180w @ 13.5v (DC input pwr not AC output audio signal), this would require 13.3amps - but the integrated fuse is only 15a - while class D amps are much more efficient than A/B amps, they are not 100% efficient - at best they are 80% - which would mean at the rated output they would need 16amps - fuses generally need to be rated for 20% over the peak expected draw - this would dictate that the minimum fuse size should be 20amps to deliver the rated output. If you're looking for a quality class D amp in a similar form-factor - consider the JL Audio MX280/4 (50x4 @4ohms). Amp Dyno Testing I found showed output power is closer to 70x4 @ 4ohms. I swapped out the Alpine for the JL amp
Pros: Form Factor Installation Simplicity Line In & Speaker Level Input Options Long Wiring Leads
Cons: Sub-Par Output Power Over-rated output power in real world use Minimal improvement over aftermarket head-unit speaker outputs Pre-amp inputs used for this installation
8 of 15 found this helpful
Small and powerful
Crutchfield customer from Angier, NC on 6/2/2019
Very compact and great sound combination. Easy installation
Pros: Easy installation, small size, and great sound
Cons: The adjustment switches are a bit too small and hard to move
2 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Spokane, WA on 5/30/2019
Fantastic little amp that fits up under the dash. Perfect for cars with a built in touch screen system!
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0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Galveston, TX on 5/29/2019
1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Frankfort, KY on 5/5/2019
Can't be any happier with this little amp! Big bump to the factory head unit/door/rear deck speakers which in return gives your sub a big bump also!
Pros: Big sound from a small amp.
Cons: Get some hissing from your speakers around 10 or 11 o'clock on the gain. Just turn it down s tad and hissing is very minimal.
1 of 1 found this helpful
Nick
Crutchfield customer from Wichita, KS on 4/28/2019
Everything the vehical needed for sound and in a small area. Great quality sound.
Pros: Price, space savings. Powerful little punch
Cons: None
1 of 1 found this helpful
Big sound, small package
Crutchfield customer from Hillsborough, NC on 4/15/2019
This amp has quite a bit of punch especially for its size. Even though I was unable to mount this behind the dash, I was able to extend the cabling and mount it under a seat. If you want to add some clarity of sound and volume without having to do a full amp install, this is definitely the way to go.
Pros: compact, no need for an independant power and ground connection.
Cons: None so far.
1 of 1 found this helpful
Great power and boost. Honda 2016 cr v
Karyn from VAN NUYS on 4/14/2019
The people at Crutchfield very helpful. They really did their homework. I hooked up this amp and was very pleased with the power and performance with my stock speakers. Fit easily behind and under my radio head unit.
Pros: Exactly what I wanted. Excellent power. Nice compact size fit easily in my Dash
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0 of 0 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Chinle, AZ on 4/7/2019
This Lila amp rocks.....got it running my JBL speakers, with a kenwood dpx793bh deck.. All combined . Got a good marriage in my 2007 GXP Grand Prix.. Now she not only sounds good,she's one faster moving Car...
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Huntington, NY on 4/4/2019
Easy installation nice and small great sound
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0 of 0 found this helpful
Easy install
Crutchfield customer from Lithia, FL on 3/20/2019
Very slim and easy to fit in the dash near the radio. I wish the input wires were a little longer, but I was able to make it work.
Pros: Small form factor
Cons: Input wires for audio from the head unit could have been a bit longer. It made the work for someone with big hands a little tougher.
1 of 1 found this helpful
Alpine KTP-445U Power Pack
Robert from Okemos, MI on 3/18/2019
I thought this would fit up under the dash but it didn't so I installed it on an ABS plate under the passenger seat. I'm not impressed with the build quality of the Alpine amp. To install the mounting bracket you have to remove four of the case screws. These screws are cheap, soft, and apparently attached with thread locker. The torque required to remove them is more than the shear strength of the cheap things. I got three of them off, barely, the fourth was impossible to remove using a Philips head. I used a pair of pliers, then I replaced all of them with stronger screws. It's a stupid design. The bracket should have been an integral part of the casing. The connectors are cheap and fragile. The amp had been installed for a couple of days when I noticed the left rear channel was not working. There's no easy way to check continuity because of the connector. I removed the passenger seat, the connector, and the left rear door panel. Continuity was good. That was frustrating. I eventually reconnected the connector and jiggled it. The channel came back intermittently. I removed the harness, Crutchfield sent a replacement, and the new harness worked. Wasted three hours. As for the sound, it's definitely louder and more dynamic but the quality of the sound is not significantly better than my aftermarket Sony head unit. I should have spent a bit more money and gotten a better amp since this one didn't fit behind the dash anyway.
Pros: Small, relatively cheap.
Cons: Poor bracket design, flimsy connectors.
2 of 4 found this helpful
Nice little boost
David from Roswell, GA on 3/6/2019
Great little amp for adding to a factory head unit to add that little extra bump in power. It wired up easily and fit nicely behind the dash.
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0 of 0 found this helpful
Alpine KTP-445U Power Pack
Juan from Cheney on 2/28/2019
This power bar improved my sound significantly. It wasn't easy to install it behind my factory head unit to my Crosstrek, but I managed to fit it in, especially with all the extra wiring. Easy install!
Pros: Great way to really boost up your aftermarket sound.
Cons: May be a little bulky when trying to fit behind the head unit.
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Juan D from Beavercreek, OH on 2/28/2019
This power bar improved my sound significantly. It wasn't easy to install it behind my factory head unit to my Crosstrek, but I managed to fit it in, especially with all the extra wiring. Easy install!
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0 of 0 found this helpful
Perfect for my needs
Crutchfield customer from Slidell, LA on 1/21/2019
Installed this little amp in a 2018 Silverado. It is pushing JBL club 6x9 components in the front and 6.5 rear. They sound great and am very impressed for the size. I have the gains all the way down and used the Crutchfield amp kit to run power straight from the battery. (I am using an Axxes AX-DSP to interface between the factory head unit and amp. This allows me to have low level outputs and control the chime volume that could otherwise be an issue on this vehicle. It also has a crossover and EQ along with time delay for imaging all in one DSP unit). I made sure to use a reliable chassis ground and have no issues with engine noise or otherwise.
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0 of 0 found this helpful
Alpine KTP-445U Power Pack
Nick from New Providence, NJ on 1/20/2019
Bought unit installed it . 6mo in I thought I blew a speaker I swapped out speaker time went by but it was within the year , when I finally swapped the speaker out I realized it was the amp channel out , sent in to alpine out of warrant , ok they sent me back the amp now it dosnt work at all . On my daughters eyes I'm not lying or embellishing . At least it worked 3/4 of the time now nothing . No more alpine this is a sealed unit cant be fixed stay away
Pros: None
Cons: Poor quality and cust svc alpine cust service didn't want to hear it . Wanted to charge me to diagnose and ship back to me my own equip , waved sent back not working at all insult to injury. I'll document this time can't slack I live in northeast nice days are hard to come by then your warranty is up and alpine breaks your stuff
3 of 11 found this helpful
Alpine KTP-445U Power Pack
Travis from Fuquay Varina, NC on 1/13/2019
This little AMP made my wife's jeep HU sound great with adding the JBL600C in both the front and the back. The amp was easy to install and figure out. Installed with Metra adapters to not have to cut cables. This is a great AMP for the price.
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1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Trinidad, CA on 1/8/2019
Ive had the unit in for about 2 weeks. Easy to install and the sound quality is great! Perfect for small space areas! Easy install!
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0 of 1 found this helpful
Easy
Charles from Tallahassee, FL on 12/24/2018
Easy install, greatly improved sound quality and volume on factory head unit.
Pros: Easy install
Cons:
0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Marion, AL on 12/8/2018
Good product and sounds even better . Well worth the money
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0 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Catlin, IL on 11/28/2018
I had this installed for me. I noticed a huge difference to my stock reciever. The car it was installed in was a 2014 Ford escape se
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Mapleton, UT on 11/16/2018
0 of 1 found this helpful
Brought my sound, and speakers alive!!!
Colin from Fullerton, CA on 10/31/2018
I have a 97 Suzuki sidekick, with some kicker speakers in it, I was unsure, a full size amp in a tiny car, or a mini amp, Crutchfield, talked with me, and recommended this unit for what I need, it could not have been any more perfect, the right amount of power, it really does sit behind the dash behind the head unit, out of the way, they recommended all I need to complete the installation, which was a really simple job. The dual bias trim for front and rear speakers, is perfect to set the balance without using the head unit, as the rear speakers are bigger than the front. This did make my 4 inch and 5 1/4 speakers sound alive, and punchy.
Pros: Dual Bias, Easy to set up, easy to hide, no need for a newer head unit.
Cons: none, for me it was perfect, and its Alpine.
1 of 4 found this helpful
Nice addition to factory head unit
HarryBigD from Texas on 10/21/2018
I bought this amp for my 2017 Prius factory head unit. I had it professionally installed and I am very happy with the results. The sound is super clean and clear. There is complete silence between tracks. It powers four Morel Maximo's in the front and rear doors, with two Kicker 44ksc3504 in the dash. It sounds great and is plenty load enough when the windows are down on a nice day. I highly recommend this because of its size, clean signal and lack of any discernible hiss or distortion.
Pros: Compact clean sound. Compatible with a factory head unit. High pass filter for tweaking your bass.
Cons: None. Perfect for what I need.
5 of 6 found this helpful
Alpine KTP-445U Power Pack
Terence from Buffalo, NY on 10/9/2018
I installed this amp in my wifes 2018 Honda CR-V; prior to that I installed Rockford Fosgate Punch front and rear door speakers. As much as were paying for this vehicle and all the upgrades; really shocked the stereo was that bad. Only took about an hour to install the amp. The hardest part was searching the internet and emailing Honda for the wiring diagram. I could not find the diagram anywhere on net and Honda waited 10days to reply to my email only to tell me that they dont know and I should contact my dealer. I am very disappointed in that response. Service tech at Crutchfield found the wiring diagram and I know it wasnt easy for him to find it. I was on hold for 10-15mins but I didnt care because I needed the diagram and wasnt calling my local dealer. LoL. Another terrific product from an outstanding company!!!
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6 of 6 found this helpful
Great little amp
Stan from Wake Forest, NC on 9/29/2018
This is a great little amp. I installed a set of Alpine SPV-65X-WRA 6-1/2" weatherproof component speakers all the way around in my 2017 Jeep Wrangler Unlimited, and while they sounded much better than the base OEM speakers, there simply wasn't enough clean power to drive them with the front panels off and the windows down. I simply wasn't getting the full benefit which I expected with the components. This little unit tucked perfectly in the dash just to the left behind the glove box door, and now I've got as much power as I need to not only hear but actually "experience" the music during the "open air driving months". I kept my original head unit, and the wiring is super-clean; it's really nice not to have to run separate power, ground, etc. wires. For the price, this is almost a "must" if you've invested in decent aftermarket speakers.
Pros: Great price point Simple, clean installation Enough power to enjoy music with windows down
Cons: None, unless maybe you count that I can now easily recognize the lower original recording quality on the "80s on 8" satellite radio chanel... :(
7 of 7 found this helpful
Alpine KTP-445U
Mark from Redding, CA on 9/13/2018
Great little amp with good power that makes my infinity speakers sound awesome. Easy install and thank you Crutchfield
Pros: Easy install with good power and small enough to place behind receiver in dash.
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2 of 3 found this helpful
Just what the doctor ordered
Ken from Marlborough, CT on 8/21/2018
0 of 1 found this helpful
Made a HUGE difference
Crutchfield customer from Benicia, CA on 8/12/2018
This bad boi made a huge difference to the alpine type r s65 coaxial speakers I put in my smart 451. After swapping the speakers, I was pretty disappointed by how they sounded powered off the head unit. This amp (bridged to 2 channels) really woke them up! I velcro'd It under the dash so it's hidden, but i can still adjust it if needed. Also wired it to the battery with the small amp kit from Crutchfield, since the battery was under the passenger seat and easily accessible.
Pros: -Easy to install -Lots of power for two channels -Doesn't need it's own power -Extremely small compared to similar amps
Cons: None for the price- it is a simple amp that does one thing well but doesn't have bells or whistles
0 of 0 found this helpful
Nice sound and easy install
Guest from Chester, VA on 8/5/2018
I bought this from our local big box electronics store... but purchased speakers and Powered Subwoofer from Crutchfield as a Charlottesville Store walk-in. I found the installation easy. The biggest time consumer was taking the Amp harness, receiver harness and car harness side... and putting it all together (I chose to solder and heat-shrink & I also used line level converters so I could use the RCA inputs at the amp). I ran the pass through remote turnon to the powered Sub. KTP-445U went behind my radio in the dash, so I have to make sure I set the gains and filters correctly before tucking it away. My cars OEM radio power circuit was a 15A circuit and have had zero issues using to power the 445U. 6-1/2" 3-way Rockford Speakers with Crutchfield provided factory pigtails and brackets in all 4 doors made install easy, and the house brand 10AWG amp kit for the powered Sub was good quality and had everything I needed.
Pros: Size, Sound and ease of intall
Cons: nothing if you know what to expect from it.
2 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Enfield, CT on 7/8/2018
Improved the sound quality and clarity while keeping factory system with upgrades Infinity speakers
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Trenton, IL on 6/24/2018
Very small and compact. It fits behind the radio in the dash. Powers 4-51/4 alpine type s. Have them all installed in a jeep and with the top off o can still hear the music crystal clear at highway speeds
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1 of 2 found this helpful
Alpine amp
Ralph from Sebastian, FL on 6/15/2018
Great little amp. Installed it to the stock head unit of a 2014 Silverado. Also installed new kicker components. The amp made a big difference. The kickers sound crystal clear with no distortion. The alpine fit perfect behind the head unit. Very happy
Pros: Easy install. Sounds awesome
Cons: None
4 of 4 found this helpful
Exactly what I needed!
Alan from Richmond, VA on 6/4/2018
Installation was straight forward. I was concerned that it may not fit in my dash but I was pleasantly surprised it fit without issue.
Pros: small plenty of punch for two pairs of speakers
Cons: none
0 of 0 found this helpful
Alpine KTP-445U Power Pack
Andrew from West river, MD on 4/27/2018
I could not be happier. I was apprehensive about adding an amp. I was into loud stereos when I was younger and remember wires everywhere and never having trunk space. Not the case with this little beast. Clear, crisp sound, coming from all my speakers. From Beethoven to Metallica, this thing handles it all. Wish I'd found it sooner, and hunter was a great help at showing me what I needed.
Pros: Awesome sound. Minimal installation time. Compact size that hides behind the dash.
Cons: None.
3 of 3 found this helpful
Worth it's weight..
Rufus J. from NW/IN on 4/4/2018
This amp surpassed expectations, it really brought to life my front & rear 6.5's. It was a easy hookup & it fit right underneath the head unit. I did run a dedicated power wire to the battery as instructed by Crutchfield but to be honest, I think I could have used the factory harness because of the near proximity of the amp to the harness. The sound of my highs & mids are so much clearer, my single 12in sealed sub blends in well & doesn't completely overpower the 6.5's.
Pros: Small form factor, big sound.
Cons: Just make sure you adjust your gain levels before you tuck it away, not really a con but a pain to do it it's under the head unit or behind it.
3 of 3 found this helpful
Alpine KTP-445U Power Pack
Michael from Antioch on 4/3/2018
loved helped make all the other good stuff sound great
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2 of 2 found this helpful
Great little amp
Dana from Sioux Falls, SD on 3/30/2018
Purchased the amp for my motorcycle. The old one died and I needed a replacement. I have the other model KTP 445A and thought this would be perfect. The amp sounds really good and went in very easy. The amp fit perfectly under the deck and the sides stuck out enough so I could screw it down. The only downside about the amp is the really soft screws for the brackets. I almost thought I'd have to drill them out to get the brackets on. I can't say enough about how soft they were. Do yourself a favor, after you get them out go get some new ones. I would have given it five stars, but the screws were very hard to deal with.
Pros: Sounds awesome! Easy to install. Very small footprint.
Cons: Bracket screws are very soft.
3 of 3 found this helpful
Very good compact amp
Kevin from Roswell, GA on 3/20/2018
Upgraded head unit to JVC 430BT, but was still lacking the overall sound I was looking for driving Kicker 6504 speakers. Advisor recommended more power. The advisor was right on. I'm not looking to shatter windows; just want good, robust sound. The Alpine 445 was an excellent choice for my price conscious needs. With it's use of a wiring harness, there was a whole lot of splicing to do (perhaps the biggest drawback), but it is a great little amp. And I wanted little (although I still chose to mount it under my driver seat). It fits easily completely up under the seat and out of harms way.
Pros: Sound, ease of use, size
Cons: None
0 of 0 found this helpful
4Runner, better sound
John from Rosamond, CA on 3/17/2018
2016 4Runner. Crutchfield told me that there wasn't a harness. Buy a Male and Female 1761 from Metra or elsewhere - boom - plug and play wire harness (you'll have to connect the speaker wires of course.) The stock radio in the 4Runner is pathetic when it comes to output. I have to run the volume at almost three-quarter to get decent sound out of it. Finished installing the power pack today. This is exactly what I wanted. In 4Runner there is room inside the dash (above glove box) but the shape is so irregular that unless you wanted to wrap it in foam and shove in in the hole, I didn't think that was a good place. I installed it beneath the passenger seat. Great price, very good results. I would definitely recommend this unit. There is a very small amount of hiss when sound is not playing.
Pros: Small size, cheap to buy, easy to place in vehicle, From a well known company, has gain control and a built in cross over.
Cons: Don't know how long it'll last, a little hiss when music is not playing.
4 of 4 found this helpful
Sounds Great
David from Quanah, TX on 3/11/2018
2011 F150. Easy to install and fit under the head unit, tucked away nicely. Sounds great.
Pros: Fairly easy install. Getting to the head unit was the hardest part.
Cons: Tucked away in the dash, you can't change the gains very easily.
0 of 1 found this helpful
Alpine KTP-445U Power Pack
Fadi from Munster, IN on 3/4/2018
Great amp especially if you're just wanting to get more sound without replacing speakers or stereo. Recommended it to my brothete5and now they all one one.
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0 of 0 found this helpful
Great sound
Ash from Morgan Hill, CA on 2/8/2018
Installed this in my 1998 Toyota 4Runner. I didn't want a large 'system' and was only looking to do a modest upgrade. With fresh speakers and a new double-din HU I realized the 18rms in the HU wasn't enough and I couldn't wire in the original factory amp. Reading the awesome reviews of this little Power Pack I went for it. Fortunately it fit just nicely behind the dash. It wasn't more volume I was looking for as much as it was the power to feed the new speakers with richer and deeper sound that an amp offers. This Alpine Power Pack has not disappointed and the sound is fantastic in my Runner. It does crank more obviously but the most important aspect for me was that cleaner and richer sound quality the amp provides. As an aside comment, during my installation I utilized the free phone-in technical assistance Crutchfield offers and it was absolutely stellar all the way. Scott was amazingly friendly, polite, helpful and easy to understand. He corrected my thinking as to why the wiring was confusing me and got me on my way in very short time. A+ all around.
Pros: Easy to install. Compact and powerful.
Cons: None at this time.
2 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Santa Cruz, CA on 1/21/2018
I installed this to increase the volume of the stock head unit in my 2010 Toyota Tacoma, which didn't get very loud, especially the AUX input. It did the trick, and the stock speakers seem to handle the output fine.
Pros: Boosts the power of the stock head unit nicely.
Cons: A bit tricky to install in the vehicle, more an issue of the car than the unit, which is pretty small.
1 of 2 found this helpful
Alpine KTP-445U
Crutchfield customer from Lupton, MI on 11/14/2017
Blow my hair back?? I didn't think there was going to be that big of a difference in loudness or clarity. Everything is much better with Crutchfield and their staff. Thanks to staff like Paul.
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1 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Cool Ridge, WV on 10/27/2017
Was very surprised at the amount of power supplied by this small amp, more than enough to double the sound and quality of any factory system, highly recommend.
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1 of 1 found this helpful
Adds plenty of volume and upgrades detail!!
Dexter from Norton VA on 10/18/2017
I love this amplifier! I'm a big Jeep guy, and nothing upgrades the sound in your JK quite like this little amplifier. For the newer (non Alpine or Infinity models) Jeep Wrangler's, this amplifier is completely plug-and-play. Just pair it with an Alpine stereo and you're good to go! Drop the top or take out the roof panels, turn up the radio, and enjoy excellent quality music LOUD!
Pros: completely plug-and-play in many cars.
Cons: It could be more powerful, but that's an issue I'm always faced with.
2 of 2 found this helpful
Alpine KTP-445U Power Pack
RICHARD from Tacoma, WA on 10/11/2017
Awesome product!!! I expected nothing less from Alpine. Powers my Kicker component's for both the front and rear doors with zero distortion. sounded great with the stock speakers as well. easy wiring completely plug and play and can fit anywhere.
Pros: great power great sound compact size great price easy install
Cons: havent found one yet...
0 of 1 found this helpful
Nice amp
Steve from Morrilton, AR on 9/5/2017
Perfect amp for the Miata
Pros: Perfect fit for a in dash install. Really makes my JVC head unit sound great.
Cons: None as of yet
0 of 0 found this helpful
Review correction/update for 2015 Subaru Forester install
BFC from Seattle, WA on 8/28/2017
Last February 2016 I gave the amp a poor review because of a hum noise I was getting thru my speakers , using the oem Clarion head unit and upgraded Subaru Kicker speakers. Used speaker level connection. I've since replaced the stock head unit with a Kenwood Excelon DPX792BH bought thru Crutchfield and decided to try using the Alpine again, this time using RCA connections and the amp was powered and grounded again using the car's radio power and ground wires. No hum or any other issues so it seems the switch to a better head unit w/ rca inputs did the trick. I also followed Crutchfield's advice on using test tones to help set the gains. I wasn't expecting a huge jump in power (Kenwood head unit 22 watts/channel, Alpine 45watts/channel) but there is a bit more oomph and clarity to the sound now so any issues I had before weren't due to this Alpine amp.
Pros: Small size, relatively cool-running, uses RCA connection, good value
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8 of 9 found this helpful
Great amp
nathan from Kansas City, MO on 8/20/2017
Great little amp with lots of power.
Pros: Bought this amp to power the door speakers in my 2016 Dodge Ram 2500. Used in a previous vehicle. Sounded great and was easy to hide. Most people thought I was using a much bigger amp to power my speakers. Loved it and will suggest to anyone looking for an easy clean install amp to purchase.
Cons: When turned up it would cut out. It may have been due to heat. This was an early generation amp, I would expect Alpine to have corrected the issue over the years
2 of 2 found this helpful
Happy
James from San Antonio, TX on 8/3/2017
This little guy has way more power than advertised. Had good features, can install pretty much anywhere. Great solution if tight on space or just trying to beef up any deck.
Pros: Power, size, ease of use
Cons: None
3 of 4 found this helpful
Alpine
Sparky from Newport News Va. on 7/20/2017
Install this on my 2009 Street Glide to power to Alpine 6.5 Bridge and it's a perfect product fits in the fairing perfect.
Pros: Compact size and power when bridged
Cons: Really none for the application that I had for my motorcycle
0 of 0 found this helpful
Amazing power from a small package
James from Wappingers Falls, NY on 6/21/2017
Great power and sound from a small package. Install was a bit annoying due to the numerous and bulky wires.
Pros: Amazing power from a small package. Easy to find a space to install. Surprisingly loud given modest specs. Would buy again.
Cons: Having wiring harness on each end makes installation more difficult. Prefer to see all wires on one side for better "fitability". Simply the wiring as well.
2 of 2 found this helpful
I cant feel the difference
Don2 from Aliso Viejo on 5/8/2017
I bought mine at a local dealer. This store is in Rancho Sta Margarita in California. I purchased this to give my Pioneer Avic 5200 NEX an extra power. Honestly i cant feel the difference. I have a friend who has the same head unit and has a cheaper speaker component speaker and his sounds louder and cleaner than mine. I will have mine removed next week. It was not worth it. If you expect more power, this wont serve the purpose. Do not get this one. I am an audiophile for decades and I will go back to either Rockford Fosgate or JL audio. Alpine is not very popular with amps. Again do not buy this. I gave mine a chance but didn't satisfy me
Pros: Cheap, can be installed bahind the dash
Cons: Cant feel its presence, its just like as powerful as a head unit
7 of 45 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Blue Ridge, va on 5/8/2017
Have not connected it yet but the size was very compact. Exactly what we wanted.
Pros: Compact size
Cons:
0 of 8 found this helpful
Great sound improvement
Robert from Olympia, WA on 4/22/2017
Love the sound this little amp kicks out. It gives the speaker in my Tundra the extra boost of power to really improve the sound quality. It's size allows you to mount it just about anywhere.
Pros: Great sound, compact size
Cons: None!!!
4 of 5 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Barrigada, Guam on 4/18/2017
Powerful Amp for its size. I ended up mounting it on the driver's side kick panel for easier access for tuning the amp.
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0 of 1 found this helpful
Makes Honda CRV a pleasure to drive
dominic from Wakefield, MA on 4/16/2017
Small and compact but plenty of power for 4 JBL speakers, fit where the factory amp was, 2014 Honda CRV EX-L, Has output to turn on your subwooker if you need it.
Pros: small and compact plenty of power
Cons: input wire harness to short.
0 of 0 found this helpful
Amazing clarity
Crutchfield customer from Austin, TX on 3/26/2017
Wow what a difference in my 2017 crewmax Tundra. It really gives it an extra punch
Pros: Small and can put anywhere
Cons: Nothing
1 of 1 found this helpful
Slight power boost, and a bit of hum boost too
Anurag from Chicago, IL on 3/13/2017
As a part of my car stereo upgrade, I first went on to change the stock speakers to get a little boost to the low-ends (The mid and highs were good enough) The Polks I ordered made no difference to sound quality, so I went on and got the Alpine KTP-445U. After installation, I did not notice any boost to the lows. I then went on and replaced the Polks with the OEM speakers and that made all the difference. Contrary to what I expected, the OEM's despite their smaller magnets delivered a better punch with the Alpine power pack than with the high(er) end Polks. Overall, I am a (tad bit) more satisfied with the sound quality of my car's stereo with the Alpine KTP-445U installed. So why the 3 stars: The Alpine KTP-445U is an amplifier, and like (most) amplifiers, it will also increase noise. Not quite what I expected from an Alpine unit, but it is what it is. At low volumes, bass output is better as compared to the stock setup but at very low volumes the noise can be heard a bit, if you are my types with sharp (dog-like) ears. I got the unit installed by a pro, paid about a 100 bucks for the installation, but they did a good job at setting the gain. Check the Crutchfield Subwoofer Tuning article for some references you can use to set gain at the correct level Nevertheless, if you are looking to boost your existing setup without a sub, then the Alpine KTP-445U sure is a good way forward.
Pros: 1. Tiny little invisible unit, fits inside the dash 2. Slight boost your existing set-up, decent boost to the low-end frequencies
Cons: 1. Expect a slight hum from your speakers at low volumes, which is not noticeable at higher volumes
7 of 10 found this helpful
Alpine KTP-445U Power Pack
Adam from Las Vegas, NV on 3/12/2017
Would definatly recommend this amp if you're looking for something small that packs a decent punch
Pros: Small, good price and sound
Cons: None so far
1 of 1 found this helpful
Alpine KTP-445U Power Pack
Tom from Warwick, NY on 3/1/2017
Everyone at Crutchfield is AWESOME!! I love the sound after adding my new Alpine 4 channel amp. This was so small I was able to fit it in the dash behind the glove box, so I can easily access it for future adjustments. I installed this on my new Jeep Rubicon and what a difference!!! Thanks everyone @ Crutchfield another great job.
Pros: extremely easy install , and can pretty much hide it anywhere , very pleased with this purchase
Cons: I really don't have any !!
4 of 4 found this helpful
Keep looking...........
wyatt from Livingston, TX on 2/23/2017
Lot of noise and hiss....Lot of power, but a lot of hiss..Tried different grounding locations and every trick in the book and in the end, I switched to a Clarion brick amp...Big disappointment from such a big name...
Pros: Size
Cons: Too noisy....
10 of 13 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Tampa, FL on 1/9/2017
Overall, I am very pleased with this purchase. I am surprised that when RCA jacks cannot be used, the solution is to cut the already short wires and extend them. A non-rca harness should be included with sufficient length.
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4 of 8 found this helpful
One more please
Tom from Grant twsp, MI on 12/19/2016
This is the third ktp-445 amp I have purchased from Crutchfield, installed in boat car and truck. If your plan is simply to make significant upgrade to an existing sound system with stealth, space savings, and cost savings, you can't beat this amp. Inputs, auto turn on, adjustments, and reliability are the features I was looking for.
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4 of 4 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Huntingdon, PA on 12/13/2016
I installed this unit with the purchase of a new JVC head unit because after installing my Kicker speakers, I still didn't have clear sound. This little amp (really little) totally brought my speakers to life. I can now hear all of the instruments clearly. The best thing is that this amp is so small I was able to install it just behind the head unit without trouble!
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2 of 2 found this helpful
Alpine KTP-445U Power Pack
Jonathan c from Okanagan, wa on 12/11/2016
0 of 1 found this helpful
Works well, easy solution
Crutchfield customer from Marlboro, NJ on 11/28/2016
Definitely makes a significant difference. Driving JL C2 690tx (which were asleep with the aftermarket Pioneer HU) and JL C2 350x which were fine without an amp. Was able to fit it behind the stereo
Pros: Big difference in sound, works well powered from headunit power line. Easy solution if you don't want the hassle of installing an amp. Very happy with the sound.
Cons: Pricey for what it is, you are basically paying for convenience which is fine. The version that works with alpine headunits is cheaper
1 of 2 found this helpful
Magic in a box!
Rick from California on 11/20/2016
Love this small amplifier! I needed something to drive my JL C3s and this amp pushes them nicely! I'm used to the larger 4 channels from the past and this fit in my glove box
Pros: Small footprint yet powerful. You have to try this thing
Cons: I wish the exterior was a little fancier like the other Alpine models (LED lights)
1 of 3 found this helpful
Alpine KTP-445U Power Pack
Tim from Whittier, CA on 11/20/2016
Added to basic sound system in 2016 mustang gt it sounds really good now
Pros: Upgrades sound system fits behind dash nicely
Cons: None so far
2 of 2 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Lebanon, PA on 11/14/2016
1 of 1 found this helpful
Alpine KTP-445U Power Pack
Crutchfield customer from Harpers Ferry, WV on 11/8/2016
1 of 2 found this helpful
Makes a big difference over stock head unit with aftermarket speakers
Crutchfield customer from Columbus, OH on 11/7/2016
Brought a pair of JBL Stage 600Cs to life after the stock headunit in my 2016 HR-V couldn't cut it. I am amazed at the difference in quality and bass punch.
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2 of 3 found this helpful
Alpine KTP-445U Power Pack
Vaughn from Alpine, TX on 10/28/2016
This is a great little amp. I mounted it on the ceiling of my glove box, and the cables were long enough to make it to the head.
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0 of 3 found this helpful
Plus-Up
Brian from Dedham, MA on 9/1/2016
I bought this amp to plus-up my stock stereo system in my 2012 Subaru Impreza. The sound was better after the installation, but the factory speakers were not good enough to handle the power.
Pros: better sound
Cons: needed to buy speakers (which i was eventually going to buy later this just sped up the purchase)
3 of 4 found this helpful
Does the job!
Douglas from Raleigh, NC on 8/25/2016
This amp is part of a complete audio system I put in my 2001 Jeep Cherokee XJ. I'm using it to bump up the power to four Polk Audio db651s speakers mounted in the stock locations. I set the cutoff at 60 and am running a RF Punch P300-10 for the bass. It has its own built-in amp. The Polk Audio speakers sound great so the amp must be doing something right. It's mounted behind the Kenwood Excelon KDC-X300 in the dash. Out of sight, out of mind.
Pros: Wiring was easy. It matched up nicely to the Kenwood harness and the vehicle adapter harnesses. Just a little head scratching, but it all worked out.
Cons: Got nothing. It works for me.
3 of 4 found this helpful
Great little amp!
TerryM from Luray, VA on 7/24/2016
This little amp packs quite a punch when you're short on mounting space. Going from stock head unit to an aftermarket always ends up sounding flat and tinny. I had purchased a larger amp to address this, however my plans to mount it under a seat ultimately turned me off. I bought this unit and installation was quite simple. No running wires from the engine bay and running a ground wire to somewhere on the floor. Just need RCA cables, radio wiring kit, and crimps. 90% of the installation prep was done before opening the car door. The size of this amp is great! It fits right behind my head unit with room to spare. I definitely recommend!
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2 of 3 found this helpful
AMAZING
CP from Blackwood, NJ on 7/17/2016
This little alpine amp is Amazing! For the money and the convenience there is nothing out there that can compete. My piece of advice is use this amp bridged at 90 watts rms x 2. Using the 45 x 4 is ok for increasing clarity but will only give you a small power boost over your head unit. At 90x4 this amp comes alive and can compete with some bigger wired amps in power and clarity. I definitely recommend this amp for a small component set and it will bring it to life.
Pros: Definitive Clarity and power boost at 90w x 2.
Cons: 45 watts x 4 is just ok. I wouldn't buy this amp if I wasn't going to bridge it.
6 of 8 found this helpful
It has its pros in cons in my opinion.
audiophile from Grand Rapids, MI on 5/13/2016
This is definitely an improvement to a stock head unit. It sure does pack a punch after tapping into the stock head unit power and ground, as described in the manual. Some maybe skeptical that splicing into the head unit power will be sufficient for an amplifier but I think it supplies plenty of power. I replaced the stock speakers with JL audio C2 series and had the gain on this amplifier at nearly 20-25% and it was quite loud.
Pros: Small and fairly easy to install depending on your vehicle. Provides a good sound upgrade for a stock head unit, so you can keep the factory head unit and still have searing wheel controls with out purchasing extra hardware. Small size also makes it easier to install with the ability to mount it in the front of the vehicle without needing to run wire across the whole car.
Cons: -No power indicator light or over current light. Hard to tell when the amp is actually drawing power. -A low level line out would also be really nice. -The speaker wire with the white/brown stripe was extremely hard for me to find for some reason, it almost looks identical to the white/grey stripe.
7 of 8 found this helpful
Great amp for tight spots!
I was replacing y 2002 WJ Grand Cherokee's Infinity radio, which meant I could not use the factory amp anymore. I was going to run the speakers off the Kenwood head unit- then I found this Universal Power-pack online. I patched it into the factory amp's wiring harness under the back seat, even re-used the factory power/ground wires. I ran two sets of 11.5 foot RCA cables for my signal from the Kenwood to the amp because I wanted a nice clean signal. I already had full range 6.5 speakers in the front doors (was not using the old stock dash speakers anymore). WOW it blows away the original amp, nice clear sound with enough bass to shake my seat (jazz/blues/rock) from the four 6.5's in the doors. I can't believe I didn't have to sacrifice cargo space or run huge wiring for it! Nobody even knows it's there- perfect!
Pros: Small size, easy and clean install (re-used factory amp harness), nice clean sound
Cons: None after a year and a half
1 of 1 found this helpful
Excellent value and quality
Mjm from Honolulu, HI on 5/7/2016
I researched small amplifiers for my jeep. I just wanted little more power to my aftermarket speakers. This is the amp if you want a boost to your factory or aftermarket radio.
Pros: Color coded wired for ease of installation of you are using aftermarket radio
Cons: Non so far
2 of 2 found this helpful
Works great!! helps a weak aftermarket deck with sound output
P Brokaw from Tacoma, WA on 5/4/2016