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Alpine KTP-190U Power Pack

Compact mono subwoofer amplifier — 60 watts RMS x 1 at 2 ohms

12 Reviews | 7 questions - 14 answers

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Our take on the Alpine KTP-190U Power Pack

Alpine's KTP-190U "Power Pack" mono amplifier can power a 2-ohm sub with 60 watts RMS, yet this compact amp will fit behind most dashboards for a truly stealthy installation. The KTP-190U can also send 90 watts to a 1-ohm load safely, so it's a great choice as a replacement amp for a low-impedance factory sub. The KTP-190U will work with most non-premium factory radios and aftermarket receivers, but it's not a plug-and-play installation — you'll have to wire it into your system.

Alpine Authorized Online Dealer

Add some bass to your factory system

Alpine's KTP-190U "Power Pack" mono amplifier can power a 2-ohm sub with 60 watts RMS, yet this compact amp will fit behind most dashboards for a truly stealthy installation. The KTP-190U can also send 90 watts to a 1-ohm load safely, so it's a great choice as a replacement amp for a low-impedance factory sub. The KTP-190U will work with most non-premium factory radios and aftermarket receivers, but it's not a plug-and-play installation — you'll have to wire it into your system.

A low-pass filter helps keep your subwoofer sounding fat and full, and an optional wired remote will let you control the level from your front seat. In terms of power, the KTP-190U matches up well with most factory radios or aftermarket receivers.

Installation note: If your car receiver's power circuit is protected by a 15-amp or larger fuse (check your fuse box or owner's manual), you can tap into it to power your KTP-190U. Otherwise, you'll have to run a power wire to the battery. Be sure to add a 10-amp inline fuse as close to the battery as possible.

You can install this compact amp behind most dashboards, and can splice into your speaker wiring to get signal to the KTP-190U.

Confused about impedance? Check out our article on matching subs and amps.

Product Highlights:

  • compact mono subwoofer amplifier
  • 30 watts RMS x 1 at 4 ohms (60 watts RMS at 2 ohms)
  • 90 watts RMS x 1 at 1 ohm
  • designed for systems powered by factory radio or aftermarket receiver
  • no RCA inputs: universal harness lets you get signal from speaker-level wiring
  • runs off same power circuit as receiver (must be 15-amp or more)
  • Class D amp technology
  • built-in low-pass crossover (selectable 80, 100, 120 Hz at 12 dB/octave)
  • optional RUX-KNOB.2 wired remote level control
  • fuse: 10A
  • 12-gauge power and ground leads recommended, when necessary
  • dimensions: 5-3/8"W x 1-9/16"H x 2-5/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • Mono subwoofer amp
  • Two 10-amp ATO fuses (one installed/one spare)
  • 24" Power/Speaker harness
  • Four 1/2" Phillips/Hex-head mounting screws
  • Owner's manual (English/ French/ Spanish)
  • Warranty information
  • On-line product registration information

Decent power output pushing my 6.75 sub pulling a 1 ohm load. Easy to wire in. Great that there isn't a switch required and it shuts off on its own. Wish there were RCA preouts to to the back of my headunit for sub controls though other than the rox knob.

Tim, Wheelersburg, OH


Alpine KTP-190U Power Pack Reviews

Average Customer Review(s):

(12 Reviews)

Alpine KTP-190U Power Pack

Crutchfield customer from Tomball, TX on 2/19/2019

Crutchfield Customer Review (What's this?)

Although a lil pricy than most amps it's compact and easy to install behind the dash and just enough to power a factory subwoofer. So far so good. We'll see...



2007 Honda Pilot

Paul from Louisville, KY on 1/22/2019

Crutchfield Customer Review (What's this?)

Great little tool to retain use of the factory sub woofer in my Pilot! I'm not as much of an audiophile as I used to be and don't have the time, money, or wish to install a full amp system but wanted to still have my sub hooked up to the system. This little guy did the trick! Super easy install and fit right up behind the glove box... I honeslty don't see the need for the rux knob and didn't purchase it. I just set the built-in crossover to match my speakers' low-end and tucked it away. Only con I can think of is the lack of RCA jacks to the head unit.

Pros: Easy install, retain use of stock sub

Cons: no RCA

Simple power

Tim from Wheelersburg, OH on 2/11/2018

Crutchfield Customer Review (What's this?)

Decent power output pushing my 6.75 sub pulling a 1 ohm load. Easy to wire in. Great that there isn't a switch required and it shuts off on its own. Wish there were RCA preouts to to the back of my headunit for sub controls though other than the rox knob.



Not enough power for my factory sub

John from Ashburn, VA on 3/8/2017

Crutchfield Customer Review (What's this?)

Works okay. I wanted a low powered amp to power a factory sub in a Lexus ES after getting a new head unit. It was still underpowered (and I'm not a bass head). Left it in anyway for some fill. I keep the Rox nob on max.

Pros: Small, lightweight and inexpensive

Cons: Not Enough power

Good for a factory sub - forget Rux knob.

Joe from Long Beach, CA on 2/7/2017

Crutchfield Customer Review (What's this?)

I put this amp in my 2010 Mitsubishi Ralliart with factory Rockford Fosgate 8-channel amp and 1 ohm DVC sub, with aftermarket head unit - factory heads unit was stolen. I think its pretty much the same stereo as a lancer or Evo, 2009-Current with Rockford Fosgate sound systems. I cut the sub wires off the factory amp and ran wires to this little amp, took about 45 minutes to install. All I needed to buy was 12 feet of 14 gauge speaker wire. The stereo sounds a little better than stock. I think the Rux Knob is a waste for this- its such a small amp that you would only want it cranked all the way up - when I unplug the Rux knob, it sounds like its turned all the way up, and so the knob only lets you turn the bass down - not up with this amp (I'm sure its more relevant for bigger amps). I am pleased with this amp only because I am getting old and I split my time listing to rap and talk radio - a teenager would want more bass.

Pros: Small size, easy to install.

Cons: Low power - probably is best with very efficient 1 or 2 ohm sub. Don't get the Rux Knob (because it only lowers bass - which you will barely get enough of). Only Speaker level inputs.

Great little amp

adam from El Paso, TX on 2/3/2017

Crutchfield Customer Review (What's this?)

I used this amp to keep the factory subwoofer in a 2012 Ridgeline after swapping out the headunit to a 4200 Nex. Worked great, just not very much "authority" I know, I know we're talking about the factory subwoofer here. Now since this amp is rated to 1 ohm, I tried a little experiment. I went ahead and hooked a bazooka 6 inch four ohm passive tube I had laying around in parallel with the factory sub. Wow! I like this ALOT! The tube sits alongside the factory sub behind the rear seat on the driver's side, completely hidden, it fits! The amplifier is chugging along like a champ, no heat problems, no popping fuses. Long term, we'll see but for the time being all is well. Oh and by the way the Ridgeline has a 20 amp factory radio circuit fuse so I'm powering from there. Too easy.

Pros: Playing into a two ohm load with ease!

Cons: None so far... The extra cost knob is a must!

Alpine KTP-190U Power Pack

Crutchfield customer from San Diego, CA on 2/2/2017

Crutchfield Customer Review (What's this?)

Easy to install in my ridgeline and easy to hide anywhere. Used to power the factory sub. Make sure to buy the RUX-KNOB to add a little more oomph. Kind of low output without it.



Doesn't work

James from Naples, FL on 10/12/2016

Crutchfield Customer Review (What's this?)

2012 Jeep wrangler, factory head unit. Added stock sub/enclosure. Will not drive a 1 ohm load ( factory Alpine sub in factory enclosure) will run a 2 ohm load or higher. Tried 2 different amps, neither will run the factory sub at 1 ohm. Remove one voice coil to make a 2 ohm load and immediately the sub comes to life.....

Pros: Small

Cons: Doesn't work as specified

Crutchfield response on 10/17/2016 Once we saw this review, our Tech Support team reached out to James to issue an apology and help him further. We'll either help him get the amp working the way it should, or help him return it for an exchange or refund.

Perfect for Honda Pilot factory subwoofer

Josh W from California, MD on 6/6/2016

Crutchfield Customer Review (What's this?)

I needed this to continue to run the factory subwoofer in my 2004 Honda Pilot with the aftermarket stereo I bought. This little unit fit neatly in the deadspace above my car's glove box, making installation rather simple. As a bonus, that install location allowed me to tap into the existing power wiring for the stereo (the Pilot has a high enough amperage rating to run both the stereo and the amp on the same circuit) and easily connect the subwoofer speaker wiring to the amp. A minimally invasive install.

Pros: Small size, ease of installation

Cons: None noted

Alpine KTP amp

Harrison from Virginia on 5/5/2015

Crutchfield Customer Review (What's this?)

it isn't quite strong enough to power my sub



Great for Honda Pilot factory sub-woofer

Jeff from Meridian, ID on 4/24/2015

Crutchfield Customer Review (What's this?)

I replaced the factory stereo in a 2004 Pilot with a JVC-R860BT head unit, but wanted to enable the factory sub-woofer in the back. This unit is perfect for that application - it matches the specs of the Pilot well (2 ohm, 60 watt, single channel). I had to splice the factory connector for the sub-woofer. I also added the variable level control.

Pros: * Very small * Inexpensive



Troy A from Arkansas on 12/1/2014

Crutchfield Customer Review (What's this?)

This little power pak really helped push the speakers. We just needed a little bit more out of the new speakers and this did the trick.




Hands-on research

Product Research


CTA-2006 Compliant: The specifications given by Alpine for the amplifier comply with the CTA-2006 mobile amplifier power testing and measurement standards from the CTA (Consumer Technology Association). This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal to noise ratio, allowing consumers to compare car amplifiers and receivers under the same conditions (apples to apples).

  • Power Output:
    • 2Ω: 60 watts x 1 RMS (14.4 volts, <1% THD+N)
    • 1Ω: 90 watts x 1 RMS (14.4 volts, <1% THD+N)
  • S/N:
    • @ 1 watt: 80 dB
    • @ rated power: 98 dB
  • Frequency Response: 10-120 Hz (+0/-3 dB)
  • Damping Factor: >200 (10 watts into 4Ω at 100 Hz)
  • Input Impedance: >10 kΩ
  • Input Sensitivity:
    • into 1Ω: 5.9 volts (rated power into 1Ω)
    • into 4Ω: 5.0 volts (rated power into 4Ω)
  • This amplifier is intended to be used as factory OEM subwoofer amplifier replacement with a factory OEM low impedance 1-ohm subwoofer only.
  • Output connection is intended for a 1 ohm subwoofer (90W x 1), but will work with 2 ohm (60W x 1) and 4 ohm (30W x 1). However, power level is not enough to drive most 2 ohm or 4 ohm subwoofers.

Fixed Gain w/ Variable Crossover: The input gain on this amplifier is fixed and not adjustable. Because the KTP-190U is a subwoofer amp, the low pass crossover is always engaged. The crossover point is adjustable; choose 80, 100, or 120 Hz.

Wiring Harness: The amp's power/speaker harness has a 10-pin proprietary connector on one end that plugs into the KTP-190U, and bare wires on the other end to connect to constant power (with 10-amp fuse installed), ground, the radio's speaker level outputs (left and right channels), and the subwoofer input. The power wire can often be spliced into the radio's power source.

Note: The factory radio circuit needs to be a minimum of 15-amps. If it is not, a separate power and ground will need to be installed for the KTP-190U.

Auto Turn-on: A circuit automatically turns the amplifier on when it senses a speaker-level input signal.

Wired Remote: An RJ-14 jack is provided for connecting an optional RUX-KNOB.2 wired remote (500RUXKNOB.2, sold separately), allowing remote control of the output level of the amplifier.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Keep the use of the factory subwoofer after installing aftermarket head unit in my 2007 Honda Pilot. [ P  Jan 17, 2019 ]
It will fit as a replacement for the stock amp in my 2000 mountaineer. [ Danny  Aug 16, 2017 ]
it will power my sub appropriately [ Benjamin  May 22, 2017 ]
Needed this for factory subwoofer after upgrading my 2003 Honda Pilot to the Sony XAV-AX100 with Apple CarPlay [ Russell  Jan 15, 2017 ]
Best fit for driving my Honda Ridgeline subwoofer [ GARY L  Jul 06, 2016 ]
I am looking for a small amount of CLEAN power in a small package. This looks like it will work perfectly! [ Scott  Apr 22, 2016 ]
Was looking for an amp that would not require wiring a separate power cable to subwoofer yet add enough bass to my sound system to be worth adding. [ Chris  Apr 20, 2016 ]
Factory equalizer did not support separate power for after-market sub. [ Stanley  Jan 02, 2016 ]

7 questions already asked

Sorry, I do not know. I have a 2004 Toy 4 Runner, the rear speaker went, I called Crutchfield, bought a new speaker and followed the techs suggestion to obtain this little amp. [ JAMES A  Jun 07, 2018 ]
...I guess you could BUT this amp only has speaker level inputs, and a low pass filter. Kinda need a high pass or bandpass for a center channel. It has been playing into a 1.3 ohm load in my truck for almost two years FWIW. Great amp. [ adam  Jun 06, 2018 ]
Class D with 1% THD, you could use it as a center channel, but I'd personally want something cleaner to produce vocals and midrange. This is more for replacing the subwoofer output on a factory radio to the small-ish 6" class woofers that some cars have. [ Joe  Jun 06, 2018 ]
I'm not familiar with KTP455u. But most head units require a male rca adapter at the unit. There are no rca's on this amplifier. You have to connect the wires on the harness provided. you would need to purchase an adapter with male rca's on one end to speaker wires on the other. Amazon is a great place to find something like that. I think you should find one for $10 or less. [ TIMOTHY  Jul 18, 2017 ]
I only remember there being high level wires that hook to radio speaker wires. No rca hook ups. [ Jason  Jul 17, 2017 ]
The only way I know to hook this up is to split of of the rear speaker wires and wire into this unit and out to sub. You can purchase the Rux-Knob to try to match the sub volume to the rears. Once adjusted, all the speakers will raise and lower in volume together from volume knob on tour head unit. This unit is mainly used to add a sub to a stock setup without much fuss. Other wise you may be better off going with a legit amp. Hope this helps. [ John  Jul 17, 2017 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections and settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Kenny  Jun 22, 2016 ]  Staff
I'm not sure I will be of any help to your question. I'm running this amp mono to my stock sub in 2008 Honda ridgeline. It works great for that, also small enough to fit behind my head unit. Great little power pack! [ douglas  Mar 03, 2016 ]
This will depend a bit on what you are connecting to the amplifier. The easiest way would be to connect a single 2-ohm DVC subwoofer wired in parallel. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat to discuss other wiring configurations. They should be able to help discuss what you will be connecting and the best way to wire it. [ Jeff  Dec 28, 2015 ]  Staff
it has speaker only hook ups and i might add with a rux knob its really nice! [ CRAIG  Jan 05, 2015 ]
This unit only accommodates line level inputs, no RCA inputs available. I installed this unit and a Pioneer TS-SW2002D2 in the rear deck an 2005 Acura TL. I was looking for a super small amp so as not to add components to the trunk space in this car. I'd be careful when using this with an OEM speaker. You may have issues with frequency range and/or power rating.. Good luck. [ ANTHONY J  Jan 02, 2015 ]
they make an speaker to RCA adapter I did not try this I just connected directly to the rear speaker channels it requires a left and right input. [ Keith  Jan 02, 2015 ]
There is no rca inputs. You have to wire it together. It is not hard to do. We wired it just to our regular speakers. Our sub is powered by its own amp. [ Troy  Jan 01, 2015 ]