Rockford Fosgate TM400X4AD
Joseph from Bulverde, TX on 4/8/2025
This little Power beast plays plenty loud and puts out some clean sound! Rockford technology at its finest. I am running it in my 2020 Toyota Land Cruiser to front and rear Focal K2 Power separates. The amps are hidden behind the rear panels, which makes for a clean install. If you are looking for something simple without any custom mods, this is a great solution.
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0 of 0 found this helpful
TM400X4AD
Mark from Redding, CA on 3/10/2025
Nice little amp with tons of power for your needs. Installed in my Yamaha Yxz 1000rss driving 4 pods and 1- 10" sub with no problem and clean sound. Thank Crutchfield for all your help.
Pros: Nice little amp with plenty of power, easy wiring and setup
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0 of 0 found this helpful
Wonderful amp.
Matthew from Argyle, TX on 12/16/2024
2015 Honda CRV
This amp is so cool! Driving 4x kicker 46CSC674 in my 2015 honda crv. The unit is small and fits under my passenger seat without issue. Easy to wire and make adjustments on.
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0 of 1 found this helpful
not for me, it screwed up my RF head unit
John from OMAHA, NE on 10/21/2024
Well made unit but ... there was no mention that it comes with no power cable and you must buy the amp kit. After finding that out and after hooking everything up, the radio lost FM tuning and volume and was ether full blast or nothing at all, my RF head unit didn't work correctly at all. I disconnected everything and went back to just the radio and RF speakers front and back and the head unit works just fine. I'm sure a pro could figure this out but I already spent 700$ on the set up. Color me disappointed.
Pros: well made and small enough to fit under the fairing
Cons: Comes with 4 speaker wires with no ends on two, the other two are RC, no instructions worth anything, no power cable, no mounts unless you get the amp kit, and after all that it still doesn't work.
1 of 7 found this helpful
Rockford Fosgate TM400X4AD
Luke from FORT LAUDERDALE, FL on 9/12/2024
Channel separation is great Drives two 6.5s and a 8 sub well Eq boost is surprisingly good
Pros: Ad class Easy to tune
Cons: 8g wire will never fit the terminals Rca and speaker connections are not idiot proof
3 of 3 found this helpful
Great Great Great !!!
Mark from Bridgeport, WV on 8/28/2024
had this amp in my 20CVO Limited and something happened and had to replace - great product at a great price and great shipping - definitely recommend!!
Pros: delivers great sound at a great price
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0 of 2 found this helpful
Impressed
Nathaniel from AUBURN, IN on 8/26/2024
2011 Harley-Davidson Street Glide
This pushes my 6.5 and 6x9 speakers in my street glide very well . Never over heats and sounds amazing even at 80mph . Buying another for my ultra .
Pros: Small , fan cooled and clean
Cons: 0 issues to report
1 of 1 found this helpful
Small Package Dynomite
Jody Dale from Pearland, TX on 8/20/2024
2014 Chevrolet Silverado 1500
very well made, using this to drive 4 wet sounds 6.5 REVOs in my golf cart, needless to say, the volume gets cranked up at the beach. Would recommend
Pros: very small package mount anywhere Plus power rating
Cons: No Mounting Bracket (minor)
1 of 1 found this helpful
Perfect Size for a boat
Tyler from Pinckney, MI on 8/1/2024
Small enough to fit in the tight places on a boat and very easy to tune. very impressed, sounds great with my four kicker 8" speakers on the boat.
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0 of 0 found this helpful
Great sound
Edward from Pearl River, LA on 6/30/2024
I put this Rockford fosgates amp along with speakers on my 2019 Street glide. What an awesome sound. The amp is adjustable and it sounds perfect
Pros: Great! All around sound
Cons: I have none
1 of 1 found this helpful
Rockford Fosgate TM400X4AD
Jason from Hardy, VA on 6/24/2024
1997 Toyota Avalon
Second time using these in different applications. They are a very solid amp
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1 of 1 found this helpful
Good amp ruined by poor product design
Thomas from GILBERT, AZ on 6/15/2024
2022 Nissan Frontier
Fantastic amp but the positive and negative power wire inputs are nearly a dealbreaker (zero stars). The 8 gauge amp wiring kit FROM Rockford Fosgate is WAY too thick to fit into the tiny + and - power connectors. I ripped my hair out for weeks trying to make a solid connection. Bought 8 gauge to 10 gauge reducer / adapters and even they were too big to fit into the tiny openings. Grinded them down to about 12 gauge and they fit but would not stay secure. I live near Rockford Fosgate's headquarters in Tempe so I drove there! The super friendly and kind tech guys said, "yeah they're tight" but couldn't offer a solid solution. Ended up carefully shaving the 8 gauge wire down to about 12 gauge to make it fit securely. What's the point of their expensive amp wiring kit if it doesn't work with the amp?? Extremely poor design that literally BREAKS an otherwise great amp. I would not buy this amp again.
Pros: Sounds great
Cons: Wiring connections ruin this amp Amp runs extremely hot all the time
5 of 6 found this helpful
Powerful Performance, but Handle with Care
Skyler from Otsego, MI on 6/7/2024
2021 Ram 1500
The TM400X4AD BUMPS! There is no question about the power of this unit. It provides very nice clear crisp audio and it drives my 4 channels very well. The clipping indicator lights are fantastic to know when you're pushing just a little too much, nice added feature. However, this unit gets very hot. Its in a well ventilated area, and within the first 20 minutes, its too hot to touch. I've read similar reviews saying the same thing, but it needs to be known - I would not run this amp without a cooling system of some sort. I have purchased computer fans to keep this unit cool and run air over the cooling fins. The power is nice, but I don't trust the longevity, heat is the #1 killer of electronics.
Pros: Powerful amp for the footprint Small compact size Feature rich
Cons: Longevity is questionable Runs very hot
3 of 4 found this helpful
Rockford Fosgate TM400X4AD
Mayo from Fullerton, CA on 5/23/2024
2010 Harley-Davidson Street Glide
Awesome upgrade to my 2010 Harley Davidson Street Glide. Sounds amazing.
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2 of 2 found this helpful
Good little amp
Jameson from Maysville, KY on 5/17/2024
2015 Jeep Wrangler
Sounds great. Small footprint. Pushes my speakers nicely. Waterproof for the Jeep.
Pros: Small. Waterproof. Big sound.
Cons: The power and ground terminals suck. Says 8AWG wire required and it's too large to fit the terminals in the connector. Had to get reducers to fit. The input and output connectors are identical. Some engineering changes are due for this Rockford Fosgate amp
3 of 4 found this helpful
Rockford Fosgate TM400X4AD
Donald from Fort Wayne, IN on 4/24/2024
2005 Harley-Davidson Electra Glide Classic
Excellent amp, had one in other bike , bought one for roadglide
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1 of 1 found this helpful
Nice Harley Amp
Jason from Arlington, TX on 4/22/2024
Nice Harley Amp that works with the Fosgate RoadKing wiring harness for Bluetooth capability. I did bridge it to push 200 watts to two Boss 6x9's that came in the Boss Harley Saddlebag lid kit. Sounds great if you follow the tuning tips.
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3 of 3 found this helpful
400 watt 4 channel Fosgate Amp
Daniel from Swanton, OH on 4/7/2024
2011 Toyota Tundra
The price advantage on these were incredible..if you know Fosgate, you'll know that the power seems much higher than they are rated for...and the clarity is second to none!
Pros: Clarity, power, and ease to conceal in a boat
Cons: Haven't found any
0 of 0 found this helpful
Good stuff
Adriana from Calhoun, GA on 3/25/2024
2022 Ford Bronco
Great product. Enjoy shopping with you guys
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Jason from New Madrid, MO on 3/19/2024
0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Scott from Wichita, KS on 3/19/2024
Good powerful amp. But the power inputs need some redesign for sure. But other than that. Solid amp so far
Pros: Power and size Sound control
Cons: Power inputs
2 of 2 found this helpful
Great amplifier
Anton from Louisville, KY on 2/18/2024
2005 Harley-Davidson Ultra Classic
Nice power for a pair of 6 1/2's upgrades in 2005 Ultra Classic with future plans to add a pair in lowers.
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0 of 0 found this helpful
Rockford Rocks my Camaro!
Randy from FRESNO, CA on 2/15/2024
2005 Chrysler 300
There is not a lot of storage room in my 2002 Camaro SS convertible so I was looking for an amp and setup that would not infringe upon that limited area. I wanted a powerful but compact amp to install in the original mounting location for the factory Monsoon amp. I experimented with a few different amplifiers and finally opted for the Rockford TM400X4ad. I used a Metra 70-2002 radio connector and pinned it correctly for the speaker wires which allowed me to easily tap into the factory wiring harness from the original amp connector, allowing me to use the existing speaker wires. 4 gauge power wire runs from the battery to a circuit breaker and then up the right side of the car to a 60 amp fuse and the amp. I routed the RCAs from the head unit up the console, through the carpet between the rear seats and into the trunk area. After fashioning a mount out of 1/8" ABS plastic, I screwed the Rockford to it and then mounted it to the original bracket. It is just the right size for squeezing back into the stock mounting position!
Pros: Love the built in clip lights for set up which made that chore easy. It was good to see that, on the input side, my Kenwood Excelon DMX958XR did not clip all the way up to its max volume. This amp screams and provides plenty of power to the front CDT Audio ES-60CV.2 speakers and the rear Earthquake Sound SWS-6.5" shallow mount woofers
Cons: Not too crazy about those captive c-clamp connectors in the power plug. You need a thinner insulation 8 gauge wire to fit inside the slot that leads to the actual connectors. Most of my 8 gauge cables did not fit. Fortunately I had a bit of 8 gauge Esoterica wire from years ago that did fit. I still found it difficult to adequately secure the power and ground without them trying to back out. I fastened down those wires to my mount with zip ties so they are less likely to work loose.
4 of 4 found this helpful
Great sound
Nery from Woodbridge, VA on 2/14/2024
Amazing, the output and sound quality is incredible. Well done Rockford.
Pros: Crisp and clear
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Asmat from Middletown, NY on 1/31/2024
0 of 0 found this helpful
Great deal, great amp!
Crutchfield customer from Austin, TX on 1/22/2024
Love it! I especially love the great deal I got since it was on sale and further discounted as a scratch and dent. Easy to install underneath my Boat's center console where it will stay high and dry. And the sound is way clearer and crisper than with my head unit, alone.
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1 of 1 found this helpful
Awsome
Ruben from EL PASO, TX on 1/15/2024
Amazing little amp, nice and loud with great SQ. Powering all 8 speakers in my fusion with confidence!
Pros: Great options
Cons: Fan can get a little noisy
1 of 1 found this helpful
Good sound
Victor John from Glenview, IL on 11/14/2023
Plug and play replacement (different brand) on a boat.
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0 of 0 found this helpful
Excellent
William from Hagerstown, MD on 7/18/2023
2013 Harley-Davidson Road Glide
Installed this on my Harley Roadglide. I replaced a smaller amp (Rockford 300X4) I had installed previously, and this one sounds excellent in comparison. Additionally, being able to adjust it from the top instead of the ends is much more convenient.
Pros: Sounds excellent, easy to use controls
Cons: About as large as you can fit in the fairing
2 of 2 found this helpful
Rockford Fosgate TM400X4AD
Jason from Gratz, PA on 7/10/2023
its amazing how much better my car sounds with this amp, and compact size is great
Pros: small size , powerfull
Cons: speaker leads instead of connection
0 of 0 found this helpful
Rockford Fosgate TM400X4AD
John from Hot Springs, AR on 7/9/2023
Great compact amp. Perfect for motorcycles or side by sides. It fits perfectly under the dash of the RZR and works excellent. Lots of punch for a small amp.
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Teddy from Manalapan, NJ on 11/18/2022
2019 Harley-Davidson Road Glide Special
Just installed in my Road Glide. So far the performance is good. Easy to install with the bracket. Highly recommended!!!
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Paul from Pearcy, AR on 10/17/2022
2006 Dodge Ram 2500
0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Michael from Courtland, VA on 9/27/2022
Awesome system buy a wiring harness so it is a snap and play. Great system
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Chris from Wolverine, MI on 8/29/2022
2010 Harley-Davidson Street Glide
Amp test above 400 watts.rear speakers will be here by end of the day can't wait to have my RF system completed. Front speakers by them self sound very clean ??
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1 of 1 found this helpful
This thing rocks
Ron from Doylestown, PA on 8/25/2021
2019 Polaris General
Installed in my Polaris General with RF 150 watt speakers and 200 watt sub and this thing rocks! First one was defective, but the second has worked flawlessly.
Pros: Powerful and clear
Cons: None
0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Anderson, IN on 8/24/2021
I bought for my boat . Plenty of power and clear sound.
Pros: Size, Power
Cons: None so far
0 of 1 found this helpful
Rockford amp
Crutchfield customer from Appleton, WI on 4/6/2021
Great amp. This one is going in my boat.
Pros: Power
Cons: None
1 of 2 found this helpful
Great for a Harley
Crutchfield customer from Ormond Beach, FL on 3/20/2021
Great fit on my softail sounds great with Infinity mounted on a reckless batwing
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2 of 3 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from San Jose, CA on 1/23/2021
2016 Harley-Davidson Street Glide Special
2 of 2 found this helpful
Fosgate FTW!
Crutchfield customer from Modesto, CA on 1/18/2021
It's clean and it's loud. What else do you want in an amp?
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1 of 2 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Yakima, WA on 6/29/2020
AWESOME !!!!!!!!!!!
Pros: Loud, clean and compact
Cons: Just price
2 of 2 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Ormond Beach, FL on 5/21/2020
Directions are terrible for set up
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Cons: Not many options for mounting for a marine amp
3 of 9 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Onsted, MI on 5/11/2020
This works great with the PMX-HD9813. Has plenty of power for 6 speakers
Pros: Just a great piece of equipment
Cons: None
3 of 3 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Springfield, VA on 5/1/2020
2015 Harley-Davidson Street Glide Special
Amazing sound. Only downfall is it doesn't come with a bracket. Pumps out a lot of sound. Very impressed with how my stereo sounds
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2 of 3 found this helpful
Amazing sound
Crutchfield customer from Waukee, IA on 3/22/2020
This amp is incredible!! Added to my Ultra Limited with the RF install kit and Focal speakers. The sound is pure, clean, crisp and amazing! Already the envy of all my riding friends. Highly recommended.
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2 of 2 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Roscoe, SD on 3/3/2020
Works awesome with my 10" sub in my polaris general.
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2 of 2 found this helpful
Victory Cross Country Tour 2016 - Volume with System Protection
Crutchfield customer from Sullivan, MO on 2/28/2020
Installed on 2016 Victory Cross Country Tour, under front fairing, across aluminum fairing frame using aluminum sheet metal bought at the hardware store, and drilling and threading hole on brake side of frame. This powers Polk MM525, 5 1/4" speakers in front fairing, and Kicker 5.25 in speakers in tour pack/trunk. This replaced the previous (short lived) Rockford Fosgate PBR300x4, that kept blowing the speakers, and was over heating. This helped as it has its own fan, and provides more power for the volume I wanted at high speeds, and maybe most importantly has signal clipping indication, which shows the maximum I can turn my system to without damage.
Pros: Fans for overheat protection, while in slow traffic. System protection with signal (clipping) indication. Power for volume.
Cons: Power and ground wire connectors not sized properly for recommended wire size, could be bigger.
1 of 2 found this helpful
Best compact amp
Lucas from Mobile Alabama on 7/9/2019
This is a powerhouse amp! Don't let its size fool you it will power any door speakers on the market to their limits! Size fits anywhere on any vehicle and very efficient for its size!
Pros: Super efficient, priced well, clean install, easy gain setting, powerhouse
Cons: Would love to have 4gauge inputs but not super necessary.
3 of 3 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Rogers, TX on 5/21/2019
This was an awesome Put it on my street glide 6 and a 1/2 inch speakers and man it made a difference
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3 of 3 found this helpful
Rockford Fosgate TM400X4AD
Crutchfield customer from Dexter, NM on 4/25/2019
2 of 2 found this helpful
Rockford Fosgate TM400X4AD
Eric from Vacaville, CA on 1/24/2019
Was easy to install very straight forward and simple with a few basic hand tools. Sounds amazing as well
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0 of 0 found this helpful
Rockford Fosgate TM400X4AD
david from rossburg ohio on 1/6/2019
great amp works great, install on polaris ranger wiring kit was awesome thanks Garret for the great help with intall..and walking me thru setup!
Pros: easy made to fit polaris with kit awesome sound great tech support at crutchfield.
Cons: instructions could be better,that come with it,,but garret got me thru it,
0 of 0 found this helpful
Rockford Fosgate TM400X4AD
Terry from Donna, TX on 10/28/2018
Fantastic. Installed on Harley touring and it rocks.
Pros: Easy installation set up,small size
Cons: Hate the power connector. The pos and negative are so close together you really have to be cautious with the recommended 8 GA wire.
4 of 4 found this helpful
Big clean power, small chassis design
Brian from Port St Lucie, FL on 10/28/2018
Replaced a 20 year old volfenhag amp that was rather large. This amp is just as powerful with a much smaller footprint. The wiring and installation was very easy and the sound quality is very good. Glad to see that technology is making big power out of small chassis designs. Recommend to others.
Pros: Very small chassis which makes it easy to mount, clean powerful amp. I turned it up to max level for 30 minutes continuously, the amp got hot but never cut off. I am impressed. My kicker amp when it gets hot shuts off to protect itself.
Cons: None to talk about
3 of 3 found this helpful
Awesome amp!
jeffrey from Poplar Grove, IL on 5/6/2018
Previously I had the 450? Hog tunes set up in my 2007 H D fhhtcu (ultra), this amp is a HUGE sound upgrade. I called Fosgate to get recommended set up leveled for the amp, lows are cut off at about 80 he. I have titan7.1 in the front and the hog tuns in the back. Now the music actually hits hard, and clarity is incredible. People in our ride pack can't hear there own stereo when ridin. It's awesome ??
Pros: All good
Cons: None yet
4 of 4 found this helpful
Sounds good, but there's fitment issues
Len from Dayton, OH on 5/3/2018
I installed this amp with the amp mounting bracket on a 2013 harley road glide. The head light wouldn't fit in the fairing afterwards. I was told by customer service at rockford fosgate that they're aware of the fitment issue and that I'd need to cut a one inch square off the amp bracket for the head light to fit. I cut the bracket as instructed and the headlight still doesn't fit because the amp is in the way of the head light. I disconnected the left head light so it would fit back in the fairing and am only using the right head light at the moment. Maybe I will put the amp in the bag and remove from the fairing so both head lights will work. With the fitment issue this deserves one star. But after adding the RF 6x9 bag speakers with this amp, along with focal front speakers and aquatic head unit with serius. It does sound very good. Hence 2 stars instead of one
Pros: Good sound
Cons: Does not fit in fairing of 2013 road glide as advertised. Maybe I'll install in a bag
2 of 10 found this helpful
ROCK N ROLLLLL
James from Sarasota, FL on 11/11/2017
Upgraded from the Fosgate pb amp and added Fosgate saddle bag speakers. This system ROCKS!
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3 of 4 found this helpful
Disappointed
Crutchfield customer from Astoria, NY on 11/9/2017
I was so excited when the amp arrived Wednesday just in time for my big trip Friday( 3 day weekend ) I installed the amp everything was smooth until I turned it on to check it before puttin the roadglide fairing on and no left channel. Ok maybe I did something wrong I pulled out the amp checked all connections and found that the speaker output plug coming out of the amp is the cause when pressure is applied it works when released the left speaker shuts off . I put the bike back together using the rear outputs until Crutchfield sends me a replacement when they come back in stock date unknown. I was so mad I recorded the event and will be posting a video on YouTube about it unless someone makes this right for me. Right now I feel like this is just another overpriced piece of junk!
Pros: Easy install, no cutting wires
Cons: Mine doesn't work
7 of 20 found this helpful
Great for 2015 Harley Ultra Classic
Paul from Florida on 12/14/2015
Installed this on my 2015 Harley Davidson Electra Glide Ultra Classic and what a difference it has made. I also installed Focal speakers and tossed the hog tunes speakers in the trash! When I pump up the volume, you can hear the music two blocks away. I am a happy camper.
Pros: Very clear and no distortion. LOUD! It will blow you off the bike.
Cons: Must get the radio flashed at the Harley shop with the instructions supplied on Rockford Fosgate web site. Once the flash is done you need to select the two channel mode. Once the flash is done, the head unit looses the front and rear fade capability and does not send out rear speaker signals. The Amp in 2 channel mode does send the output signals to both front and rear speakers. Once you fine tune the Amp, you will have one heck of a sound system.
11 of 11 found this helpful
