

⚡ Unleash Marine-Grade Power in a Compact Package!
The Rockford Fosgate TM400X4ad is a compact, 400 Watt Class-AD 4-channel amplifier engineered for marine and motorsport use. Featuring proprietary Constant Power technology, it delivers up to 25% more power across all impedance loads. Its Element Ready design ensures durability against dust, UV, and corrosion, while advanced audio controls provide superior sound quality. With a sleek footprint and a 2-year warranty, it’s the ultimate amplifier for professionals demanding powerful, reliable performance on the water or off-road.





| ASIN | B00YWCRKEQ |
| Best Sellers Rank | #44,506 in Electronics ( See Top 100 in Electronics ) #19 in Marine Amplifiers |
| Brand | Rockford Fosgate |
| Customer Reviews | 4.6 4.6 out of 5 stars (307) |
| Date First Available | March 10, 2015 |
| Exterior | Painted |
| Global Trade Identification Number | 00780687345150 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.2 pounds |
| Item dimensions L x W x H | 13.4 x 6.5 x 11.3 inches |
| Item model number | TM400X4ad |
| Manufacturer | Rockford Fosgate |
| Manufacturer Part Number | TM400X4AD |
| Maximum Supply Voltage | 12 Volts |
| Model | Rockford Fosgate TM400X4AD |
| Mounting Type | Boat Mount |
| Number of Channels | 4 |
| Output Power | 400 Watts |
| Product Dimensions | 13.4 x 6.5 x 11.3 inches |
| Specification Met | Cea-2006 Compliant |
| UPC | 780687345150 |
| Voltage | 12 Volts |
| Wattage | 400 watts |
C**T
GREAT AMP! VERY SATISFIED!
Installed in my RZR, using Amp to run 2 6.5" Kickers up front and 2 8" Kickers in the rear. This amp does an amazing job! Very clean sound and such a small package. Definitely worth it!
M**.
Great sound, maybe too much for the price.
This Rockford Fosgate amp is actually more than I was looking for. I upgraded my 18 Limited with a new head unit, this amp and 4 new RF 6.5 speakers. The amp alone would have blown the factory speakers. I don't have to turn it up over half way to be able to hear it at 80mph on the freeway. It's easy to set up with the videos on the Rockford site. Also get the right plug and play wiring harness so there are no splicing of factory wires.
D**.
Worth the money !
Installed this on my 2019 Electra Glide Standard FLHT, using Sony MEX-M100BT head unit, with Infinity Kappa Perfect 600x and 900X speakers. This amp is LOUD and clear, with ample bass ! Was running an Soundstream Picasso Nano PN4.1000D for 3 years, but kept blowing tweeters because the wires would come loose from the amp due due vibration, it still works, and is a great amp, just not built for motorsport applications. The wires on the TM400Xad are soldered to pigtails then plug into the amp, preventing this problem. Also, the input and output clip setup makes it pretty much impossible to blow speakers, would highly recommend this amp to anyone looking to upgrade their motorcycle audio system.
N**Z
Big power in a small package
This has more than enough power to drive most coaxials or components. Fast delivery.
M**R
It ships with the wrong Front In Aux Cord
I ordered my first one and it had the wrong front speaker in plug, so I submitted for a replacement and they sent another right out, however the new one had the same wrong front speaker in aux cord. I contacted Rockford Fosgate and they sent me the correct attachment at no cost. If your putting this on your Harley like I did buy the installation kit from Rockford Fosgate and save 32.00. It’s 299.00 tax and all from them. Call Rockford Fosgate for your amp settings the tech support at Fosgate was amazing! They were all very knowledgeable and pleasant to speak with. Performance the amp is great my bike sounds amazing! Amp actually put out 550 amps. Each amp comes with a data sheet for your amp. I would definitely recommend this for your bike.
A**R
Awesome Amp
The ample makes my speakers sound like a full stereo system. It's awesome, base and everything sound is great! Awesome Amp!
T**M
Fosgate amp
Everything worked out good everything installed well along with the installation kit for the amp, which was a little pricey for metal overall, everything is in and working👍
A**R
Must have
Works great in Harley ultra
D**E
The power and quality of this amp was exactly what i was hoping for. As an old fosgate user back in the day with my Punch 150 in my car, this new amp im running 4- 6x9’s in my Road Kind. Im so satisfied that im planning to order another for my Ultra Classic
H**E
Sehr gut! Leistungsstarker Verstärker! Qualität die hält was sie verspricht Danke Lieferung sehr schnell , Verkäufer ist absolut zu empfehlen!!!! Danke
M**S
Excelente aparato muy buen sonido calidad vale lo que cuesta
A**R
Installer dans un FLHTK 2016, ça blast à mon goût !!! 💯👍😉😎
Y**Y
Excellent product, the sound is totaly perfect
Trustpilot
1 month ago
2 months ago