Search  for anything...
Rockford Fosgate

Rockford Fosgate TM400X4ad Power Marine 400 Watt Class-ad 4-Channel Amplifier

  • Based on 290 reviews
Condition: New
Checking for product changes
$577.77 Why this price?

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 2 left in stock, order soon!
Fulfilled by Stephens Cup of Joe LLC.
Arrives Saturday, Jul 12
Order within 11 hours and 8 minutes
Available payment plans shown during checkout

Features

  • Our compact (1.6 x 4.3 x 8.3) Power Marine TM400X4ad 4-channel amplifier produces more power per square inch than any other model we make with 400 Watts of POWER
  • Proprietary Constant Power amps are the most powerful on the market, delivering up to 25% more power across all impedance loads (100 Watts x 4 @ 4-Ohm or 100 Watts x 4 @ 2-Ohm or 200 Watts x 2 @ 4-Ohm Bridged)
  • Built on Rockford Fosgates proprietary Class-AD technology and Element Ready protecting against dust, UV, and corrosion, making it perfect for motorsport and marine applications
  • High-level auto turn-on, CLEAN circuit input/output clip detection, On-board Punch EQ with +18dB boost @ 45Hz and 12dB/octave Butterworth crossover make TM400X4ad an impressive POWER house
  • Famous Rockford Fosgate build quality ensures that the TM400X4ad will handle everything you throw at it! Full 2-year parts and labor warranty

Item dimensions L x W x H: 13.4 x 6.5 x 11.3 inches


Voltage: 12 Volts


Manufacturer: Rockford Fosgate


Maximum Supply Voltage: 12 Volts


Mounting Type: Boat Mount


Item dimensions L x W x H: 13.4 x 6.5 x 11.3 inches


Voltage: 12 Volts


Manufacturer: Rockford Fosgate


Maximum Supply Voltage: 12 Volts


Mounting Type: Boat Mount


Brand: Rockford Fosgate


Number of Channels: 4


Output Power: 4E+2 Watts


Specification Met: Cea-2006 Compliant


Material: Not Obtainable


Global Trade Identification Number: 50


UPC: 780687345150


Product Dimensions: 13.4 x 6.5 x 11.3 inches


Item Weight: 2.2 pounds


Item model number: TM400X4ad


Is Discontinued By Manufacturer: No


Other display features: Wireless


Whats in the box: Rockford Fosgate TM400X4AD


Date First Available: March 10, 2015


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jul 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • 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!
Reviewed in the United States on March 6, 2025 by Cole Boatright
    • 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. ... show more
Reviewed in the United States on September 8, 2023 by David M.
    • Awesome Amp
The ample makes my speakers sound like a full stereo system. It's awesome, base and everything sound is great! Awesome Amp!
Reviewed in the United States on July 5, 2023 by Amazon Customer
    • Fosgate amp
Review Image by Todd M Todd M
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👍
Reviewed in the United States on July 25, 2024 by Todd M Todd M
    • Great sound, maybe too much for the price.
Review Image by Matt G. Matt G.
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. ... show more
Reviewed in the United States on April 19, 2025 by Matt G. Matt G.
    • 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. ... show more
Reviewed in the United States on April 26, 2024 by Mark Bratcher
    • Must have
Works great in Harley ultra
Reviewed in the United States on February 16, 2025 by Amazon Customer
    • Amp
Works great little pricey but fill well
Reviewed in the United States on July 26, 2024 by Terry masterson

Can't find a product?

Find it on Amazon first, then paste the link below.