Garage
Shop

Customer Ratings & Reviews


Rockford Fosgate M400-4D thumbnail image
View product page

5 star
83%
4 star
17%
3 star
0%
2 star
0%
1 star
0%



Durability
4.5
Value
4.9
Features
4.7
Design
4.7
Usability
4.9

Customer Reviews

Sort by:

Loading...

Compact but Powerful

I bought this amp to put in a bass boat and I was very surprised when I opened the box. It's a very small amp and I had no problem mounting it where I wanted. It runs cool and powers my speakers with ease. My birth sheet said 507 watts.

By Jacob on March 17, 2014

34 found this helpful


Ole school

The ease of use and install, the look and design are awesome, the output is consistent and clear. I matched it with the rest of my Rockford Fosgate stereo. I am happy with it

By Ole school on September 19, 2013

30 found this helpful


AWESOME!

This amp is AWESOME! Sounds great! Comes with a certification saying my serial unit was tested to 536 RMS. Would highly recommend.

By Randy on September 12, 2013

26 found this helpful


Good sound, small package

I have this amp pushing a pair of RF 262s and a pair of RF 282s. Much better sound than my previous MB Quart amp (and that one didn't sound bad either). Time will tell how it holds out - only 3 stars on durability because I have only had it for a few week no, but 0 issues.

By Gro on May 31, 2013

25 found this helpful


Real Good Amp

It's my first marine amplifier. I used it whole summer. Can drive it at max without over heating. The longer period I used it is about three hours at maximum volume and the battery is still good for start the motor. Use it bridge with two eight inches Rockford Fosgate M282.

I Really think it's a quality amp and would buy it again.

By JayBee on October 31, 2012

22 found this helpful


Powerful amp.

Great amp. I have installed three of these and only had problems with one. I would recommend this amplifier.

By Coody Bug on February 2, 2020 Checkmark Icon Verified purchase

4 found this helpful


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2020 Ford Ranger

1992 Dodge Dakota

2007 Mazda B4000

2006 Isuzu Ascender

2013 Suzuki Kizashi

2007 Maserati Coupe

1987 Dodge Diplomat

2025 Genesis G70

2011 BMW 3 Series

1998 Audi A4 Quattro

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.