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Rockford Fosgate Power Marine TM400X4ad

400W Class AD Power Series 4 Channel Marine Amplifier

Limited time!
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• 100 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class AD 2 ohm Stable 4-Channel Amplifier

Learn more about the tm400x4ad
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Current Promotions (1 offer)


This offer cannot be combined with any other coupons or offers.

Rockford Fosgate Power Marine TM400X4ad

15% off


Priced separately $696 98

Promo Savings of $10 05

Total price:

$686 93

Product Highlights


• 100 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class AD 2 ohm Stable 4-Channel Amplifier

Description


Rockford Fosgate brand icon

Authorized dealer

Product Details:

  • Power Series Class AD 2 ohm Stable 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohm: 100 watts x 4 channel
    • 2 ohm: 100 watts x 4 channel
    • Bridged: 200 watts x 2 channel @ 4 ohm
  • Total power output: 400 watts
  • LED Power/Protect Light
  • Speaker-level (high-level) inputs
  • CEA-2006 compliant
  • CLEAN set-up technology
  • Conformal-coated circuit board
  • Input sensitivity: .15 - 12 volts
  • Frequency Response: 20 - 20000 Hz
  • Total Harmonic Distortion (THD): <1%
  • Variable high-pass filter: 50 - 250 Hz
  • Variable low-pass filter: 50 - 250 Hz
  • Variable Bass Boost: 0 - 18 dB
  • Fuse Rating: 60A
  • 8 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 8-5/8" L x 4-5/16" W x 1-11/16" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: TM400X4ad

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Specifications & Details


Key Features
Amplifier Key Features
Bass Boost
Fan Cooled
Speaker Level Inputs
Weather-Resistant
Power Specifications - Full Range Channels
RMS Power @ 4 ohms
100 watts x 4 channel
RMS Power @ 2 ohms
100 watts x 4 channel
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
Power Series
Amplifier Class
AD
Number of Channels
4-Channel
Total Peak Power Output
400 watts
Total RMS Power Output
400 watts
Maximum Input Gauge Size
8 AWG
Minimum Impedance Unbridged
2 ohm
Minimum Impedance Bridged
4 ohms
Frequency Response
20 - 20000 Hz
THD at Rated RMS Power
<1%
Speaker Level Inputs
Yes
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
50 - 250 Hz
Low-Pass Crossover Frequency
50 - 250 Hz
Bass Boost
0 - 18 dB
Remote bass/level controller
No
Fuse Rating
60A x 1 
Total Fuse Rating
60
Sonic Certified Amplifier
Not Tested
Low-Level Input Sensitivity
.15 - 12 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
Quick start guide
Power certification
WITB: Amplifiers
Amplifier
High-level input wiring harness w/ molex connectors (2)
Other Accessory #1
Two 14" Input harnesses (2 RCA to 4-pin Molex)
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

TM400X4ad

Weight:

3.40lbs

Internal SKU:

tm400x4ad

Internal Product ID:

94295

Product and How-to Videos


Customer Ratings & Reviews


Rockford Fosgate Power Marine TM400X4ad thumbnail image

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
5
Design
5
Usability
5

Customer Photos & Videos


Customer Reviews

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Rockford Fosgate

My item arrived packaged well, is much smaller than I imagined and will be great for installing in my boat. I have used the T series amplifiers in the past in cars and have no doubt this amp will be perfect for my 4 boat speakers. The killer deal I got helps too! Took advantage of the additional warranty as well.

Update:
Installed this amplifier with a Kicker install kit and Kicker marine speaker wire, 4x 6.5" M1 marine speakers and the Memphis SMC3 head unit.
Seriously the best audio system I've ever heard on a boat, gets super loud and is super clear with phenomenal bass for 6.5" speakers. Sounds better than my buddies boats with wetsounds and JL setups and I only spent about $1,000 for the entire system. Setup with the built in clipping indicators made it easy to achieve full safe volume. Set my HPF to 50hz.

By Tyler on May 9, 2024 Checkmark Icon Verified purchase

14 found this helpful


By Terrance on March 11, 2024 Checkmark Icon Verified purchase

13 found this helpful


By Kevin on April 28, 2025 Checkmark Icon Verified purchase

1 found this helpful


Fosgate TM400X4ad – Small Amp, Big Attitude!

Running the Rockford Fosgate TM400X4ad in my 2013 Harley-Davidson Electra Glide Limited with 10 speakers, and let me tell ya this thing flat-out bangs. It’s small enough to tuck away clean, but the power it pushes is unreal. Crystal-clear highs, deep bass, and it keeps every one of those speakers screaming even at 80 down the highway. I’ve had people turn their heads at stoplights wondering where all that sound’s coming from — then I point to this little beast and they just shake their heads.

This amp runs cool, never clips, and delivers pure, clean power every ride. Rockford Fosgate really built a monster in a mini package with the TM400X4ad. Trust me you can hear me long before you see me roll up.

By Adam on October 5, 2025 Checkmark Icon Verified purchase




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

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