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

Curated from 38 real Reddit conversations

Refreshed on: January 24, 2025

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

Brand: Rockford Fosgate
Price: $344
Snoop Score:
8.3
Sentiment
8.3
Popularity
9.9
Technical
7.2
Buy on Amazon for $344See All Marine Amplifiers Reviews
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Snoop's Take

The Rockford Fosgate TM400X4ad is a compact, high-powered 4-channel marine amplifier engineered to deliver 400 watts of rugged performance wherever the waves take you. It’s built with Rockford Fosgate’s proprietary Class-AD technology, ensuring reliable power output in the harshest marine environments. Community chatter shows a divided scene: while one enthusiast boasts, "Rockford and JL are the only amps I buy, expensive but worth it imo," critics warn against current market alternatives that offer more power for less money. Users praise its durability, performance, and the legendary build quality, yet caution that premium pricing means you’re paying for a trusted name. Overall, the debate is peppered with sardonic nods to brand loyalty and the enduring allure of rock-solid reputation. In conclusion, if you’re chasing reliability and performance for marine audio systems, the TM400X4ad still earns its stripes despite a few naysayers. Our expert take? Recommended for those who want uncompromised marine sound and are willing to pay a premium for enduring quality.

Not for you? Check out our other rated Marine Amplifiers

Rockford and JL are the only amps I buy, expensive but worth it imo.

Positive Feedback

I like Hertz, Audison, Helix, Match, Morel, Kicker, Rockford, Alpine and DD Audio for amplifiers.

Insightful Chatter
Product
8.3
Rockford Fosgate TM400X4ad Power Marine 400 Watt Class-ad 4-Channel Amplifier
Buy on Amazon for $344
Boat Audio Systems
9 / 10
Marine Events
9 / 10
Watercraft Installations
9 / 10
Custom Marine Sound Systems
9 / 10
See how this compares to all Marine Amplifiers

What it does well!

Key strengths users can’t stop talking about.
Rockford Fosgate amps are reliable
“Rockford and JL are the only amps I buy, expensive but worth it imo.”➕
“I was pleasantly surprised to see that Rockford and JL are still king.”➕
“You can’t go wrong with JL, Rockford, Kicker, and Alpine amps for reliability.”➕
“Stay away from cheap stuff. Go with marine spec Kenwood, JL, Rockford Fosgate, Wet Sounds etc.”➕

Compare On All Talked About Dimensions

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Rockville RXM-S6 Marine/Boat 6 Channel AmplifierRockville RXM-S6 Marine/Boat 6 Channel Amplifier$199
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Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.
DIY audio installations and upgrade discussions
“DIY TJ Audio Project - Tonka has a secret: Aux Input into OEM Head Unit, with 100x4 Kenwood Marine M”➕
“I have complete clarity at 85+ mph.”➕
“It bumps hard, I'd definitely recommend the fosgate shallow 10.”➕
“That would have been A LOT easier!”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’
General amplifier upgrade experiences
“holy rollin jukebox batman. Love hearing the bike but being able to clearly hear good tunes at highway speed above the rumble is awesome.”➕
“Are those marine grade speakers?”➕
“I havent read of any problems with washes/rain.”➕
“I kind of regret it as far as value goes.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.
General amplifier brand mentions and recommendations
“I like Hertz, Audison, Helix, Match, Morel, Kicker, Rockford, Alpine and DD Audio for amplifiers.”➕
Bass Boost knob use can lead to distortion if misused
“If you simply add bass boost as in rotate the knob to random spot say 6'oclock and slam your system, yeah you'll have problems.”➕
“When tuned properly, you shouldn’t need the bass boost.”➕
“Bass Boost is usually centered around a specific frequency.”➕
“Boost compared to simply adding some gain through your EQ will cause distortion.”➕
General amplifier brand discussion
“I was planning on getting fosgate but i work in the marine industry, and my parts supplier sells Polk and clarion gear so i can get it cheap as shit as a dealer.”➕
“Awesome, thanks for the input!”➕

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