Overview

Small amp. Big upgrade.

The Rockford Fosgate TM400X4ad is a compact 4-channel amplifier built for motorcycles, marine, and powersports. It’s designed to deliver consistent power, clean signal, and reliable performance—even in tough environments.

What It Is

A compact, high-efficiency 4-channel amp.

• 400 watts total power
• Class-AD technology with Constant Power output
• Built for motorcycles, boats, and off-road vehicles

Perfect for powering a full speaker setup without taking up space.

Performance

This amp punches above its size.

• Delivers consistent power at 2Ω and 4Ω
• Clean, stable output across all channels
• Bridgeable for flexible system setups

Great for fairing + bag lid combos or full bike systems.

Smart Integration

Built to work with factory or aftermarket systems.

• High-level and low-level inputs
• Auto turn-on with high-level input
• 2-channel / 4-channel input switch
• Remote-out feature for system expansion

Makes installs cleaner and easier.

Tuning & Controls

Everything you need right on top.

• Built-in crossovers
• C.L.E.A.N. clip detection (input & output)
• Easy-access top-mounted controls

Dial it in without digging into the install.

Built to Last

Designed for harsh environments.

• Element Ready™ design
• Marine-grade epoxy-coated circuit boards
• Dual fan cooling system
• Real-time thermal and protection monitoring
• Dual extruded heat sinks

This thing is made to survive.

What’s Included

• TM400X4ad Amplifier

Specifications

Power Output:

• 400 Watts Total

Channels:

• 4-Channel

Technology:

• Class-AD with Constant Power

Impedance Stability:

• 2Ω & 4Ω (same power output)

Bridging:

• 4Ω bridged capable

Inputs:

• High-Level (speaker)
• Low-Level (RCA)

Cooling:

• Dual fan forced induction
• Dual heat sinks

Quick Questions

Q: Is this good for motorcycles?
A: Yes—this is one of the go-to amps for Harley setups.

Q: Can I run front and rear speakers with this?
A: Yes—perfect for a 4-speaker setup.

Q: Does it work with factory radios?
A: Yes—thanks to high-level inputs and auto turn-on.

Note

• Proper wiring and tuning recommended for best performance
• Designed for powersports and marine use