Fusion MS-AM504 4-Channel Marine Class AB Amplifier, 500W

Fusion MS-AM504 – 4-channel marine class AB amplifier, 500 W

Fusion MS-AM504 is a 4-channel marine class AB audio amplifier with a maximum power of 500 W, specially designed for onboard use on watercraft. Its robust construction resistant to marine environmental conditions and high sound quality make it an ideal choice for stereo systems and multi-zone sound systems on yachts, motorboats, and recreational boats.

Key features:

Amplifier type: class AB

Number of channels: 4

Peak power: 500 W

RMS power:

4 × 65 W RMS at 4 Ohm

4 × 100 W RMS at 2 Ohm

2 × 200 W RMS at 4 Ohm (bridged)

Frequency response: 20 Hz – 20 kHz

Signal-to-noise ratio (SNR): >95 dB

Output impedance: 2–4 Ohm

THD (total harmonic distortion): <0.1%

Marine resistance:

Compliance with standards:

ASTM B117 (salt fog resistance)

ASTM D4329 (UV resistance)

Enclosure: anodized aluminum, corrosion resistant

PCB coating: epoxy, moisture protective

Protections: short circuit, overload, temperature

Mounting location: dry ventilated space (inside hull)

Inputs and control functions:

Signal inputs: RCA (low-level)

Remote control: REM wire

Adjustments:

Gain (signal amplification)

Low-pass filter (LPF)

High-pass filter (HPF)

Operation modes: 4/3/2-channel, e.g. 2 stereo speakers + subwoofer (bridged)

Power supply and protections:

Power supply: 10.5 – 16 V DC

Current consumption: up to 25–40 A (depending on load)

Fuse: 1 × 40 A (external required, not included)

Dimensions and mounting:

Length: 280 mm

Width: 200 mm

Height: 60 mm

Weight: approx. 2.0 kg

Mounting: horizontal, inside the unit (protected ventilated area)

Applications:

Powering 4 stereo speakers in two zones

2-channel configuration + subwoofer

Operation in Fusion systems with head units (RA70, RA210, BB100, Apollo Series)

Installations in recreational boats, sports boats, motor yachts, and RIBs

Package contents:

1 × Fusion MS-AM504 amplifier

Mounting kit

User manual

Manufacturer's warranty: 1 year

Fusion MS-AM504 is a classic, proven marine class AB amplifier that balances sound quality and durability. With four channels and bridged operation capability, it works well in both simple stereo systems and more complex multi-zone setups.