BOSS Audio MC900B 4-Channel Amplifier – 500W Max, Weatherproof, Full-Range Power for ATV/UTV/Marine

Meet the BOSS Audio MC900B — a rugged 4-channel amplifier built for adventures beyond paved roads. Designed to survive dusty trails, choppy waters, and outdoor elements, this unit streams music directly from Bluetooth, a USB-connected device, or an auxiliary source, so you can enjoy your favorite playlists without needing an in-dash head unit. Its compact footprint hides powerful performance, making it a versatile upgrade for ATVs, UTVs, cars, and boats.

Power and sound you can feel

The MC900B is a Class AB amplifier engineered for full-range output, delivering up to 125 Watts Max per channel and 94 Watts RMS per channel at 4 ohms. This 4-ohm stability means you can run multiple speakers and even subwoofers to shape your listening experience on the move. With a slim profile (1.75” tall, 6.6” long, 1.75” wide) and a weight of about 2.9 lbs, it easily fits into tight compartments while still delivering meaningful audio impact.

• 125 Watts Max x 4 channels @4 Ohms
• 94 Watts RMS x 4 channels @4 Ohms
• Full-range output for speakers and subs
• Compact dimensions and lightweight design

Connectivity, control, and convenience

Designed for versatile setups, the MC900B keeps you in control without a dedicated head unit. Use the auxiliary input to connect phones or MP3 players, stream Bluetooth audio with the included remote control, or charge USB devices on the go. The inline multi-function remote adds convenience, so you can adjust playback from your seat or saddle.

• Auxiliary input for smartphones and MP3 players
• Bluetooth streaming with a remote for easy control
• USB charging port to power devices during adventures
• Inline remote control for quick adjustments

Durability and outdoor-ready design

Weatherproof connectors help protect against corrosion and exposure, making the MC900B a practical companion for ATVs, UTVs, boats, and other outdoor setups. While a professional installation is encouraged for the best performance and safety, the unit’s compact form supports discreet mounting in several vehicle styles. And when you purchase through Amazon, you can access a powerful 6-year Platinum Online Dealer Warranty for added peace of mind.

• Weatherproof connectors for light weather and outdoor use
• Weather-ready design suitable for rugged environments
• 6-year Platinum Online Dealer Warranty with Amazon purchase
• Professional installation recommended for optimal results

Real-world use scenarios

On dusty trails, by the water, or during a weekend project, the MC900B can support a range of audio configurations without the need for an internal head unit. Its full-range capability paired with robust power can help you create a balanced, immersive listening environment that complements your ride or work day. The combination of Bluetooth streaming, AUX input, and USB charging provides flexible listening options wherever your adventures take you.

Possible setups include a compact speaker array for clear on-ride audio, or a small subwoofer to add depth to your outdoor soundtrack. The result is a practical, upgrade-friendly audio solution that respects power usage while offering meaningful enhancements to your mobile sound system.