MB Quart NA2-320.4 Marine 4-Channel Amplifier

Compact, Rugged & Powerful Marine Amplifier

The MB Quart NA2-320.4 is a compact yet powerful marine amplifier designed for boats, UTVs, and powersports vehicles. Delivering 320 watts of total power, this Class-D full-range amplifier is built with rugged, marine-certified components to withstand harsh elements like salt, water, and UV exposure.

🌊 Built for the Water — Marine Certified Design

Durable and Waterproof Audio Power

• Weather-resistant IPX-rated housing

• Heavy-duty aluminum heat sink for heat dissipation

• Conformal-coated PCB for marine-grade protection

• LED power and protection indicators

Whether you're on the water or off-road, this marine amplifier offers clean, reliable power in all conditions.

🔊 4-Channel High-Performance Output

Audio Power Specs

• 40W RMS x 4 @ 4 ohms

• 80W RMS x 4 @ 2 ohms

• Total Output: 320W peak

• Frequency Response: 20Hz–20kHz

• Signal-to-Noise Ratio: 90 dB

• Variable Bass Boost: 0–12dB @ 45Hz

Ideal for powering multiple marine speakers or small tower speaker systems.

⚙️ Advanced Class-D Amplifier Features

Precision Tuning & Protection

• Switchable high-pass filter

• Pulse Width Modulated MOSFET power supply

• Soft turn-on circuit to protect speakers

• Speaker-level inputs for flexible installation

• 3-way protection circuitry: thermal, overload, and speaker short protection

• Fuse Rating: 30A x 1

This amplifier packs top-shelf tuning features in a marine-friendly compact design.

🧰 Compact Size for Tight Installations

• Dimensions: 3.7" (W) x 5.51" (L) x 1.77" (H)

• Mounts easily under seats, dash, or storage compartments

• Requires 10-gauge wiring (sold separately)

Need help with installation? Contact Audio Jam for expert service and bundle discounts on amplifier wiring kits.

🔧 Ideal for Marine & Powersports Applications

Whether you're upgrading your boat stereo system or adding power to your UTV marine speaker setup, the MB Quart NA2-320.4 delivers clean, distortion-free amplification without sacrificing space or reliability.

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