NA2-500.5

Compact Powersports Amplifier for Subwoofer Power

The MB Quart NA2-500.5 Compact Powersports Amplifier delivers efficient, reliable power in a space-saving design built for demanding environments. Engineered for subwoofer applications, this 400-watt mono-capable amplifier system provides strong bass performance while maintaining clarity and control.

Designed with a Class D full-range architecture, the NA2-500.5 ensures high efficiency and reduced heat output, making it ideal for motorcycles, ATVs, UTVs, boats, and compact vehicle installations where space is limited but performance is essential.

Its integrated design makes it easy to enhance low-frequency output without requiring bulky external components.

Advanced Audio Control with Built-In Tuning Features

The MB Quart NA2-500.5 Amplifier includes onboard tuning tools that allow users to fine-tune their audio system for optimal bass performance. It features a variable low-pass filter (50Hz–150Hz) and adjustable bass boost up to +12dB at 45Hz, giving you precise control over subwoofer response.

A built-in subsonic filter at 60Hz helps protect your subwoofer from damaging ultra-low frequencies, ensuring cleaner and safer performance during high-output playback. With RCA audio inputs and a wide 0.2V–9V variable voltage range, the amplifier easily integrates with factory and aftermarket systems.

The included bass remote control allows real-time adjustment of low-frequency output for on-the-go sound customization.

Durable, Marine & Powersports-Ready Design

Built for rugged environments, the MB Quart NA2-500.5 is certified for marine and powersports use, making it ideal for outdoor audio systems exposed to vibration, moisture, and harsh conditions.

Compact in size yet powerful in output, it features quick-release Molex connectors for simplified installation and maintenance. Its durable chassis and efficient cooling design help ensure stable performance during extended use.

With a total system output of 4 x 80W + 1 x 200W @ 2 ohms, this amplifier provides flexibility for multi-speaker setups while dedicating strong power to subwoofer channels for impactful bass performance.

Highlights

• 400W Compact Mono Powersports Amplifier System
• Designed specifically for subwoofer applications
• Efficient Class D amplifier technology
• 4 x 80W + 1 x 200W @ 2 Ohms output capability
• 4 x 40W + 1 x 100W @ 4 Ohms output
• Built-in low-pass filter (50Hz–150Hz)
• Adjustable bass boost up to +12dB @ 45Hz
• Subsonic filter at 60Hz for speaker protection
• RCA inputs with 0.2V–9V compatibility
• Includes bass remote control for real-time tuning
• Marine & Powersports certified for rugged environments
• Compact design with quick-release Molex connectors
• High signal-to-noise ratio (>90dB) for clean audio output
• Ideal for motorcycles, ATVs, UTVs, boats, and compact builds

Package Contains

• 1 × MB Quart NA2-500.5 Powersports Amplifier
• 1 × Bass Remote Control Knob
• 1 × Wiring Harness / Molex Connector Kit
• 1 × Mounting Hardware Kit
• 1 × User / Installation Manual
• Manufacturer Retail Packaging Box