MB Quart - NA4-400.2RC Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM, (Polaris® RIDE COMM - Black/Gray
Model: NA4-400.2RC
SKU: 12357557
Reviews coming soon
Reviews coming soon
The MB Quart NA4-400.2RC Nautic is a compact 2-channel amplifier engineered for reliable performance in marine and powersports environments, with direct compatibility for Polaris® RIDE COMMAND® systems. Built around an efficient Class D design, it delivers up to 400 watts of total power while maintaining a small footprint that fits easily into tight installation areas. Durability is a core focus, with IP67-rated waterproof and dustproof protection and fully potted internals that seal critical components against moisture, vibration, and corrosion. This construction makes it well-suited for harsh outdoor conditions where traditional amplifiers would be vulnerable to failure. An aluminum heatsink further enhances reliability by efficiently dissipating heat during extended use. On the performance side, the amplifier features MB Quart’s Q-Stasis low-noise preamp circuit, which reduces incoming signal noise and improves overall clarity. With a frequency response of 80Hz to 20kHz and a signal-to-noise ratio greater than 105 dB, it is optimized for clean midrange and high-frequency reproduction. A fixed 80Hz high-pass crossover (12 dB/octave) simplifies setup while helping protect connected speakers. Installation is streamlined with quick-connect power, speaker, and RCA terminals, along with corrosion-resistant nickel-plated connections for long-term reliability. Integrated protection circuitry monitors thermal, overload, DC, and speaker short conditions, with LED indicators providing system status at a glance. Specifications Model: NA4-400.2RC Channels: 2 Amplifier Class: Class D (Full Range) Max Power: 400W Power @ 4 Ohms: 2 x 100W Power @ 2 Ohms: 2 x 200W Frequency Response: 80Hz – 20kHz Signal to Noise Ratio: >105 dB Total Harmonic Distortion (THD): 1.0% High Pass Crossover: Fixed 80Hz (12 dB/Octave) Input Sensitivity: 0.2V – 9V IP Rating: IP67 Fuse Rating: 30A x 1
2-channel Class D amplifier delivering 400W max power with 2 x 100W @ 4Ω and 2 x 200W @ 2Ω output
IP67-rated waterproof and dustproof design with fully potted internals for marine and powersports durability
Fixed 80Hz high-pass crossover with 12 dB/octave slope for optimized speaker protection and tuning
80Hz–20kHz frequency response with >105 dB signal-to-noise ratio for clean, mid/high-range audio performance
Polaris® RIDE COMMAND® compatible with RCA inputs and 0.2V–9V input sensitivity for flexible integration
We’ll try to get your question answered within 24 hours by a Best Buy customer or brand representative.
Learn more >