MB QUART NA2-400.2 400W 2-Channel Amplifier for Polaris/ATV/UTV/RZR/Cart — Marine Grade

Overview: The MB QUART NA2-400.2 is a 400W, 2-channel Class D amplifier engineered for powersports and marine use. Designed to deliver compact, efficient power with corrosion resistance and flexible installation options, it’s suitable for Polaris vehicles, ATVs, UTVs, RZRs and carts. Marine protection & preamp: This amplifier meets ABYC & ASTM marine requirements and uses conformal-coated PC boards to resist salt spray and moisture. The built-in Q-Stasis pre-amplifier stage significantly reduces incoming noise from the source unit for cleaner sound reproduction. Inputs & connections: Inputs are provided as 1 pair of nickel-plated RCA jacks that are erosion resistant and high-temperature impact resistant, featuring hex screw terminals for secure attachment. Power and speaker connections use gold-plated terminals for corrosion resistance. The unit also offers quick-disconnect wires and RCA connections to make removal simple when storing or securing your machine. Operation & signal shaping: The amp operates in two-channel mode with the ability to run bridged mono when required. Signal control is provided by a switched FULL / LPF / HPF crossover arrangement, plus an electronic 12dB per octave crossover and selectable low pass at 300 Hz. Additional tonal controls include Bass Boost 0-12dB @ 45Hz and a 60Hz subsonic filter. Power architecture & cooling: A Full Range Class D topology provides a highly efficient power delivery. Output devices are driven by a PWM MOSFET power supply and a Simpatico dual-coil Pulse Width Modulated power supply that maintains stable voltage to the Ultra-Fi output stage. Heat is dissipated through an aluminum heat sink to support extended operation at lower impedances. Protection & diagnostics: The amplifier incorporates three-stage protection circuitry that monitors thermal, overload, DC, and speaker short conditions. Lighted indicators on the end panel report protection status. Key specifications: - Class: Full Range Class D - Variable Voltage: 0.2V~9V - Signal to Noise Ratio: >90dB - Frequency Response: 20Hz-20kHz - Crossover Type: Electronic 12dB Per Octave - Low Pass Crossover: Switch Low Pass 300 Hz - Bass Boost: 0-12dB@45Hz - Subsonic Filter: 60Hz - Power @ 2-Ohms: 2 x 200W - Power @ 4-Ohms: 2 x 100W - Total Channels: 2 - Audio Inputs: RCA - Power Terminal 12v/GND: Molex 10 ga - Speaker Terminal Wire Gauge: Molex Plug Connector - Fusing: 1 x 30 Amps - Certifications: Marine & Powersports - Dimensions: 3.70 X 5.51 X 1.77 in (9.4 X 14.0 X 4.5 cm) - Weight: 2.12 lbs (0.96 kg) Marinized/waterproof: Yes — engineered for water resistance and durability in demanding environments.