Sundown Audio SDX-400.1 400W Marine-Grade Powersports Audio Amplifier/Amp

Sundown AudioSKU: A-SDX400

Sale price$229.99
In stock


Moderate power, tiny size, but at the top-end of Full-Range Class-D fidelity. The controls will have a removable cover that bolts down on top of them. The overall case is a big chunk of cast aluminum to keep temperatures in check!

Product Manual


  • Digital Class-D Mono Block Amplifier
  • Dual MOS-FET PWM Power Supply
  • 1 Ohm Stable Load
  • 12 dB/Octave - Variable Low Pass Filter
  • DC Auto sense feature
  • 0 to 12dB - Variable Bass Boost
  • 4 Way Protection Circuit (Thermal, Voltage Speaker short and DC Offset)
  • Wired Remote Control


  • Mono Block Class-D Amplifier
  • 1 x 400W at 1 Ohm
  • 1 x 300W at 2 Ohm
  • 1 x 175W at 4 Ohm
  • Recommended Fuse Rating: 40A
  • LoW Pass Filter (-12dB/8) Variable: 50hz-250hz
  • Input Sensitivity: 6V Max
  • S/N: >90dB
  • Cast Aluminum Heat Sync
  • Water Resistant
  • Highpass / Lowpass / Bandpass Filter
  • Gain Adjustment 
  • Suitable for vehicles with start / stop function
  • Dimensions in mm (LxWxH): 147 x 102 x 54 mm

Note: Unscrew the badge using an allen key to access audio settings.


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