SUNDOWN AUDIO SFB-500.4D 4 CHANNEL CLASS D AMPLIFIER FEATURES: High Efficiency Digital Multi-Channel Design 12 dB/Octave – Variable Low Pass Filter 12 dB/Octave – Variable High Pass Filter Variable Bass Boost Clipping Indicator 4 Way Protection Ciruit (Thermal, Voltage, Speaker Short, DC Offset) Optional Wired Remote Control with Clipping Indicator SPECIFICATIONS (Tested @ 14.4v): 1 ohm RMS: 500W / CH 2 ohm RMS: 300W / CH 4 ohm RMS: 200W / CH Recommended Fuse Rating: 180A Low Pass Filter (Variable): 50Hz-6kHz High Pass Filter (Variable): 15Hz-6kHz Bass Boost @ 50Hz: 0-12dB Input Sensitivity: 5V Max S/N Ratio: 100dB Working Voltage: 10.5v-15.5v Dimensions: 8.25 x 9.75 x 2.75