Sundown Audio SDX-100.4 4-Channel Weatherproof Amplifier Subwoofers/Sub and Box Packages and material were all chosen

and material were all chosen to create the least amount of breakup and distortion as possible

look no further than the SFB Series from Sundown Audio

selectable high pass

Covered in tough

Sundown Audio SDX-100.4 4-Channel Weatherproof Amplifier Subwoofers/Sub and Box Packages and material were all chosen270 x 2 @ 4 ohms RMS Bridged 135 x 4 @ 2 ohms RMS 100 x 4 @ 4 ohms RMS Variable 12dB high pass filter: 15Hz 500Hz or 300Hz 10kHz (Ch. 1 2) Variable 12dB high pass filter: 15Hz 500Hz (Ch. 3 4) Variable 12dB low pass filter: 30Hz 500Hz or 600Hz 10kHz (Ch. 3 4) x1 x20 crossover frequency multipliers Variable 12dB bass boost @ 50Hz DC auto sensing turn on Thermal, voltage, speaker short, and dc offset protection circuitry Water resistant Heavy cast