Compact, powerful, and discrete, the RetroSound® SUB8100 is the ideal solution to fill in the lower frequencies missing from your classic rides stereo system. The SUB8100 has a built-in Class D digital amplifier powering an ultra-thin 8” subwoofer in a rugged aluminum enclosure. With a low profile of 2.75 inches and a footprint of just 9.25 inches x 13.75 inches, the SUB8100 is perfect for trucks and other classic vehicles with no space for an amplifier and subwoofer set up. The continuous low-pass crossover and phase switch let you dial in the perfect amount of bass for your system, with remote gain control that allows for level adjustments on the road. Features 8-inch powered subwoofer Class D digital circuitry 100-watts RMS Built-in continuously variable crossover Remote gain control Advanced circuitry and thermal protection Easily connects to your RetroSound radio via RCA inputs Works with any aftermarket radio via high level input/wiring harness Rugged cast aluminum enclosure Dimensions: 9.25 in x 2.75 in x 13.75 in (23.5 cm x 7 cm x 35 cm) Power Usage Voltage 10.5-16 volts DC Idling Current (ON) 0.4 amps Idling Current (OFF) 100dB Input Sensitivity 100 mV-6V Frequency Response 35Hz-160Hz Total Harmonic Distortion 0.1% Filters Low Pass Filter/Slope 50Hz-100Hz/12dB/octave Phase Control (variable) 0º/180º Other Specifications Fuse 10 amps x 1 Size (W x H x L) 9 ¼ ” x 2 ¾” x 13 ¾” / 350mm x 70mm x 235mm Weight 9lbs / 4.08Kg