Package: Alpine PDX-V9 5-Channel 900 Watt RMS Class "D" Amplifier With Stackable Chassis Design + RUX-KNOB Remote Bass Level Control For PDX and MRP Mono Amplifier with 5 meter Connection Cable Alpine PDX-V9 5-channel car amplifier RMS Power Output: 100 Watts x 4 Channels + 500 Watts x 1 Channel at 2 or 4 ohms Stackable installation design with front-panel controls Alpine RUX-KNOB Remote Bass Knob Multiple Amp Control