Alpine SBR-S8-4 R-Series 8 Inch Truck Bass package with S-A60M amplifier, bass knob - This bundle includes a Alpine SBR-S8-4 Type-R 8 (SWR-8D2, 4 Ohm) Enclosure System, the Alpine S-A60M Mono Digital Subwoofer Amplifier, the Alpine RUX-KNOB Remote Bass Knob, relevant wiring, and a Creative Alpine coozy. Alpine SBR-S8-4 Type-R 8" (SWR-8D2, 4Î©) Enclosure System Loud, Clean Bass That Fits Anywhere The SBR-S8-4 8â Enclosed Subwoofer lets you add deep, accurate bass to your sound system without taking up much space in your vehicle. Amp it up 350 watts of RMS power handling make the SBR-S8-4 compatible with a wide range of mono and multi-channel amplifiers. For example, hook it to the subwoofer channel on the 5-channel Alpine MRX-V60, or connect it to two bridged channels on an Alpine MRX-F30â¦either way youâll get great low-bass performance. Alpine S-A60M Mono Digital Subwoofer Amplifier - 600 Watts x 1 @ 2-Ohms & 330 Watts x 1 @ 4-Ohms The S-Series amplifiers were designed to perfectly complement the already established and loved S-Series speaker and subwoofer line that Alpine Electronics has continually improved for years. The S-Series Amplifiers have a diagnostic LED located behind the blue Alpine Jewell on the top of the amplifier. A Blue light means the amplifier is operating normally. A red blinking light means the amplifier is currently too hot for operation and needs to cool down. A solid red light can mean three things; 1. Amplifier circuit is abnormal. 2. Temperature is too high. 3. Power supply voltage is too high. Alpine RUX-KNOB Remote Bass Knob With the RUX-KNOB installed inside the vehicle cabin, easily adjust the bass gain of your amp while seated inside. Control multiple amps from just one RUX-KNOB controller â with the use of simple telephone cord adapters (which are readily available at many retailers).