Power Requirements: 14.4 V DC (11 V to 16 V). Input Sensitivity: 0.2 - 8.0 V. Frequency Response: 5 Hz - 50 kHz (+ 0,-3 dB). Speaker Impedance: 4 or 2 ?. Signal to Noise: S/N Ratio (IHF A Weighted, Reference: rated power into 4ohms) 95 db. Features: 4 Gauge 4 Channel Car Amplifier Wiring Installation Kit. 17 High Grade RCA Cable. 17 4 Gauge Translucent Blue Super Flex Power Cables. 17 18 Gauge Blue Remote Cable. 17 16 Gauge Clear Speaker Wire. 3 4 Gauge Clear Super Flex Ground Wire. Gold Plated AGU Heat Resistant Fuse Holder. 80 Amp AGU Gold Plated Fuse. 7 Split Tube Loom. Accessories Included: Wire Ties, Ring Terminals, Butt Connectors, Spades, and Grommets. Soft abrasion proof insulating jacket allows for 100% improved flexibility. PVC outer jacket can with-stand an extreme temperature range of -40 to 220 degrees F This new BBX amplifier gives you Alpine power performance at an amazing price. And there designed to fit easily in virtually any system. The Rockville RWK42 4 AWG (American Wire Gauge) amp kit has the following differences over other amp kits on the market at this price point.