The Boss R1004 4 channel amplifier features a MAX power handling of 400 watts and a RMS power handling of 50 watts. The Class A/B circuit design runs cooler and more efficiently with low distortion and high reliability. This class is intermediate between Class A and B, with the two active elements conducting more than half of the time which are best used for speakers. Other features include a Hi/Low pass crossover, a variable bass boost and is 2-ohm stable. Trimode Capable 2 Ohm Stable Signal to Noise Ratio: >95 dB KIT2 Complete your car audio set up with ease thanks to the included BOSS Audio Systems KIT2 8-Gauge Complete Car Amplifier Installation Wiring Kit. The Boss KIT2 8-Gauge Complete Car Amplifier Wiring Kit has everything your need to wire your car audio system. This wiring kit features a 20-foot, 8-gauge red power cable, competition high-quality fuse holder, 3-feet of 8-gauge black ground cable, 16-feet of 18-gauge blue turn-on wire, a 20-foot high-performance RCA interconnect, 30-feet of speaker wire, 6-feet of split loom tubing, (20) 4-inch wire ties, (3) rubber grommets, a #10 ring terminal, a 5/16-inch ring terminal, and a 1/4-inch ring terminal. Give your car audio system the best wire available and get your system up and running with the BOSS KIT2 8-Gauge Complete Car Amplifier Wiring Kit.