RetroSound's Technophnic 5-channel amplifier delivers 60 watts x 4-channels plus 200 watts x 1 channel of pure Class D digital power. This 5-channel design makes the Stereophonic ideal for building a complete audio system -- you can run front speakers and rear speakers plus a subwoofer from the amplifier. It has a built-in variable electronic cross-over to fine tune your system. It has a subsonic filter, which prevents the amplifier from producing low frequencies outside the hearing range, thus improving amplifier performance. Stereophonic's diminutive size (it measure just 12 x 5.25 x 2 inches) allows installation almost anywhere, including under most vehicle seats. It has molded terminals for power, ground, remote turn-on and speaker connections.