The concept of this home-theater system is to provide 6.1-channels of surround sound by offering a Dolby-Digital compatible 6.1 channel surround sound receiver with 6 surround speakers and 1 powered subwoofer. You simply add a DVD player (or recorder), your TV, even a VCR, to experience exquisite surround sound for which Onkyo has received critical acclaim. This system delivers power using Onkyo's WRAT technology that consistently drives power over the complete acoustical frequency-range - 20 Hz to 20,000Hz. That means that 100 watts for each channel is used throughout the human listening range. Some home-theater systems hardly come close to those standards. If you're looking for a simple approach to setting up a home-theater and don't want to compromise on sound quality, this HTS680 is exactly what you need.192kHz/24-bit digital-to-analog converters for all channelsAdjustable Crossover (60/80/100/120/150 Hz)Digital AM/FM tuner with up to 30 station programmable presets32-bit DSP processingDigital Inputs -1 optical, 1 coaxial; 2 audio and 4 A/V inputs (3 S-video); 2 sets A/V outputs (2 S-video)2 sets of main speaker outputsReceiver Dimensions -17.13 W x 5.88 H x 14.5 DDrivers -Front L/R 4 Cone ( bass/midrange ) x 2, 1 Dome ( tweeter ) / Center 4 Cone x 2, 1 Dome / Surround 4 Cone, 1 Dome/ Subwoofer8 ConeConnect cables are included for 6 speakers and the subwoofer / A remote control is also included