5.1 channel home theatre system with Dolby Digital, Dolby Pro Logic II, and DTS Digital Surround decoders 3 optical, 1 coaxial input, analog 5.1 channel, and dual stereo inputs Wooden enclosures for all speakers effectively reduce resonance and vibration 10"(260 mm) subwoofer driver with twin bass reflex radiators 2-way satellite speakers with 3"(92 mm) mid-range drivers and 1"(25 mm) silk dome tweeters Professionally calibrated crossover in each satellite speaker Class D amplifier and DSP (Digital Signal Processing) technology