Bose Acoustimass 6 Series II Home Theater Speaker System (Black) (Discontinued by Manufacturer) 5 magnetically shielded cube speakers (each with a 2.5-inch driver) and a passive Acoustimass module (subwoofer) Hideaway Acoustimass module with 2 x 5.25-inch woofers fills out the system and your room with dynamic, full-bodied bass Works with Dolby/DTS surround receivers and power amplifiers rated 10 to 100 watts per channel (4 or 8 ohms impedance) Comes with color-coded speaker wires and error-proof connectors for a simple, accurate installation Automatic system-protection circuitry prevents speaker overload