... excellent sound and reasonable price. good quality best service 5.1 Home theater speakers Specifications:Control Panel Volume +/-, bass, treble, balance Speaker ... Unit:subwoofer: 5.25", 4Ω satellite: 2.75" x 5, 4ΩOutput ... best serviceOur certifications :CE/ROHS/FCC/CCC/ISO9001/UL 5.1 Home theater speaker system