Specs Woofer : 6-1/2 Inch polypropylene copolymer, with a molded-rubber edge surround Tweeter : 1 Inch metal-dome aluminum alloy and gold-anodized nominal impedance : 8 ohms sensitivity : 89 dB sound-pressure level (SPL) at 1 meter with a 1-watt input. Recommended amplifiers rated : 20 and 100 watts per channel frequency response : 45 to 30,000 Hz within 3-dB limits. Cabinet finished : matched-grain wood veneer ( Santos rosewood ) Dimension (WxDxH) : 8-1/2 x 10 x 13-3/4 Inch Weigh : 8 kg.