PSB Alfa B1 10.01.2012 in Posted in Архив / Неналични/Not available frequency response: 65-21,000 Hz (±3dB) sensitivity: 91 dB impedance: 6 ohms recommended power: 15-90 watts 3/4″ aluminum dome tweeter 5-1/4″ clay metalized polypropylene woofer bass reflex (ported) design