" AK 4050 RMS POWER @ 4 OHM : 50 W?CH BRIDGE MODE POWER @ 4 OHM : 130 W?CH THD @ 4 OHM : < 0.1 % S/N (A-WEIGHTED) : > 90 dB INPUT SENSITIVITY : 0.15 ?2 V FREQUENCE RESPONSE :20 HZ?0 KHZ DIMENSION : 208(W)?76(L)?2(D) mm "