Power: 140 watts RMS for the Premier Twelve, 60 watts RMS for the Premier Twelve-XS, into 4 ohms from 30Hz to 15KHz at no more than 1% total harmonic distortion or intermodulation distortion. Sensitivity: 950 mv to full power. Small Signal Distortion: Less than .1% at midband Phase: Phase correct (non-inverting) Frequency response: 20Hz to 20KHz +0, -.5dB Hum and noise: 98dB below full power output. Input impedance: 100K ohms. Dimensions: 15D x 17.5W x 7.25H inches Weight: 48 lbs.