Frequency response 20-Hz-150Hz 380 watts into 4ohmsHigh level input impedance: 15KohmsLow level input sensitivity: 250mw full output, 100HzFeatures auto on-off and phase control and compact chassisSA-380: 17" W x 1 1/2" H x 11 1/2" DSA-180: 8 1/2" W x 2" H x 12 1/2" D