Zapco ST-4X SQ 4-Channel 380W RMS Class AB Amplifier 4 Channel Class A/B Amplifier | Power Rating: 4 Ohms: 65 Watts X 4 Chan. | 2 Ohms: 95 Watts X 4 Chan. | Bridged, 4 Ohms: 2 X 190 Watts Tiffany style Panel Mount RCAs | SQ Upgrades: Op-amps, Caps, Etc. | Signal-to-nose ratio: &gt;98dB THD + Noise 60dB | 12dB HP/LP/Full Pass Crossover RCA and Speaker Level Inputs | Variable bass boost control | Frequency Response 15Hz to 30KHz 1dB Input Sensitivity .25v to 5v | Compact chassis | Dimensions: 6.29"(W) X 12.6"(L) X 2"(H)