ST-105D BT - Zapco Bluetooth 5-Channel 1,070W RMS Class D Full Range Amplifier 5-Channel Class D Full Range | Micro Chassis | 1,070W RMS | 180W x 4 + 350 x 1 at 2-Ohm Bluetooth Music Streaming | Variable Electronic Crossover | Variable Bass Boost | Internal Mono Bass Amp | 2Ch, 4Ch, 5Ch Input Mode Selection RMS Power/Channel at 4-Ohms: 90W / Ch x 4 + 250W | RMS Power/Channel at 2-Ohms: 180W / Ch x 4 + 350W | Bridged at 4-Ohms: 360W x 2 + 350W Efficiency: 90% | Frequency Response: 10Hz~22KHz | THD at Rated Power: 85dB | Tested Voltage: 14.4V | Channel Separation: 50dB | Recommended Fuse Rating: 90 Amps RCA Input Sensitivity: 220mV~6V | Dimensions: 6.3" W x 2.05" H x 13.39" L