Taramps TS-250.4D 250 Watts-RMS Compact Car Amplifier Full Range 4-Channels Class-D 2-ohm Stable Max power @ 13, 8 VDC -2 ohms: 252W RMS (4 x 63W RMS); Max power @ 13.8 VDC - 4 ohms: 144W RMS (4 x 36W RMS); Max power em Bridge @ 13.8 VDC - 4 ohms: 252W RMS (2 x 126W RMS) Channels: 4, input sensitivity: 320Mv (vole =Max), input impedance: 22K ohms, Signal-to-Noise ratio: &gt; 90Db Frequency response (full range): 10Hz - 30Khz (-3Db) Min. Supply voltage: 9VDC, Max. Supply voltage: 16VDC, Idle consumption: 0.55a @ 13.8VDC, musical Max consumption: 11a @ 13.8VDC Protection system: temperature, short circuit