Soundstream TA5.1250D 5-Channel Hybrid Amplifier 5 Channel Amp with 2-Ohm Stereo 4-Channel X 125 Watts RMS and 1-Ohm Stable Class D Monoblock with 750 Watts RMS Variable 12dB High, Low, Bandpass & Subsonic Crossovers Input Source Selector ( Dash Mounted Remote Gain Control Delayed On/Off Circuit