Boston Acoustics GT-50 5-Channel Car Amplifier 45 Watts x 4 + 190 Watts x 1 5-channel car amplifier 45 Watts x 4 + 190 Watts x 1@ 4 Ohm 65 Watts x 4 + 250 Watts x 1@ 2 Ohm Frequency Response: 10Hz - 95kHz Signal Noise To Ratio: &gt;100dB