Cadence Acoustics Boston 1600 Watt Peak Class AB 5-Channel Amplifier Cadence Boston class AB 5-channel amplifier 75W x 4 + 250W x 1 @ 4 ohm RMS; 100W x 4 + 400W x 1 @ 2 ohm RMS; 200 x 2 @ 4 ohm bridged RMS + 400 x 1 @ 2 ohm RMS Frequency Response: 10Hz - 40 kHz Minimum THD: &lt;0.01%; S/N Ratio: &gt;100dB; Damping Factor: &gt;220 @ 100Hz; Channel Separation: &gt;65dB Dimensions (L x W x H): 20" x 7.25" x 2.25"