4 ohm 4 x 50 watts RMS (400 watts MAX) Bridged 2 x 150 watts RMS (600 watts MAX) Bass boost @ 80hz +12db. Channel 1-2 Low pass filter 80 - 1,200hz. High pass filter 80hz. Channel 3-4 Low pass filter 50 - 150hz. High pass filter 80hz. Superb quality, reliability and performance. Normal in store price £184.95. This was are ex-demo model, hence price.