Citronic P44800 2U Rack Mount Stereo Sub Power Amplifier 2 x 400W + 800W SUB from Boxed2me at £489.02. P44800 amp 2 x 400W + 800W sub 2.1 power amplifiers with 2 channels for mid-top cabinets and a single high power sub output with integral active crossover. Designed as a cost effective and efficie