The 2.2 XP is equipped to generate separate outputs for 1 or 2 subwoofers. The room correction system generates very precise crossovers based on separate measurements of the main speakers and subwoofers. The filters will add up both in the time domain and in the frequency domain. Levels will automatically be adjusted and the appropriate delay to correct for speaker displacement will be imposed. Follow TacT’s advice regarding placement of subwoofers and you will experience a new level of dynamic accuracy and coherence. If you do not use the separate subwoofer outputs, then all of the processing power of the 2.2 XP will be used for the main channels.