Mike, there's no "void". The M22 enclosure is tuned to about 59Hz(low point in the impedance curve)and the response is quite strong to at least that frequency. The auto-calibration resulted in a 60Hz crossover, which I manually reset to 80Hz, so as to give the EP500 more to do in the range it does best. Certainly with a setting of 80Hz, there's no weakness in either the sub or the mains in the crossover area. If a specific location in a particular room had a room acoustics problem there, it would affect any speaker similarly placed.
