Jak, that isn't what that "+" setting actually does. The LFE(i.e., low frequency effects occasionally present during movies)are played by the sub alone. If the M22s are set to play full range(probably not a good idea), then the "+" setting for the sub has it duplicating the low bass from the regular main channels, along with the main speakers. Probably you'll get better results by using the regular bass management, i.e., having the sub play the lowest bass while taking that burden off the M22s so that they can play the higher frequencies a bit more cleanly.
