Em, there's no good reason to be sorry that the M22s don't provide for passive bi-amping(or biwiring)since it has no significant benefits. Each channel of the amp still carries a full-range signal and each section of the speaker still has only the power of one amp channel available. For example, if two 100 watt channels were involved in a passive bi-amping arrangement, each speaker section would still have just the original 100 watts available, not 200 watts. As Will pointed out, you're already receiving the advantages of a form of active bi-amping when you use the bass management of your receiver to send separate frequency ranges to the sub amplifier and the speaker amp channels of the receiver. As far as the review in Ultimate AV, I can't find that comment to be any more credible that any other audio illusions we often read about.
