Hi again,
As Sir Quack mentioned, tonally matched speakers all-round is most desirable, however, the surround speakers are much less critical in that regard. In my experience, M&K speakers are pretty neutral and good, so the QS8s should nicely blend with your front M&Ks.
By the way, in many respects, THX--at least for home aud
audio and home theater speakers -- is just a royalty-generating scheme for its founders. Some of the THX-endorsed brands of speakers I found quite colored and not neutral. (That is not true of M&K).
Regards,
Alan
