The QS8s have the full 1" tweeter like the M22. The QS4s have the smaller tweeter but it should be kept in mind that the smaller woofers on the QS4s takes some of the load off the tweeters. You will have a bit of sonic loss and efficiency loss but I do not think this is worth worrying about for the gains you will get by using the QS4s.

Ian Colquhoun
President & Chief Engineer