I don't believe there would be any problem, whatsoever, using the QS4s with the 60s.
IMHO, the reason you don't see the QS4s in a package with the 60s is because of room size. It is assumed the 60s will be used in areas where the QS8s would be a better choice. On the other hand, many of us have the 60s and QS8s in rooms where the 22s and QS4s would work just fine.
If your room is small to medium, the QS4s will probably suffice. But, if your room is large, I suspect the QS8s would be a better choice. However, John's suggestion to give Axiom a call is a good one. They will not try to hype you into something you neither need nor want.
