Q. How high up on the walls should I mount the surround speakers?
If you are using multidirectional, quad polar type surround speakers like the QS8s, generally from 12 inches to 5 feet above the level of your ears when you are seated will often produce the best sense of surround envelopment. Multidirectional surrounds like the QS8s or QS4s tend to be very accommodating and “unfussy” as to surround speakers placement and it isn’t even necessary to have them at identical heights or distances. Every room is different, of course, and some experimentation with a couple of stepladders to support the surrounds while you listen is useful. With direct-radiating surrounds, higher is usually better, but keep them at least 3 inches away from the ceiling to avoid boundary effects from the ceiling.