Scott, the QS manual also states that rear wall placement is effective. The main point is that the surrounds in a 5.1 setup are side surrounds, not back surrounds, but placement on the back wall spread almost(say 6" away)to the side walls gives a mainly side surround effect when the listening position is almost up against the back wall. Placing the QSs there and about 2-3' above ear level gives excellent results, with them adding a little phantom back surround effect in the absence of actual back surround 7.1 speakers.
