I've never heard about anyone using Q speakers for the L/R channel. Personally, I don't think it would sound right. Traditionally bookshelf, or towers for the front with Q's for the surrounds. I've heard that the QS8 sounds much better than the QS4. Go QS4 only if have to keep the cost down. Personally, I'd do without the QS4 until later and buy QS8 instead.