I'm sorry but I am a little lost on this post.

We are talking about "entry level" B&W speakers aren't we? This aren't 800 series or even CM series. There just 6 series speakers.

Unless its a huge space and you need gobs of power I think the customer would be a lot better off getting a higher end av receiver or lower end separates ath most. He would be better of spending that money on better speakers or using multiple subs.