Speaker recommendations for new venture

If it's really a single, integrated space, it's hard to believe that one pair of speakers is the best solution. Since SPL falls off at a square of distance - folks sitting 15 feet from the speakers are going to experience something quite different from those sitting 50 feet away.

You might consider running your stereo input from the preamp into that ATI four channel amp and coming out full range into two pairs of stereo speakers spaced at thirds along the 90' wall. I'd have to think that's a more workable solution for most applications.

Duke,

While I completely agree that reverberant sound will mitigate the delta in SPL (from near field to distant listening), I don't think that's the relevant question here. The real question is: Will it mitigate the delta enough to be the optimal solution for the OP's application?

In almost every large commercial space that I can think of: Nightclubs and bars, restaurants, gyms, hair salons, retail stores, etc. - the preferred solution is multiple speakers. Shy of a combination retail/performance space (or possibly a pro-sound store), I'd think that very few retail businesses operating in anything like the OP's 90' by 24' room that would be best served by a single set of stereo loudspeakers - even if the power response of the speaker is essentially perfect over a very wide window.

According to the OP, he is not selling audio equipment. I am curious, are you suggesting that you think a single pair of loudspeakers is likely to be his best solution?