Help: Speakers to fill Exceptionallly Large Room?


I'm trying to outfit a large coffeebar with a decent pair of speakers or monitors on a budget. The room is approximately 20 feet wide by 80 feet deep. My current plan is to place one speaker at the front of the space aiming at the bar and a second about half way through the space, again, aiming at the bar. Everything beyond the second speaker will be a "quiet" space for all intents and purposes.

Rules are that I cant use more than two speakers and they have to be wall mountable. I'd like the place to sound good, though I know it will be no acoustic dream, by far. Price range is probably $500-600, $1000 max. Should be relatively efficient, because I'll need some db's to fill the space. Any help appreciated. Thanks.
jaminsky
I can recommend Altec Model 19s. They are large, informal, decent-looking, very efficient, have a long "throw", are dynamic as all get-out, are only somewhat difficult to find, and have good resale value. They can be found in 'beat-up" condition (which will be in your budget) or absolutely mint (which probably won't be), and don't sound tremendously different either way, and can be "restored" from beat-up to OK-looking with a bit of wood-finishing (but one has to be sure the woofers/drivers are OK). They tend to roll off a bit in the treble, and they don't do 20Hz at the bottom end, but for a cafe, that's probably better in both cases.
Bose 901s efficient? News to me but they must have changed during the years. The originals were notorious for their INEFFICIENCY. No surprise as they were based on table radio speakers equalized so that their midrange was suppressed to the level of their treble and bass. Anyone familiar with the response curve of typical small single cone drivers will appreciate what is required to do this.
The Bose 901s hanging from the ceiling is a great idea as critical listening isn't going to happen in this setup anway. I had a pair hanging in a basement 20 years ago. They could fill the place with sound.
Stanwal,

Beginning with the Series 3, the 901s could be driven to very high volumes with a good 75w/ch receiver. They do require use of an equalizer (included) that runs through a tape loop. Finding a modern receiver, integrated amp, or preamp with a tape loop could be challenging.