You would be better served looking at a pro audio site.
i.e.Yamaha or QSC powered speakers with 15inch woofers and possibly a sub.
Altec Lansing VOT solid state amp and solid state preamp.
You may want to divide the room if possible. I doubt if you will be experiencing any type of sound stage. That may not be that important.
BTW I have Yamaha DSR 15's ,2 FOCAL CMS subs that I am controlling with a Benchmark DAC 3 HGC ,OPPO CD player and Cambridge sound streamer.......Sounds great outside for party's or large indoor rooms ...I am not saying this is to die for. It sounds a lot better than you would expect of a PA system.
Good Luck