I got back home last night, so I'll definitely take a closer look at some of these suggestions and how exactly my projector is vibrating. The replacement EP800 and new amp for sub #2 is here, so I could temporarily hook 3 EP800's up to really see if I can make it shake! \:\)

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7