@neveo: Looks like you may have an almost perfect sized room, however you need to cover the glass and the concrete. You can often buy high end speakers, that were used as demos-I did. I think your amps have plenty of power, as long as the signal is clean. The benefit of having a large room is, your low frequencies have a chance to form. Space your speakers out from the side walls and front wall several feet, placing your listening chair out the appropriate distance. Leave the space in your listening triangle free from any tables, etc, and according to me and many, place your gear on one of the side walls-not in between or behind your speakers. You should have several feet behind your chair. Incorporate diffusion and absorption on all walls, as well as ceiling. Dennis Foley and Jim Smith gives excellent advice on this subject.