rod gervais

Moon, I agree that you need bass trapping - probably low, mid and high trapping in fact. Ethan weiner has some plans for home built traps - and also manufactures (at Real Traps) standard bass traps as well as mini traps...... Artt's observations are very accurate - although i would suggest (to quote Ethan) that a corner is a corner is a corner is a corner....... - and bass doesn't know the difference between corners at walls and corners at wall to ceiling. You can decrease the effects of peaks/nulls with Low Bass corner traps at any of the room corners..... and probably some mids and highs in other locations. I also think you want to consider taking your sweet spot and looking for reflection areas off the walls and ceiling - Artt is also correct about the problems these cause with properly hearing the stereo effects that have been programned into the system. The potential for phase problems with the extra speakers you've added also have to be considered. Phase cancellation with speakers that close together sending the exact same signals can be a real issue. A couple things you need to understand - more is not always better....... and what seems intuitive - even common sense - doesn't necessarily work in acoustic design..... One comment - shy of doing things like moving the seats forward - moving the doors - those types of suggestions that have been made...... you are never ever going to get the back of the room to sound like you probably want it to. So settle for making the sweet spot the best it can be and live with whatever is left. By the way - i mention Real Traps not only because i know Ethan (he is a freind and co-moderator at RO)- but also because at least this way you can get some competative bids for comparision purposes. Rod By the way - it's nice to meet all the rest of you. This is a great forum.....