Wayne ... Then can I ASSume that by not using the 12PI my original idea to use Pro 7's is the best way for reasonable deep bass with authority? If I must relinquish corners for side wall placement, will I loose much in low frequency and quality? Would you be kind enough to explain different placements for them? A 70hz cutoff gives me almost 8' distance to UB to play with. Thinking of two side by side against rear wall. Only have 6' width there between doors, but would be within 3' of corners. Zene