AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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What does the wall being concrete have to do with anything? No matter what the wall is constructed with has no bearing on how deep a speaker is.
I personally would not make any speaker box less than 5" deep, so most any midrange driver will work.
Custom, one of a kind pair, MJC212 mains, mod PT800 center, PT800 surrounds, SUB1500s. Parasound P7, Citation 19, Parasound HCA2205A, HK AVR3600, Marantz TT, Denon disc player, MacBook Pro w/ DragonFly usbDAC.