1.1CUft seems VERY small for a bandpass enclosure with a 12" sub. My 12 mules call for .75-1 Cuft for sealed, the smallest of all the types of boxes, and most subs require 1-1.5 for sealed and around 3 for bandpass. Have him chekc that to be sure. but .1 cuft isnt THAT big of a deal IMO. BTW, foam filling is used usually to make a sub think a box is bigger(i think thats what it does, lol)
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