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Oh, I put this under my rear seat and it was setup up for dual 10" sealed type down-fire subs. But the polk MM1040's in it require a minimum of 4.5 for top mount and I think that is what the available space for internal clearance was and it met the cubic displacement requirements. Absolutely no complaints from me on sound quality of the setup except that the vehicle itself buzz's to much at times if I turn the the bass up midway thru the head unit control. I assume you went for a somewhat ported enclosure from the look of the size of that thing.
HiDo you have the link where I can purchase this enclosure?