Rear ports are good. You can probably combine the drivers in groups and make chambers for each group to make the port design more friendly, ie.. I build my budget array with four chambers, four drivers per chamber, a 6" diameter rear port per chamber, 1 3/8" port length. Turns out, the wood thickness of that rear wall is 1 3/8" so the port length = wood thickness so all I did was cut a 6" hole in the back of the cabinet and used a small roundover bit on the edges. Obviously, this design is tuned higher in frequency.
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