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I built an irregularly shaped subwoofer enclosure out of MDF and
fiberglass.

It is just a little bit under the ideal volume for the subwoofer.

Could I just drill a hole in the side of the box and add a foot of 2"
PVC pipe (capped off and sealed) jutting out of the subwoofer
enclosure and under the seat of the truck?

I know they say that volume of air is all that matters, but what if
the air is in a pipe sticking out of the box?

I'm interested in your thoughts. Thank you in advance and have a
lovely day.