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Square vents sound like ass without smoothing the corners ~ at least run some 45* strips of that MDF down the edges.
Also, you absoultely need at least one port diameter (in your case, 3.5" * sqrt(2)) of space on both ends of the port ~ it looks like you obstruct it internally with that brace, but much more dramatically with the port facing right into a plastic interior panel, unless thats the port in the corner there, in which case you need to clean up that 90* transition.
With vented boxes you have to realize that a lot of your SQ (and a decent amount of your SPL) has to do with how clean your port is.
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