fi q flush mounting help/bracing

[69420potsmoker 10+ year member]

Does a sealed box need internal bracing anywhere?

its a 12 q with 1200 rms

Also if I want to flush mount it can I just glue a sheet of wood to the top panel and it will be fine?

I would like to build the box before I have the sub so does anyone know the height the flush mount needs to be and the diameter of the sub hole?

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[69420potsmoker 10+ year member]

ok i found the inner diameter cut size on the site(thought it was something else earlier) so I just need the other flush mount measurement.