Bass trap made out of existing structures
SO my new home builders love to go over kill with big and box structures around things that reaaaally don't warrant it.
Two structures in my basement are; an almost entirely empty vertical 'duct' against the wall, and a pillar. Both are drywall structures thats about 90% air inside.
I am rolling with it though and actually mirroring both as they sperate the room nicely and the speakers need a place to mount. However... I feel like its a wasted opportunity to not leverage the obscene size of them as bass traps.
The wall box is 19 inches deep and 46 inches wide.
The pillar is 17 x 17.
1) if I cut a large hole into the drywall, stuffed it with some good old rockwool, and placed fabric over it, or perforated high range diffuser plate even... would I have turned it into a pretty huge bass trap?
If yes, should I block off the back where the structure insulation is.
Should I open up the sides in some manner so that sound can enter at more extreme angles and how would that effect the performance?
2)Is the pillar worth doing the same sore of thing to. An absorber/diffuser right behind the rears is nice obviously, but if turned the pillar into a cavity, or even a pass through of rockwool, would I get much benefit given that it is so far from the wall?