| Hugest trap...
I used commercial bass traps in my 27 x 17 x 9h mix room. Took care of upper bass but not a fundamental problem I had at 32 and 64 Hz at the producer's desk. I designed & built one huge floor to ceiling corner trap (triangular 4 ft. wide floor to ceiling) to handle a problematic corner. Home depot materials. Packed very dense fiberglass (from roll, no paper) behind 1 x 3 framing. Chicken wire to hold it in. Made a nice framed cover with fabric to hide this huge and ugly trap. Looks great & nailed the problem,
pun intended. Bumps are gone (measured with band limited RTA) Cost of project $250 + sweat. Your best solution is self-education. I didn't have the cash to bring a pro in, so I became an "amateur pro". Best of luck!
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