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Uncontrollable Boom!, a bad gig.

I assumed it was but I actually did not ask anyone. The feedback that I got was that the bass volume was too low (probably from me cutting the 60 & 200 hz EQ points)

Well the 60 Hz will cause boom, however, this room could have a resonant frequency and when you touch it, it will woof. In my Church, it’s at 250hz. It’s so bad we had to use some sound canceling techniques to combat it, as well as eliminating all amplifiers.
 
It looks like an ersatz Gramma is just about within my skills, being not much different to some recording baffles I built in general shape. I have a lot of left over foam.

Actually, my wife has much better attention to detail for making such things look good, so I might ask her to have a go. That would use up the left over carpet earmarked for a, cat scratching post, but I am sure I can find some grey rat fur which would be a better match for bass cabs.
 
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The best tool in the box, +1 for the HPF
A parametric EQ is better for boom. Set it for medium to narrow bandwidth, maximum cut, sweep the frequency until the boom disappears. Then widen the bandwidth and lessen the cut as much as possible before the boom returns for minimum impact on the surrounding frequencies.