Hello All
as @r27y8u92 just posted, an important topic to learn
I, myself was guilty that Gear solves all the problems. well, that is not completely true. encountered this same boom issue with my REL subs. Using UMIK and REW, i discovered my boom issue causing room vibrations and some rattling on the other rooms windowpanes. after months of trying placement options and padding, i ended up with ATS room acoustics and targeting the boom, I used it to isolate the subs against the wall. and REW showed visually the impact of what the ATS panel did in delete the Boom (it is a spike on the frequency graph)
after all that, music sounded a lot different, its more surreal and BALANCE as how music should be. no more spikes and emphasis on certain frequencies.
Gear did not fix it; it was isolation and treatment.