One more possible thing to consider -- I found that after treating first reflection points the system seemed to be more tolerant of less-good recordings.

If you're oriented on the long wall then the side FRPs are probably OK but think about floor/ceiling and definitely the back wall. Guessing the listening position is a couch or similar seating very close to the back wall -- if so then try holding a cushion behind your head to block reflections off the back wall from your ears (it's best if nobody is watching) while listening to a not-sounding-good recording and see if that helps.

Do the crossover first though.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8