"Oh-wo-is-me!" Just spent a small fortune (to me) on bass traps for my HT....where the new 11A's are. Since there's not much of a first reflection from the 11As, I placed cyclical diffusers at second reflections, flanked with some abfusers. Same abfusers in the rear of the room. And although ML don't project much upward, I still have a little absorption in the ceiling for Atmos reflections. Anything I tried behind the 11A's sucked the life out of them so its bare sheetrock wall. Granted I'm still in the break-in stage of the 11A's but I'm able to distinguish enough to determine acoustical placements. So far the room sounds pretty balanced, live, not dead, and good staging. So I'm thinking, this is lovely, can it really get any better? Ok so here's where the "Oh-wo-is-me" comes in. Every freakin thing I've read says "YOU MUST HAVE BASS TRAPS TO GET CONSISTENT BASS IN YOUR ROOM!" So yesterday, in comes my beautiful GIK 4" thick Impression bass traps but something told me, before going into this major installation operation, stage them first and see how it sounds. I was already overjoyed with the bass from the 11A's but with the traps in, they seemed to make the bass stronger (not better), a little deeper, more surrounding but artificial, not precise or believable. But most disappointing, the traps TOTALLY sucked the mids and highs life out of the room. Properly toed in, its nearly impossible to kill the almost perfect phantom center MLs are known for. The traps aggressively attacked that staging, stealing the openess, and liveliness of the room...almost feeling anechoic. So one by one I began removing (8 total - 2 stacked for each 4 corners). With only one trap in each corner, it got a little better. Tried traps just in the front, then just in the back...YUCK! Granted I still haven't done any calibrations but ARC isn't going to correct for mids/highs decay. Now in no way am I suggesting not to use bass traps but "in my room", for "my ears", they didn't work. So I have $800 worth of bass traps I have no use for and can't return them because they were custom. Next move - once break-in is complete, I'll run ARC and rely on it, my dual subs, and a little tweaking to dial in the bass to sweetness. I guess the moral of the story is, trust the science; to a degree. You ears are the ultimate judge.