Monolith THX-265IW - THX Select Certified 2-Way in Wall Speaker, 1in Silk Dome Tweeter, for Home Theater, Easy Install

I have these in my HT setup in LRC positions. These have pretty good bass, and wonderful mid-range. Vocals, acoustic material all sound natural and pleasant. The natural sounding midrange is typical of silk dome tweeters. My AVR is a Yamaha Rx A2A. The one thing I find wanting with these speakers is the treble end. I ended up having to manually EQ the L-R-C speakers ( +2-3 db in the 6khz and above bands) to get acceptable highs. I am using the GEQ "per channel" equalization and NEO Music setting (listening for Tidal). The anemic highs are a problem with all processing options. Given my GEQ adjustments, I am almost happy with how these sound now, but bells, chimes, cymbals still sound a bit muffled, compared to other speakers I have, such as infinity, Micca, or Klipsch bookshelves. The product description is incorrectly mentioning 2 tweeters, this speaker only has a single 1". I have not done extensive wall cavity prep, just braced the drywall above an below the speakers to minimize any rattling / wall resonance. The wall cavities are filled with lose fiberglass insulation. This should be OK because, the thx certification of these was done without a sealed enclosure, so the were designed for in-wall install without a backing box. These go down to 40 HZ, but I have a crossover point set in the AVR at 80hz, Anything below that goes to the subwoofer only. Eliminating the frequencies under 80 hz cut down on in-wall resonance, although the bass is nicer when the speakers are set up without the AVR-s bass management. When mix-and-matching with other speakers, keep in mind that these are nominal 4 ohm speakers. I find that using 8 ohm surrounds and altitude (monoprice alpha-s in this case) makes it difficult to EQ the whole HT system because of the higher impedance of the other speakers. Even when boosting the other speakers' level via the AVR-s speaker management, the other speakers tend to sound weak compared to these. There is probably a sensitivity difference as well, which may further explain why. My recommendation is that at least the LRC and Surround LR should be all similar impedance, similar timbre, similar efficiency speakers. What I will end up doing, is replacing the LR with the 365iw-s and shifting the 265iw-s into the surround position. The 265 will remain as the Center speaker. Combine with a substantial rethink of their wall cavities, reinforcing/bracing and sealing their cavities. so I can run the LR with full spectrum sound.