How do the Monster bass traps deal with mid and high frequencies? The problem you may have is reflections in these ranges. The Monster bass trap is actually designed not to over absorb high frequencies but in your case reflecting HF so close to your ears may be a problem. The ASC bass traps I use actually have a mix of reflecting surfaces so you can tune the HF by rotating them.
Anyway why not try tacking a GIK acoustic panel behind your listening seat and see if that improves matters. I also like having HFTs on the rear wall behind my listening seat, plus a set of ART modules as well, these all help focus the rear wall, kind of putting back the life that my ASC diffusers take out but in a controlled manner
Anyway why not try tacking a GIK acoustic panel behind your listening seat and see if that improves matters. I also like having HFTs on the rear wall behind my listening seat, plus a set of ART modules as well, these all help focus the rear wall, kind of putting back the life that my ASC diffusers take out but in a controlled manner

