Help in new processor purchase

The AVM 60 is great and has pretty darn good room correction software — is that not working?  My first recommendation would be to add a second sub to improve/even out bass performance and enhance overall imaging/soundstage.  Just my $0.02 FWIW, and best of luck. 

My room is mid sized and kinda oddball shaped, think I need some significant room correction, especially to fix muddy bass.

I would treat the room before buying anything new, otherwise not much point.

I would recommend a room kit from sonitususa.com. As far as a new processor goes don’t pay for features you won’t use. Maybe an 11 channel atmos/auro 3D channel processor is a better fit than a 16 channel processor like the AVM 90 or 13 channel MX123. Maybe the Mac MX-100 or their new 7.2 channel receiver which can expand to 7.2.4:

Room treatment and EQ your subs, then switch to a 2-channel integrated. :) You don’t have to have room correction to EQ subs but they sure help.

Another alternative is the Anthem integrateds or 2 channel preamps with ARC

For room treatment, the GIK Acoustic Soffit Traps are really hard to beat in terms of lower octave performance. 2" panels can't perform well below ~ 100 Hz or so.