Distortion from Audio Rack ??

Keeping the Cabinet if it is a appreciated furniture item is to be encouraged.

Improving the Cabinets Interface within the Room, as a support for audio devices is quite straight forward.

The Cabinet can be sat on a low profile Sub Plinth with an Isolator Footer between floor and Sub Plinth and Sub Plinth and underside of Cabinet. The Sub Plinth can have a Cherry Edging Bead to keep the match in keeping with the furniture.

A Sub Plinth and Sub Sub Plinth will have a improved impact on the managing amplitude of ambient energies within the local structures being transferred into the Cabinet.

The next consideration is crating a support structure for the audio equipment that has rigidity, energies produced within a room can impact on a support structure, with the outcome being movement. Movement is a new energy, and this energies amplitude will be able to transfer into audio devices. Reduction of this energy type can be achieved by anchoring the Cabinet to the Wall with fastening. A decoupling device as used on the base can also be used as a separator between the Cabinet and the Wall, again to    d rIf a   

The issue with components that are situated too close to one another is EMI. I always found my system to sound much better with the amp out of the rack even if it was just sitting on the floor at least a foot away from the nearest component. Keep the power conditioner at a good distance from everything else as well. 

I really appreciate the input.

I'm not going to go as far as refurnishing our family room to accommodate the audio system.  I do think my best option is to individually dampen each component on my rack.  I'm looking at the IsoAcoustics Orea line.  I've also been in touch with a local audio store that does custom installations. I may have them do a home consult and outfit the rear of my audio rack with some cable organizers to lessen whatever distortion may be emanating from my previous placement of cables. 

My Eversolo A10 also has a room correction feature.  Once I handle the other fine tuning, I'll purchase an appropriate microphone and utilize the room correction programming and then see what additional improvements I find. 

If my marriage holds together through this (she thinks I'm crazy) I may get to a place where I'm satisfied that I've attained most of what is achievable given the limits of my current audio and room configuration.     

They all think we are crazy. 

To the OP:  I am of the school of thought that the best equipment stand between the L/R main speakers is no equipment stand, as it interferes with soundstage, imaging, and early reflections symmetry, usually.   If the speakers are pulled 7-8' out into the room and the rack is pressed right against the front wall, then that helps reduce its sonic impact on sound quality.  Instead of a large wall unit or rack, have you considered placing components on the floor atop amp stands or wooden butcher blocks with anti-resonant footers beneath the stands/blocks?  It should improve things I'd hope.