Even the hi end processors are limited in their SQ.
i use a low end tube preamp and like its influence on hq sound.
Yes, they are limited in their SQ. So limited even a low end tube preamp is an improvement.
What I been saying for years. A cheap stereo anything is an improvement on even the most high end multi-channel processor. The obvious solution to improved HT sound: ditch the multi-channel processor.
Simple. Logical. Affordable- and actually works.