In general, when SQ isn’t great, it’s usually either something is wrong with the setup or the speakers themselves.
How loud and how far from speakers do you listen?
Most of the time, the electronics themselves aren’t the problem, unless the settings are optimized.
What is your source? BD player? Is it set to Bitstream or PCM?
What YPAO mode? Through or Manual or Flat or Natural?
What DSP mode? Straight or another mode?