I’m not sure I understand the question. I have always kept my HT separate from my two channel system. My two channel system always takes priority over the Home theater. The impact of a small change (improvement) is always much greater in my two channel than in HT. After all most of your attention is on the screen… so while the some sound is really important in making the whole thing believable, nuances are not.
I would always spend $3K on my two channel system before fiddling with my HT… unless grossly deficient in some way.
AND… DSP is not getting anywhere near my two channel system dag nabit… you young whipper snappers.
Well depending on what you mean by DSP… I stream with a high end streamer and DAC.