Some old favorite recordings that always sounded fine on my old system really do sound terrible on my much improved new system. I’ve mentioned it before, but when the deficits in the recordings of the original vinyl pressings of Layla and Let It Bleed were revealed on my new system they both were almost unlistenable, Layla being the worst of the two. Other recordings were a revelation on the new system.
So agreeing with jumia, there is a lot of the sound you’re hearing that’s embedded in the quality of the recording you’re listening to. That’s both for better or worse, once the nature of the recording is more accurately revealed. Nothing you can do about it, other than looking for better source material. Replacing the two recordings mentioned above with remastered SACD’s helped some.
Thinking all your recordings will sound better on an expensive improved system is wishful thinking. The bulk of your recordings should sound better though. Some of those old 1950’s jazz recordings in particular have been pleasant surprises.