I don’t need to see your system in order to give advice. No one really does.
I used to own a Marantz Reference SA-15S2 and thought very highly of it until I got a Technics SL-G700 SACD player which kind of ran rings around the Marantz in terms of air, dynamics, tone and that elusive see-through quality into a recording.
Ken Ishiwata had a preference for that Marantz house sound and it showed in all the product he had a hand in making. They all lean towards the warm side of neutral and most music played through them had that unoffensive sound that can be big and engaging but it kept things at a distance for me as I’m not a fan of a romanticized sound.
I believe the Marantz SA-30 came out after his death and as such, the designers of that unit (and basically all from then on) went for a different sound more in line with the likes of my Technics and others out there in that they’re more engaging, upfront and detailed with better slam and dynamics, going for a more neutral presentation without the romantic sheen of old. That’s my take on it.
All the best,
Nonoise