Remarkably better sound possible with just 1 system component change?

I could have posted this discussion to a few other categories but chose this one because discussions related to 2 of the 4 components in question belong here.

So it's been ~2.5 yrs since I purchased my current system. I did a lot of research at the time here on audiogon, but no auditioning, and put together a system that sounds very, very good to me.

While I have no complaints, the itch to upgrade has surfaced recently.

I am curious as to whether you guys think it will be possible for me to replace just 1 of my primary 4 components and obtain significantly better sound as a result. The more discernible and obvious the sound improvement, the better obviously. I am not looking for a marginal upgrade - I want dramatically better sound. And I am not looking to replace more than 1 component at this time. I am hoping to get a few ideas/candidates and then may decide to audition some of the recommendations before making a decision. Hopefully some of the upgrade paths are such no-brainers that I may even be able to take a leap of faith without auditioning. Note also that acoustic room treatments are not viable in my current listening location.
My current 4 part system:

1. Lumin D2 - 100% of my listening is streaming via Tidal
2. Mcintosh C2600 preamp
3. Mcintosh MC452 amp
4. Focal Kanta 2 speakers

Cables are Cardas Golden presence RCAs from the Lumin to C2600, Cardas Clear Cygnus XLRs from the C2600 to the MC452, and Kimber 8TC speaker cables to the Kantas.

Soundstaging, dynamics, imaging and overall clarity are all great. I have to say I love the Be tweeters. And the bass is punchy, tight, fast and certainly sufficient for my needs. Vocals and overall sound are warm, liquid smooth and analog-like, just the way I like it. (Forgive me if I've botched some of the characterizations - I'm no expert at this). The only thing I can think of that could use some improvement is the sound quality at lower volume levels, although that is not terribly important to me since most of my listening is in the 90+ Db range. Would be nice, though.

So while I do love the overall sound, surely dramatically better sound can be obtained via a 1 component swap? Budget is ~10k. Or will I need to spend more, or upgrade more than 1 component to achieve the desired result?

Thanks in advance for your time and thoughts.

+ mahgister

I use the term "snake oil" very carefully.. It may work VERY well in one place by doing something completely unintended, BUT resulting in a great change somewhere else..

Cable risers

One is a vibration issue, one is a cleaning issue, ones is a routing (noise) issue. BUT all are a result of adding one single part and applying it a particular way. They work well for more than one thing.. I can't hear a sonic difference, UNLESS I ADD noise through the cable.. Again routing, and vibration, If I'm really volume UP..

Audition - the magic word.

Cone speakers are one sound. Electrostatics are another. Magnepans another. Horns another. Go to a high end store and choose what sounds best to you. My personal vote is ESL's, but YMMV.

Those who say that room treatment is important, are correct. But optimizing your speakers could make a big difference too. Most important thing - enjoy the journey!
I don't have firsthand experience with this (yet), but I'd bet it would make an enormous difference in sound quality if you have room issues and can't (or don't want to) do room treatment:
If you replace the cables with OCC single Crystal wire that would be a big improvement over OFC fractured copper that you're using now.