Pass INT-25, split decision and maybe option?

To @audiojan if I may suggest, its the combination of your INT-25, SilverSmith Fidelium cables, paired with your PAP speakers all together, exactly what and why you are hearing what you are enjoying less now if you are more into a system with warmth and body to the sound. If you truly came from a tube system, with your PAP speakers, that prior matching likely worked well together for you in a more engaging way, correct?

We see you don’t believe your new cables have anything to do with it yet I happened to catch your post on the PSAuido forum with the same handle name about how much more airy and open your new cables are compared to Cardas Clear Beyond. I'm a Cardas owner and CBs are pretty open, airy, and detailed too. So, If this is the case, detailed + detailed + revealing = more revealing detail and less of a plush sound imo. Top end is likely much more tipped up now I'd guess.

Sharing fwiw, my main system is all tube. My secondary system is a tube preamp paired with a solid state amp of Pass lineage to help keep it a bit smoother etc.

Matching & Pairing:

If I were in your shoes, I’d be chatting with every owner to be found with your same PAP Trio15 Class speakers, and inquire more about which TYPE of amp and cables they choose to pair up with most and why.

Tube integrated:

Its easy to see why many here are recommending a tube integrated to you instead. Its not that your INT-25 is not a good choice, I just believe you are hearing more of everything now and the lushness of "tube" is not there any more. Note: I sold three pairs of the older Cardas Golden Cross cables to Pass owners with similar comments as yours and what you are experiencing right now - if it helps to know. 

I'd be looking for a tube integrated to demo next and compare, decide from there. 

There have been some great suggestions and the cables are definitely worth looking at.  I was also in a similar situation with my very expensive SS integrated which I really enjoyed but slowly realized I missed the tube sound.  Purchased a nice tube integrated and listening with a smile on my face!

Someone mentioned modwright and they're a brand I would definitely look at. Their KWH225i is a hybrid integrated. I have a pre of theirs and love it. Tthe Music Room is an authorized dealer and they often have an open box for a great deal. Might be a good match

Looks like the consensus is try a tube integrated. :-) I was hoping that the INT-25 would bridge the gap between solid state and tubes, but I think that was hoping for too much.

I'll look for a good tube integrated. I've had Audio Research in the past, so that's definitely an option

I definitely like the options having a Pass Preamp with the Sit-4…maybe it’s me but having separates is really nice…the Sit-4 really sounds nice with my horn speakers. I had a lot of tube gear in the past with lots of problems with the Primaluna gear. I always missed tubes so just yesterday I put in the Modwright Analog Bridge and it definitely changed the tone for the better, I slammed all the most harsh sounding fingers on a chalkboard electronic music through it and wow it took enough of that harshness away so I didn’t leave the room..one song I love is from Duran Duran Ordinary World it took that song and gave it a nice sweet tone..

I also have the XA-25, love the Sit-4 more…if you have to go all tubes play it safe and get the Cary Audio SLP-80…