Rogue Sphinx v Nakamichi PA 5 MMKII and a preamp

I got the Rogue  Great anp but does not seem to be a good match. Very dark with a rolled off top end.  Tubes big surprise.  Switched back to the Yamaha  M4 and CX 800U and it was like a blanket had been taken off the speakers.  Larger stage more dynamic  yes brighter but way more alive. I kno0w I can change out tubes but not looking to go down that never ending road  The age of a unit does not matter to me.  I find most older gear sounds more musical and with more body verses much of the hyper detailed thin sounding outright weird newer affordable gear.  i hear this from others all the time.

Umm what  would I replace RS 2.5s with?  Have you ever heard a pair? I have had   Vandersteen, Von Schweikert PSB, Mirage, ADS Energy,Polk Canton and so on.  They all have their strengths but  The 2.5 is better in almost every way.  The Rogue is not doing anything wrong it just sounds a little  veiled and not very vibrant compared to the other gear.

Well there we have it.
I guess you have had them all  in your home and compared them all side by side so to speak ?  I know I have .   As a matter fact had Vandersteen 2Ce and 2CE sig 3 times. Great speaker but not for all of us.
Each to their own.