Upgrading form Pass integrated amplifier to a better one


Hello,

Currently I have a PASS INT-250 integrated amplifier . The Pass INT-250 is a very good integrated (in my system it was overall better than Plinius Hiato, Gamut D150se, Mark Levinson 535, Vitus RI-100,  Accuphase E-470 and some others) but I can't get rid of the feeling that I miss some explosiveness (drum kicks for example) and micro details.

I know that its not the speakers. The new Sonus faber tradition I have are much more open, dynamic and airy than previous Guarneri Evos, Elipasas SE and Amati Anniversarious I used to own. And before buying them I auditioned the Serafinos with Audio Research separates and it was the amazing combo. But I really prefer not to go the separates road ( ICs, power cords and space contribute to financial constrains also) and even so I like the combo of Pass and Serafinos overall but from time to time looking for some better integrated on the market.

Currently I presented with a good opportunity to buy latest Gryphon Diablo 300 integrated or latest just released Accuphase E-650.  No possiblilty to demo them, so I am asking here on the forum if anybody can comment if Gryphon Diablo 300 or Accuphase E-650 will be better integrated than Pass INT250 overall and especially in terms of dynamics, micro details and harmonics.

Any advise and opinion would be very appreciated.

My system: Esoteric K-05x, Pass INT-250, Sonus Faber Serafinos, all cabling are the Shunyata Sigmas.

Room is 12" wide by 17" long. Listen mostly acoustic jazz and chamber classical on low to moderate levels.


Thank you.


denon1
I have a set of SF Serafino powered by the Rowland C500 Integrated.  I've rolled a few amps passed these (ARC, Moon, Primare, TACT, Naim) and found they are a bit fussy.  I found no combination unworkable but was surprised at the differences.  In my setting the C500 is perfect, keeping the high end smooth and the bass full but tight.  I could have lived with the Primare I30 as well, surprising good balance and detail from a smallish package. 
@denon1

If you are still looking at upgrading your sources i would highly recommend Totaldac as some of the best out there.I have auditioned the Esoteric N-01 and the Totaldac Seven same price point and my choice went to the Totaldac Seven no hesitation.Totaldac much more analogue sounding and natural.You should also check out Melco against the Aurender N10.All the best.
http://www.totaldac.com/D1-seven-en.htm