I thought I had "graduated" from separates with my Plinius 9100 (in one setup) and a 8200 MKII (in another). Also tried Audio Analogue Puccini 70...all with the Merlins.
But I still couldn't quite get the sound promised by Merlin TSM-MMe's. Merlins are so revealing and transparent...and I wasn't getting that. So back to separates. First my modded BC 21.1 (I always liked that pre), my Audible Illusions L2, and then the Dodd (after reading Mariusz rave about it). With amps, it was a McCormack DNA 125, Rotel 1062, a B&K, and then finally the Pass Aleph J.
The Dodd, Aleph J, and the Merlins seemed to jump out with all the soundstage, musicality, warmth, etc. I was looking for. So I have my (as I said before) my "poor-man's-refernece" system.
Can one achieve this with an integrated amp? Maybe with a Pass, Edge or Accuphase integrated for $8-12,000. But I'm not sure.
My final "tweak"...I have an Edge G6 amp which I sent to Tom for his mods and I will them compare that amp with the Pass Aleph J. Looking forward to that.
My final remark...I assumed one got synergy with int. amps...but I did not find that. Even with fairly good gear (Plinius).