Separates vs Integrated

I had a KRELL Duo 175XD amp (loved it) and the CODA 07x preamp (hated it). I came from the CODA CsiB and the KRELL K-300i (the latest Duo XD model). I currently have the CODA #16 (love it).

Separates are better in every case I tried. I tried many combos. With that great KRELL amp you have my fav was the Benchmark LA4 preamp. The Holo Serene KTE would also be good if you want to stay closer to the 07x sound. However, the 07x and KRELL is not my favorite combo at all. The 07x is noisier than the 2 preamps I mentioned (by a lot) and warmth on top of warmth is too much heat for me.

Try the LA4 on a 30-day home trial or get one cheap on USAM.

I also have a great streamer in the Lumin X1 (sold it) and the Sonore OpticalRendu (kept it) when I had the KRELL Duo 175XD. I only do Fibre Optic streaming. The RJ45 streaming on the KRELL K-300i was very convenient but not as good as Fibre.

You’ve got a nice pre and amp so begs the question what specific improvements are you looking for?  Personally, and especially if you like the sound you have now, I’d look to upgrade your streamer first — something like an Aurender N200 or Innuos Pulse or Pulsar would almost certainly provide significant improvements.  

it's probably a question for an engineer. I don't think integrated can beat separates. when the separates match spot on. I.e. you did the engineer's work - "outside the box" - and figure it out. I would think that high end companies selling separates and integrated have the answer. 

@yyzsantabarbara thaka for the info, reply, the Holo Serene is interesting.  I agree on the Krell Amp, I’ve been lucky enough to be able to try various amps and it’s been my favorite.  Noise and synergy are what have me asking the question.  I have found it’s hard to match a pre to the Krell.  I had a Krell Illusions ii Pre, no surprise it paired the best out of any pre I have tried, dead quite.  Sound wise, didn’t love it the way I should have.  
 

@soix my system sounds really good currently but the gains / synergy between the gear is where I think I could potentially improve.  It’s that synergy that has me wonder about a high end integrated vs what I have.  My next upgrade is likely a streamer if I stick with separates.  

@grislybutter I’m chasing synergy but I shouldn’t at the expense of quality of my set up.  I’ve had a Krell Pre with a DAC on my system, the gain match was perfect, was quiet.  Sound was very good but not great.  I found separate DAC’s improved sound and various Pre’s also sounded better.  But, matching this amp with a pre has been more of a challenge than I would have thought.  Seems to be really sensitive to the gain / voltage settings in the Pre.  
 

Thanks for all of your responses, appreciate it. 

About three years ago, I had to downsize my audio system because I had to move  from a very large room in the house to a smaller room in the house.  After extensive, exhaustive research and auditioning, I opted for the Hegel H590 integrated amp to drive my power hungry Revel Salon 2 speakers.  All I can tell you is this, the Hegel H590 has become my end-game amplification for the foreseeable future.  Happy listening.