Recommended integrated amplifier for upgrade

@jasonbourne52 i am using Topping D90 AKM 4499 DAC (warmer than ESS 2nd edition D90) from Auralic Aries Mini to Krell via balanced XLR .

I believe Topping PA5 is more suitable for desktop monitor speaker ,  I prefer musical and warm sound.

Wow, many thanks for all your sharing and thoughts. Understand and heard Audio Research are good match with Sonus Faber, my current Krell was also a good match , that’s 15 years ago and not the new Krell .  
 

I prefer slight warm, musical with wide soundstage, but not bassy.  
 

Thus, I would most likely look for Accuphase E280 like @robelvick suggested or Luxman as @ghdprentice @erik_squires mentioned.  

If Mcintosh sound too solid state “detail”  as mentioned like Krell, i would remove from my wishlist. Detail is good but not for long listening time.
 

I prefer a more relaxing music soundstage unlike 10 years ago as aging lol
 

Hope will get a demo unit for audition with my 88dB 4ohm SF speaker

Appreciate your feedback

Too clean, too analytical, it sounds dry thus boring and fatigue over time. Thus, prefer slight warm, analogue and musical soundstage.  I was thinking about tube hybrid amplifier but it could be too warm and need maintenance on tube or tube rolling … 

Appreciate all your feedback .

Initially I was interested on ASR report, as I read more , I feel their review are biased. I got my first edition of Topping D90 replacing my decade old Cambridge audio DAC Magic after ASR review.

Thanks @snapoli2 for your Luxman recommendation, Luxman 590axii and 509x is above my budget of $6,000.

@wsrrsw Ya, I have subscribed to ROON, small and dedicated audition room setup (12’ x 12’) .