Best integrated/power amplifier under $6000

The latest Krell integrated is probably the best balanced sounding integrated 
under $10 k out there, their recently discontinued Vanguard is similar is many ways ,the Vangaurd has 50 more wpc, the same class A amplifier section 
the sliding Ibias that goes up to around 80wpc into pure class A then transitions 
in part to class AB I was told ,the new  integrated over 90 wpc into pure class A 
and has a preamp out ,the Vanguard does not .i run subs ,Crutchfield makes a great little adapter board where you can plug your rca into sub and just run 4 
wires to adapter, then spade or bananas to speaker terminals then run your subs 
for $50 and no down side. The Vangard was $6k ,$7200 with the digital board and hdmi,inputs and out ,plus spdif and optical , I picked one up loaded 
2 years old like new for $2k delivered ,it sounds excellent ,and I have had many excellent $$ amps as good or better then any $10 k amp preampIn my system.

I haven’t heard the Krell, but it got soundly beaten in a head to head shootout against a Hegel 390 and I think a Levinson in a recent review. The Hegel won. This despite the Krell and Levinson costing thousands more.
I don’t have an opinion on it.
I will say the Krell inbuilt fans would give me pause, perhaps. Annoying enough when my laptop fan kicks in ....

sorry I don’t remember where I read the shootout article. What I remember tho was the reviewer saying Hegel wins on sound quality regardless of price. That it costs much less was an added bonus. Take such reviews with as many grains of salt as you prefer I suppose. As I recall it didn’t go into a ton of depth with the comparisons.

edit: found it, here it is - HiFiCritic mag
https://www.hegel.com/images/reviews/H390hificriticuk.pdf

It looks pretty ugly, but in terms of sound, WOW is all I can say.
Belles Aria integrated amplifier is a piece of jewel.
Also the Phono stage built in is sublime.
Try one in your setup, I'm confident you will not regret.