I purchased the K-300ki from @yyzsantabarbara and could not be more thrilled with it. IIRC, the K-300i was the first product that used the iBias circuit although they may not have used that term in the original K-300i literature (or maybe even now). I heard that directly from Krell. They’ve got something special on their hands.
Like yyz, I suspect it’s the Class A sound I’m liking, but I have never heard a traditional class A amp, so it’s only a guess. But forever, I’ve read near universal praise for the SQ of Class A amplification (when well-designed of course) among audiophiles who appreciate solid state. Excessive heat and weight were the form-factor drawbacks. Krell iBias eliminates both, it seems. BTW, overheating issues are news to me. I never came across that and have not had that issue. I leave mine on full time.
Irrespective of why it sounds great, the K-300i is simply stellar in my opinion. I read reviews, spoke with dealers who carried the Krell and had also heard gear and/or were dealers of gear I knew well (so we could discuss how the Krell compared). I also spoke with owners (yyz) and read their posts here on AG. Do a search for K-300i in forums. Bottom line, I believe all the high praise for the K-300i is warranted.
I was planning to buy from a dealer who offers a return policy but decided instead to take a non-refundable plunge by buying used. It has panned out, to say the least.
Smooth as butter, yet punchy, detailed, holographic. It’s not bright at all, but not rolled off either. Nice sweet highs if it’s in the recording.
My only source is an Innuos Zenith streaming Qobuz. The Krell responds noticeably to cords. I tried 2 I had on hand. So you can optimize your SQ with cords to reach a sound you like with your Be tweeters.
If you’ve not done so yet and are interested, there are some good testimonials about the K-300i at the Krell website. FWIW, I concur with them.