@jl35 I haven’t had the opportunity of trying out Pass amps in my set up. Their reputation though is stellar. Nelson is a legendary designer that uses high quality parts with top notch engineering. If you like their sound signature, hard to go wrong with Pass.
Parasound, I’ve had the A21 in my set up. The A21 + is a great value, punches above its weight class for sure, not really in the same league as Pass, Krell or Coda which was referenced in the thread.
I had a Coda CSiB integrated that I was able to compare to both the Krell 300i integrated and the Krell 300XD Duo amp. The Coda was fantastic, uses the 8’s amp section. The Krell XD gear has a magic, liquidity, sweetness to the sound while maintaining the drive, control over the speaker that made Krell legendary. Important to clarify it’s their latest XD gear. That said, their co-founder, Dan’s ex wife recently passed away, Krell’s future is a little cloudy.
I recently brought a Coda 07x Pre into my system, had me thinking about replacing my Krell amp with either the 8 or 16. Reached out to Coda to see which amp would be comparable to the 300XD and they said the 16 was the amp to look at. My thought process was as good as the Krell sounds would the Coda Pre sound even better with a Coda amp.
For my system, the Krell is special, to my ears bested Coda and Parasound. Build quality, parts used, Pass or Coda is likely a bit better though I’ve never compared them on that level. The Coda 16 is likely a game changer, beast that should deliver the best of SS with some of the attributes those who favor tubes. If it’s me, I’d take a long look at Coda, if I could find a good deal on a used Krell 300xd or the integrated 300i I wouldn’t to hesitate to jump on either. Good Luck!