I owned for quite a while the Pass Labs X350.5 amp. I had the opportunity to upgrade to the then newer model X350.8. I thought the .8 version was less lively and duller in dynamics so I kept my X350.5.
I eventually went on to tubes amps and couldn’t be happier.
I also owned for a time a Ayre five-Twenty preamp and I thought it was a very nice sounding preamp. Very little electronices inside of it though.
ozzy