ADCOM

I owned a GFA-555 for 30+ years.
I worked as good for all those years until I sold it a year ago.
Nelson Pass did a great job on those amps.
I have no experience with other Adcom equipment, but suspect it to be equally good.
Bob

I own a 545v2, also a Nelson Pass.. sounds pretty good.. especially for about $250.. I keep as a back up for when my main amp is being switched or fixed.. I never feel I'm missing that much when in use.. My main amps float n the $6000- $8000 range new

Gfp750 preamp and gfa565 mono power amp.