For what it's worth, I owned an Adcom 555 decades ago and have a 4B3 now. You will hear and appreciate the difference, the "cubed" series being some of Bryston's most mellow amps -- softer sounding than my beloved 14BSST of years ago, but detailed and spacious for sure. I auditioned a non-class-A Pass amp before choosing the Bryston. I liked the Pass a lot, but the heat was unbearable in my room. The latest Brystons run quite cool and have great sound.
I didn't think the Pass was better than the Bryston or vice-versa. To my ears, the Bryston is more neutral, in a good way; the Pass, a little romantic, in a lovely way.
I didn't think the Pass was better than the Bryston or vice-versa. To my ears, the Bryston is more neutral, in a good way; the Pass, a little romantic, in a lovely way.