Same system other than the amp.
(Speakers are Sonus Faber Seraphino).
I have had a Pass Labs X-250.8 (class AB) for the last year or so.
A couple of moths ago I could try at home a pair of Pass labs XA-60.8 monoblocks. Same manufacturer and not very different price.
I thought that if the X250.8 delivers it’s first 16 watts in class A and it never leaves class A, then I was good to go, Pass class A all the time.
BUT BIAS (current, ampers) of class A in the XA-60.8 are 3 times higher than in X-250.8
Does it matter? Well, I sold my 250 and I couldn’t be happier now with the XA-60.8s
Better timbre, overtones, layers, soundstage …
Same brand, not very different price and for me it makes a hell of a difference.
I’m not trying to argue, just contribute to the community with my recent experience.