I have a Pass XA.5. Its output doubles as impedance is halved. It replaced a Pass XA amp. Its output was constant. In my system, there is no comparison between the two. The XA.5 sounds much better. There is now much better control of the lower frequencies. Bass is more articulate, fuller and deeper. I'm sure results will be different for different amps and different speakers.
I wasn't aware that Nelson Pass thought his X series amp was perfect. That is a very interesting statement, er, question you pose.
I wasn't aware that Nelson Pass thought his X series amp was perfect. That is a very interesting statement, er, question you pose.