Krell FPB 400CX vs PASS LABS X-350.5

I agree with Tvad and Pdreher. Based on my experience with earlier Pass class-A vs AB designs, including older Threshold models, if the XA-60.5 is remotely close in price to the X-350.5 go for the XA. It will sound enormously powerful on the Nines and will have subtlety and nuance the AB amp lacks.

Happy listening,
John DeVore