Here's the link where soulrider4ever talks about the A1 amps:
"So James has been great to allow me to demo the A1 amplifier. Unfortunately, these OpusII-3's are CURRENT hogs, and the entire time of demo'ing the A1 amp it sounded strained, which made the speakers sound harsh and fatiguing. At low listening volumes I could hear some subtle micro details that the XPA-1's missed, so yes these amps are incredibly detailed in bi-amp mode. So if you have speakers that work well with tubes, then please give this amp a demo, you will be impressed - esp. with a pair in bi-amp mode.
It's well documented that Wharfedale + tube amps are a no no due to lack of current. The A1 are 10amps peak output current for those who are wondering. So, I will be sending the A1's back to James, but be sure to reach out to him if you are interested in getting your hands on a pair for demo."
Sound like they are pretty nice, but were underpowering his big speakers.