Im not able to compare the 640v2 directly with any other CA amp as I owned one before I owned a 540v2. I can compare a 540v2 with a Marantz pm5005 however. The CA is a better amp than the Marantz in both build quality and sound quality.What amp. Do you own now and how do you compare it to the 640a v2 or other older Cambridge, I still really like the sound of them and can be picked up for a song
I did run a 640v2 with Monitor Audio Gold reference 10 speakers. Surprisingly the amp was capable, plenty of detail but a little bright with the c cam drivers.
Old CA amps punch well above their weight and price point.