I was so impressed with the amps (with the Sanders speakers and the Raidho's in another room) that I decided to get a pair and Merrill installed them a couple of days before the Audiophile Society meeting. They are connected to my original Quad 63 speakers and I am thrilled with the dynamic and not ever shrill sound. They replaced early ARC tubed amps, and I feared losing some of the tube magic, but no regrets at all. They are still a long way from broken in, but I'm happily listening at every opportunity. The cables are single-ended with Cardas connectors to the balanced inputs, and so far that is working wonderfully, though eventually I'll see about true balanced cables.