Initially received my Burson Timekeeper monoblocks in January from addicted to audio, but one had a volume issue, so had to be returned to Burson via addicted to audio. Upon return all working now, I am using currently using low output RCA (copland as a pre doesnt have Balanced XLR) for pure class A into the Cornwall’s. The resolution and character of the sound is amazing, and has taken by Cornwalls to another level. I cant wait to also purchase a Burson Soloist XT GR in the near future along with some good headphones for late night listening. One reason I went for this Burson setup (apart from sound quality) is to allow the combination of one system for both speaker and headphone listening sessions “simplicity”, so that I have no more cable unplugging and swapping when moving from speaker to headphones with my turntable etc.