I phoned Blue Circle about the hum.
Once they knew that I using a Bryston 4B ST power amp ,they suggested to change position of the ground lift toggle switch at the back of the 4B ST.
Since I was only auditioning the BC3.1 and have sent it back,I will have to wait before I try that suggestion.
Once they knew that I using a Bryston 4B ST power amp ,they suggested to change position of the ground lift toggle switch at the back of the 4B ST.
Since I was only auditioning the BC3.1 and have sent it back,I will have to wait before I try that suggestion.