Yup, my transformer has buzzed since day 1. Of course, it's most noticeable when in standby mode. I assume noisy AC will increase this sound. Try fiddling with a dimmer switch nearby (if youhave one). You will notice a change in the tone and amplitude of the humm.
The humm has never been a sonic issue when listening to my 23.
B
The humm has never been a sonic issue when listening to my 23.
B