Paradigm monitor 7 s.7 with Burson Conductor 3R

I use it mainly as a preamplifier, I am generally satisfied. Just discomfort, when I close the device there is a loud noise in my speakers… is this normal?

I use it mainly as a preamplifier, I am generally satisfied. Just discomfort, when I close the device there is a loud noise in my speakers… is this normal?