Hello Experts, I got a new PRS-D4100 installed on 13th Feb, 2012. I am please with the quality of sound. However, every time I switch on the Head Unit, the Amp also gets swtiched on with a 'CLICK' sound and similar sound when I turn it off. Is this a usual behavior or something wrong with the connections? Please advise your observations. My e-mail ID is makisbak2010@gmail.com