Hello to all, I am a newbie to this forum and HT. I have asked two questions before this one and if it wasn't for you guys I would still be behind my A/V cabinet. Thanx again! I have a Harman Kardon AVR 520 and a bose AM 15.Iv'e already been made aware of my bad choice in speakers and we are looking to dump the bose ASAP. My question is that when I turn the HK 520 on I get a Loud buzz from the bose system. I have the acoustimas turned up all the way. I have optical connection from the HK DVD 50 to the HK 520. Is there any quick fix or explanation to the buzz. It buzzes for only one sec. then everything seems O.K. Thanx to all in advance.