Hello. I am new to ML and to this forum. I could not find this exact issue discussed in another thread. I have a new-to-me pair of Vantage driven by a Marantz 7012. As I had done with my former speakers I bi-amped them, which sound great, but when the receiver is turned off there is a 60 cycle hum that didn't happen when they were single amped. I know that the ML owners manual advises not bi-amping but other than the hum it seems to work very well. Is there something that I am doing wrong or is there a fix to this? Thanks!