I just hooked my turntable back up to my system. I had not used it with my current speakers. I have a set of 4425's. I was playing a record with some good bass and it sounded like I was getting a HUGE amount of hum. I thought maybe it was an electrical signal, but I am not sure. I have a set of 250ti's that I can switch to quickly and I did not get the hum off those. When I turned down the volume, the hum went away but it lagged me turning the knob by just a little bit. In between tracks it sounded like an electric razor running through the speakers.

As the record ended I walked to the turntable and it felt like that whole unit was vibrating.

Questions:

1) Would it be safe to assume I am not getting electrical interference but something vibration induced?

2) My room is a vaulted living room. Speakers are on a short wall, stereo is on a long wall. Should I have the stereo gear between the speakers? That short wall has a fireplace and after the JBL's are stuck on the ends there is no wall space.

thanks
Fred