The transformers in my D-200s hum, so I knew I have a DC component riding on my AC power. It did not bother me too much since it is not audible unless I'm close.
That changed last night when I put my ears close to the woofers of my Vantages, and heard a low level hum. I am fairly certain that hum was not there when I set up the Vantages last December. Since then neither the components nor the cabling in my system have changed. Anyway, this does bother me.
The hum occurs on both speakers whether the speaker cables are connected or not. I tried it with the Vantages plugged into the high current outlets of my Belkin PF60 power console, into the stronger filtered other outlets of the console, as well as straight into the wall. No change.
So I think I can conclude that the problem is not due to a ground loop, and that the power console is ineffective as a low frequency filter. OK, so that is no surprise.
Any ideas as to what could be the cause other than DC?
That changed last night when I put my ears close to the woofers of my Vantages, and heard a low level hum. I am fairly certain that hum was not there when I set up the Vantages last December. Since then neither the components nor the cabling in my system have changed. Anyway, this does bother me.
The hum occurs on both speakers whether the speaker cables are connected or not. I tried it with the Vantages plugged into the high current outlets of my Belkin PF60 power console, into the stronger filtered other outlets of the console, as well as straight into the wall. No change.
So I think I can conclude that the problem is not due to a ground loop, and that the power console is ineffective as a low frequency filter. OK, so that is no surprise.
Any ideas as to what could be the cause other than DC?