my speakers hum

Because you are trying to play music to songs they don't know the words to.... Badum dum! :)

Sorry.

Can you describe the speakers that do hum? Are they particularly efficient? or powered?

Usually it's your cable TV or a connection to a PC.  Try disconnecting it, if any, and see if the problem continues. If so, I have a solution for you. :)

Best,

Erik

@eniac26

Wouldn't make a difference at the speaker end. :)

Best,

Erik

OP:

Get a digital V meter, something that reads down to 1V or less. Should be around $20.

Connect it to your speakers while you hear the humming. Measure the AC V.

Change speakers. Repeat.

I think you’ll find that the AC V is the same. If so, this means you are just hearing the
difference in speaker efficiency.

Here’s a good meter with a 400mV range that would be perfect.

http://amzn.to/2bISae5

By the way, this works because almost all meters are sensitive to 120Hz or lower, which is usually where power supply and ground loop hum lives.

Best,


Erik

@eniac26

I think there may be a misunderstanding. If you are telling me you have a passive speaker, then there’s absolutely no way that swapping the speaker terminals would create or negate hum.

If I misread what I was responding to, I’m sorry.

If you have a passive speaker, and swapping the speaker terminals and it causes any hum to come or go, you have got a very very odd speaker with a metal connection to ground which should never have occurred.

This may not be true if your speaker itself has a connection to the wall AC, in that case all sorts of such interactions may occur if not properly paid attention to.  This could be from an active speaker, an electrostat or the Focal's with the EM voice coils and outboard power supply.  Now hum can become very rare, but not impossible.

Best,


Erik