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Old 17th June 2015, 04:52 PM   #1
kuer is offline kuer  Canada
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Join Date: Jul 2014
Default Subwoofer humming with 2 receivers.

I have two receivers connected to ONE subwoofer, one reciever using sub-out to subwoofer, the other one using a pair of speaker-level wire to subwoofer.

When I turn on the subwoofer, I can hear constant humming sound from the subwoofer, no matter whether the receivers are on or off.

Tried different ways to eliminate the humming sound, eventually I found out if I connect two receivers with electric wire on the rear pannels, it's ok, no humming.

Can you tell me why, and this connection between both receivers is safe enough or not? or have any better way to take? Thanks.
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Old 17th June 2015, 05:19 PM   #2
rayma is offline rayma  United States
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Location: Upper midwest
Quote:
Originally Posted by kuer View Post
this connection between both receivers is safe enough or not?
or have any better way to take? Thanks.
There's a ground loop between the receivers. It could possibly help if a small 10 Ohm resistor
is added to each channel at the sub-out jacks' grounds on the one receiver, in series with the shield
on the cable going to the sub line in. You could use an adapter with the resistor inside, in series
with the shield, or cut the cable's insulation, cut the shield, and add the resistor in series there.

Last edited by rayma; 17th June 2015 at 05:23 PM.
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Old 18th June 2015, 11:01 PM   #3
kuer is offline kuer  Canada
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Quote:
Originally Posted by rayma View Post
There's a ground loop between the receivers. It could possibly help if a small 10 Ohm resistor
is added to each channel at the sub-out jacks' grounds on the one receiver, in series with the shield
on the cable going to the sub line in. You could use an adapter with the resistor inside, in series
with the shield, or cut the cable's insulation, cut the shield, and add the resistor in series there.
Thanks.
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Old 19th June 2015, 12:10 AM   #4
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Join Date: Nov 2007
Quote:
Originally Posted by kuer View Post
I have two receivers connected to ONE subwoofer, one reciever using sub-out to subwoofer, the other one using a pair of speaker-level wire to subwoofer.
Brave man. I wouldn't dare try that for fear of releasing the magic smoke?

Why would you want to do this, btw? I'm curious.
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