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REL Hum. Stumped

I’m getting a hum from both my REL subs. The strange thing is the subs don’t even need to be connected to the Luxman integrated to hum. All I have to do to get them to hum is plug in the Speakon connector.  If I disconnect the Speakon at the sub the hum stops. 
 

Connecting the high level wires at the amp doesn’t stop the hum;

nor does connecting the black wire to the amps grounding lug.

nor does running an RCA from an input on amp to the unused LFE input on sub

nor does using HumX to lift the ground

nor does changing outlets

nor does using the same outlet as the amp

nor does using a isolation transformer 

 

Btw the amp doesn’t even have to plugged in and I get the hum!

Im lost, any thoughts on what I should try next. 

last_lemming

Showing 1 response by cantorgale

cantorgale's avatar
cantorgale
115 posts
 

Had a similar issue with my S/812.  
 

For some reason on AC in my duplex outlet caused a hum.  The other did not.  
REL suggested running an RCA (assuming you are using high and not low connection?) to my integrated.  That helped as well.  
 

Now however I power the sub through my Transparent PowerIsolator (conditioner) and that has entirely solved the issue.  Frustrating.  Good luck!

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