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Speaker hiss from sub

My REL subs are causing my speakers to have a hiss, which I can hear when the system is off, but the subs idling. It goes away if I run an extension cord into my power conditioner (PS Audio PowerPlant). The subs are connected directly to my amps. Any ideas on solutions without buying multiple conditioners? I tried a simple plug in Isotek wall wart that is supposed to remove noise—no dice. Also tried a better power cord no improvement. Tried moving the sub interconnect around no change. Only way this his goes away is with the power conditioner.

 

Any ideas on a solution?

w123ale
w123ale OP
101 posts
 

I haven’t, I’ve only run the Neutrik cables that came with the sub—I don’t have RCAs that will go far enough. I have wonder if running RCA from the pre would help but part of the advantage, theoretically, is to run directly from the amps.

I have emailed Music Direct to see if they have any ideas.

m-db's avatar
m-db
935 posts
 

R. Edmund Lord marketed a sub bass speaker to accommodate people using receivers lacking preamplifier outputs and / or small low frequency restricted speakers. Along with RCA inputs he included speaker / high level inputs as do many manufactures. 

Using the more widely used preamplifier outputs directly to the subs low level inputs bypasses any noise, frequency restrictions and distortion imposed by the speaker amplifier and its input and output stages. As with any sub you determine any audible advantage. 

Monoprice or Blue Jeans cable offer economical custom length RCA or XLR terminated interconnects. 

w123ale OP
101 posts
 

Solved for $2.89! On a suggestion from Music Direct I got two “cheater plugs” from the hardware store—hiss gone!

noromance's avatar
noromance
9,488 posts
 

Hiss or hum?

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