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REL studio III hum/rumble

I am using a REL studio III with parasound monoblocks. I am using high level inputs. The speakon
left and right are connected to each monoblocks red terminal. The ground is connected to left
monoblocks black terminal. I am using the monoblocks bi-wire posts to connect the sub.

If the amp is in standby, and the sub is switched on I get a huge rumbling sound. This rumble
does not come if the amp is switched on. Another point to note is that the rumble does not occur if the coarse cross-over is at A setting. Also the rumble gradually builds up slowly to crescendo
once the sub is switched on.

Any comments and suggestions are welcome.
indirstr8s
audimiata
31 posts
 
Ground the sub to directly on one of the screws on the amp cover, not the speaker terminal. I had the exact problem and this solved it. Good luck!
gandme
212 posts
 
I have Parasound JC-1s with a Rel Storm III connected as you described with no problems. I would avoid any alternate connections without consulting with Parasound.
indirstr8s OP
10 posts
 
Gentlemen,

Thanks for the responses. I will look at trying out some of them this weekend and I will keep you posted.

Gandme: Are you using the JC-1's second biwire posts for the sub connection?
What is your crossover set to.
gandme
212 posts
 
Indirstr8s, Yes I am... my crossover is set at A-4 I would have to consult the manual, but I think it is around 26 hz.
I just added a second Storm III...gives a fuller more balanced presentation.
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