Re: [OT] Noise interference problem

["Nic Roozeboom" <Nic_Roozeboom@msn.com>]

>>If you're not overloading it by signal,

>well, that's the odd thing--at least to me. If I plug straight into
>my amps, there's no problem. When I run through all my gear--problem.

I may not be the best qualified for remote troubleshooting (seen some very methodical guidance offered on this list many times), but these are my thoughts:

 

If the signal chain of the additiona gear you mention doesn't affect the gain / average power of the signal (adjust if so), then eliminate each piece of gear individually (take 1 out, put back in chain, take 2 out etc) and check for improvement.

 

If level "shouldn't" be a problem (I.e. if amp headroom appears to be sufficient) and the amp is overloading thermally, I tend to suspect inaudible (high or low frequency) in your signal. It could be e.g. that one of your digital (i.e. sampling) effects units is contributing significant out-of-band power if it lacks sufficient post-filtering. If that is the case, putting it upstream from anything that does have good HF roll-off should improve the problem.

 

Nic

----- Original Message -----

From: Jeff Shirkey

To: Loopers-Delight@loopers-delight.com

Sent: Saturday, August 02, 2003 12:51 PM

Subject: Re: [OT] Noise interference problem

>
>Sounds a bit like your amps might be going into thermal shutdown.

Needless to say, this doesn't sound good! lol

>If you're not overloading it by signal,

well, that's the odd thing--at least to me. If I plug straight into
my amps, there's no problem. When I run through all my gear--problem.

>  other potential sources of overload are hum, a DC offset problem
>(if DC coupled), or (inaudible) excessive RF interference coupling
>into the amp. Neither of these are necessarily solved by a supply
>filter such as the Furman.

Now I'm in over my head for sure, which was why I called Furman in
the first place. I may take your comments and run them by the guy I
talked to, just to see what he says. He was pretty thorough in his
explanation to me previously, but I didn't hit him with the scenarios
you are proposing either.

>  It would take some investigation if it's not simply a matter of
>trimming down your average power level.

Call an electrician in other words?

Thanks for your help,

Jeff