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I am using a Fishman Platinum Pro EQ between my guitar and T8S. This preamp is silent with my other mixer and PA, but when used with the T8s and L1, there is  low level white noise. The Platinum pro has a post EQ XLR output:

XLR D.I. Output: Level (post EQ): 0 dB relative to input Output Impedance: 600 Ohms

I am plugging in to channel 1 or channel 2 of the T8S. I believe I have gain and volume set correctly on the platinum pro. 

The Platinum Pro has an unbalanced 1/4 out that is quieter, but the noise is still there.

Any ideas what is causing this or how to solve it? 

Original Post

No noise plugging in directly. And I get no noise with another pre-amp. I was thinking the XLR output from the Fishman might be too much for the T8S input? Maybe the Fishman is going bad and the Bose system is more sensitive to that. But I don't hear it when I use a mackie mixer and pa speakers.

Hi Larry 4,

Larry 4 posted:

No noise plugging in directly. And I get no noise with another pre-amp.

Okay - so the source of the issue is the Fishman Platinum Pro EQ or some interaction with the Fishman and the T8S.

I was thinking the XLR output from the Fishman might be too much for the T8S input? 

You can try lowering the input trim level on the T8S channel. You'll probably have to turn up the channel volume to compensate.

Maybe the Fishman is going bad and the Bose system is more sensitive to that. But I don't hear it when I use a mackie mixer and pa speakers.

I've encountered this before; when other PA systems don't reproduce the noise being created in the signal chain.

Can you hear the noise through headphones connected to the T8S?

Looking at the Fishman Platinum Pro EQ web page leads me to ask.

  • Have you tried the ground lift switch?
  • Are you using an AC Power supply or batteries?


ST

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