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Hey guys

I've recently bought myself a Yamaha SPX 90 MK2 effects unit for getting a nice Chorus, Flanger and Phaser effect from but whenever it's plugged in to the effects loop of my Trace Elliot AH250 SMX pre amp, there's a really loud hissing noise even when the effects loop dial on the pre amp is turned off and when the output from the amp is turned off. As soon as you take the cables out of the Yamaha that go out to it from the Trace, the hissing stops.

Is this a grounding issue? If so, how do I stop it as there's no ground lift switch on the Yamaha and the ground lift switch on my Trace does nothing.

I really don't know what to do. I should note, everything is in a 20u rack mount set up with plastic gromits on the bolts and all is being powered by a Samson PB10 Pro power conditioner.

Cheers
Stevie

Edited by StevieD_FenderP2009
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