Speaker hum noise using LXII to power a speaker Cab from FM9

Power Amps LXII
1

I have a new FM9 Fractal unit running through the new LXII Fryette to power a 1x12 speaker cab.
Both output power knobs are at noon.
I have a hum coming through the cab ev

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IMG_25852856×2142 2.06 MB

en if Fractal unit power is 0.
Hum starts as Fryette power increases.
No Hum when Fryette power is off.
Ground button on FM9 doesn’t help.
High end cabling used.
Any ideas?
Thanks
Mark

2

Does this help? Ensure that the output level of the FM9 to the LXII is around line level and you have the volume on LXII set for your needs.

I can’t hear the hum, could be a ground loop too. How are your power cables connected?

Regards

Dan