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Firehawk AC hum in stereo mode

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Hi Folks ,'

My current rig is as follows

Guitar  > Xotic RC booster > Firehawk in . 


My current backline amps are : Peavey classic 30 x 2 , Line 6 Spider valve MK1 .


No problems whatsoever with any one of the three amps ( Poweramp in on the Spider ) , instrument in on the Classic 30's  ; until I try to run  any two of the amps in Stereo . Then  i get a loud LF 'AC' hum . I haver tried separate AC supplies for all three devices , but no dice . Anyone have any ideas ? Thanks in advance ! 

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