churdoynz71 Posted October 18, 2019 Share Posted October 18, 2019 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 ! Quote Link to comment Share on other sites More sharing options...
zappone Posted December 6, 2019 Share Posted December 6, 2019 Try to activate "LIFT" near LEFT/MONO XLR out. Quote Link to comment Share on other sites More sharing options...
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