mtnman82 Posted July 24 Share Posted July 24 Using the same power conditioner and speaker (QSC K12.2) as my rack unit. Rack unit is clean as can be. Stomp XL hums like a mo fo when USB is plugged into computer. Should I exchange units? Quote Link to comment Share on other sites More sharing options...
Schmalle Posted July 24 Share Posted July 24 It's a ground loop issue. What you're hearing is the (alternating) voltage between the computer's USB ground and the QSC's ground. Connect the computer's USB ground to mains ground. Alternatively a line isolator like the Behringer HD 400 / Pyle PHD 300 or something like that between HX and QSC does the job. A TRS cable with cut sleeve / ground lift should also work. Quote Link to comment Share on other sites More sharing options...
rd2rk Posted July 24 Share Posted July 24 You can also leave the USB disconnected unless you need it. Quote Link to comment Share on other sites More sharing options...
mtnman82 Posted July 28 Author Share Posted July 28 USB plugged into a laptop, but laptop also connected to a KVM monitor so that's the loop. Thanks guys! Quote Link to comment Share on other sites More sharing options...
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