rudomat Posted January 18, 2016 Share Posted January 18, 2016 hi! i´ve still found no solution for my ground loop issue i have with my orange dual terror amp...when i plug in the external amp switch cable, i get a terrible ground loop... has there been any solution for problems like this...? thanks! Quote Link to comment Share on other sites More sharing options...
efunkelist Posted January 18, 2016 Share Posted January 18, 2016 That's very peculiar since the channel switching should not have any part to do with the audio signal current... :S I'd suggest you'd open a ticket here: http://line6.com/support/tickets/ Quote Link to comment Share on other sites More sharing options...
wearethreads Posted January 19, 2016 Share Posted January 19, 2016 Do you also have this issue? http://line6.com/support/topic/16444-4cm-with-ext-amp-control-issues-with-exp-pedal-position/ Quote Link to comment Share on other sites More sharing options...
rudomat Posted January 19, 2016 Author Share Posted January 19, 2016 Do you also have this issue? http://line6.com/support/topic/16444-4cm-with-ext-amp-control-issues-with-exp-pedal-position/ yes... Quote Link to comment Share on other sites More sharing options...
audionutmike Posted January 19, 2016 Share Posted January 19, 2016 I've had the same problem with the ground loop. I haven't noticed the expression pedal issue, but will check tonight. Quote Link to comment Share on other sites More sharing options...
ultraknilch Posted January 21, 2016 Share Posted January 21, 2016 I'm also having the expression pedal issue... i really hope there is a software fix for this problem. Quote Link to comment Share on other sites More sharing options...
jaeger28 Posted January 21, 2016 Share Posted January 21, 2016 Iso box between helix and amp in, fixed. One should always have an isolator box for such issues. Switching and audio on common ground is normal for amps really. Quote Link to comment Share on other sites More sharing options...
wearethreads Posted January 21, 2016 Share Posted January 21, 2016 Iso box between helix and amp in, fixed. One should always have an isolator box for such issues. Switching and audio on common ground is normal for amps really. Did/do you have the expression pedal issue too? http://line6.com/sup...pedal-position/ Still the same after your iso box? Got a link to where I can get one of them at all? Quote Link to comment Share on other sites More sharing options...
jaeger28 Posted January 22, 2016 Share Posted January 22, 2016 Did/do you have the expression pedal issue too? http://line6.com/sup...pedal-position/ Still the same after your iso box? Got a link to where I can get one of them at all? No idea about this issue as I don't have it (my amps switch via midi) Isolation boxes are plenty, here a few: Lehle P Split Palmer PLI01 Radial etc Quote Link to comment Share on other sites More sharing options...
rudomat Posted January 22, 2016 Author Share Posted January 22, 2016 Iso box between helix and amp in, fixed. One should always have an isolator box for such issues. Switching and audio on common ground is normal for amps really. front input or fx loop return input...? thanks Quote Link to comment Share on other sites More sharing options...
jaeger28 Posted January 22, 2016 Share Posted January 22, 2016 front input or fx loop return input...? thanks Front input. You have to break the loop at one point, this is the easiest one. If you isolate at the fx loop you need a dual box to isolate both, send and return. Quote Link to comment Share on other sites More sharing options...
rudomat Posted January 22, 2016 Author Share Posted January 22, 2016 Front input. You have to break the loop at one point, this is the easiest one. If you isolate at the fx loop you need a dual box to isolate both, send and return. ok...i´ve got an ebtech hum eliminator here...and it says line level only...so that won´t work, right? Quote Link to comment Share on other sites More sharing options...
jaeger28 Posted January 22, 2016 Share Posted January 22, 2016 ok...i´ve got an ebtech hum eliminator here...and it says line level only...so that won´t work, right? That one is specially designed for fx loops. I think it has two iso chains, one for send, one for return. So it should work in the loop. Quote Link to comment Share on other sites More sharing options...
rudomat Posted January 22, 2016 Author Share Posted January 22, 2016 you mean both ways...like that? 1. amp send -> ebtech -> helix return and 2. helix out -> ebtech - amp return can i use normal TS cables or does it need TRS...? thanks! Quote Link to comment Share on other sites More sharing options...
Giax1974 Posted April 18, 2017 Share Posted April 18, 2017 Hi, I have the same issue, when connecting the EXT AMP it adds a loud hum.Read about 2 solutions, 1 HumX, and the other humbuster cables... Any ideas? Quote Link to comment Share on other sites More sharing options...
JeffMarshMusic Posted May 2, 2017 Share Posted May 2, 2017 Ebtech did not work for me. There is another thread on the forum that says to disconnect the "sleeve" cable on the Helix end. My Mesa needs to close the connection between ring and sleeve, so I'm not sure what will do. RJM makes a box that will receive midi and channel switch using relays. Quote Link to comment Share on other sites More sharing options...
JeffMarshMusic Posted May 3, 2017 Share Posted May 3, 2017 Update: I tried many combinations of cable modifications, swapping the shield to tip, disconnecting one end etc, etc, and nothing made the hum go away. My Mesa Royal Atlantic needs to see Ring/Sleeve closed in order to switch. I tested the RJM Amp Gizmo which I have in a larger rack setup. It worked perfectly. RJM makes a few different switching units. Their smaller "Switch Gizmo" features TRS amp switching, so I am ordering one of those. Average price is $159.00. I'm guessing this is a hardware design issue, in that the relays seem to be grounded instead of isolated. If you can't modify a cable to make this work, I recommend RJM. Quote Link to comment Share on other sites More sharing options...
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