user-2468794 0 Posted December 30, 2017 Hi everyone. I'm using the following setup: Guitar to helix, 4 cable method to Carvin Legacy VL300 amp, amp to Carvin Legacy 412 cab, and xlr outputs to mixer then stereo cabs. I'm also feeding a stereo loop pedal via sends 3 and 4. So: Guitar -> Helix guitar in -> Helix Send 1 -> Amp In -> Amp Send -> Helix Return 1 -> Helix Send 2 -> Amp Return (i use the send 2 instead of the 1/4" out because this way the volume is not affected by the helix volume knob). Also: Helix Xlr Outs to mixer, and Sends 3 and 4 to Loop Pedal, then mixer. You can see the scheme in the picture Problem is, when i plug the guitar straight to the amp, there's no noise, no hum, everything clear on all chanels. When i plug the guitar to helix straight to mixer, with amp simulations, no noise, no hum, everything clear. When i use the 4CM, lots of noise. You can hear it in the video. first guitar straight to amp. then plug the guitar to helix guitar in, and the remaining 3 cables. And you'll hear the diference... https://youtu.be/D6eNThp-BkM Already tried: -change all the cables, audio and power. -plug the power to diferente places, then same place. -change the outs from line to instrument, and vice-versa. Nothing works. Any guesses?? Quote Share this post Link to post Share on other sites
Joepeggio 76 Posted January 1, 2018 Transformer Isolate one, or both of the loop cables. (not the guitar to Helix and not Helix to Amp input) Edit: Maybe amp input cable may work too. Since its low impedance grounded signal coming from Helix. 1 Quote Share this post Link to post Share on other sites
ColonelForbin 312 Posted January 1, 2018 Transformer Isolate one, or both of the loop cables. (not the guitar to Helix and not Helix to Amp input) This is what ya need to do! I use one of these; many options exist: (I run the two cables from amp fx loop send and return through this box to and from Helix send and returns) https://www.sweetwater.com/store/detail/Hum Quote Share this post Link to post Share on other sites
Joepeggio 76 Posted January 1, 2018 This is what ya need to do! I use one of these; many options exist: (I run the two cables from amp fx loop send and return through this box to and from Helix send and returns) https://www.sweetwater.com/store/detail/Hum Good choice. I haven't used that one yet, but we have a few of these (below) and they work well, though i have to admit, I do not use 4 cable. I like my 8 1/2 minute set up of guitar and vocal. ;) One thing I do like about the one below is its many I/O formats, and it converts between all of them. https://www.sweetwater.com/store/detail/DTI Quote Share this post Link to post Share on other sites
user-2468794 0 Posted January 1, 2018 Thanks a lot, I'll try this, had no ideia! Between those two options, any advice? Quote Share this post Link to post Share on other sites
vmoncebaiz 45 Posted January 2, 2018 The FX loops can be noisy when placed in front of certain amps (or even amp models). Try to use the 1/4" output instead of the second set of Send/Returns. See if the noise level changes at all. You could also try to use the 1/4" outs into the front of the amp, and put the Helix's send/return in the amps fx loop. Quote Share this post Link to post Share on other sites
JLondon 34 Posted April 14, 2020 My noise is coming from the USB to computer connection. Want to use USB connection so I can use Helix Edit but 4CM into my amp is impossible if connected to computer. Perfect otherwise. So I'm thinking that the Ebtech won't do me any good. I'm even able to create snapshots switching between a 4CM connection to amp AND L6 LINK to a Powercab plus with no noise. But plug in USB to computer and it's all over. Very frustrating! Quote Share this post Link to post Share on other sites
guitarman3001 0 Posted April 14, 2020 11 hours ago, JLondon said: My noise is coming from the USB to computer connection. Want to use USB connection so I can use Helix Edit but 4CM into my amp is impossible if connected to computer. Perfect otherwise. So I'm thinking that the Ebtech won't do me any good. I'm even able to create snapshots switching between a 4CM connection to amp AND L6 LINK to a Powercab plus with no noise. But plug in USB to computer and it's all over. Very frustrating! Same here! It is incredibly annoying. Everything works great. I'm using it in 4CM with my amp and there is no noise but as soon as I connect the USB cable to my computer it's buzz city! I'm not really sure how to fix this. Quote Share this post Link to post Share on other sites