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Post by stormymondays on Apr 9, 2021 3:16:02 GMT -6
This is a follow up to my topic about digital clicks (that I will update with this), where I was having a problem on start/stop. Well it gets weirder.
I have realized that I'm getting clicks whenever I bypass any hardware unit, but only when they are passing sound. I'm getting clicks with my Chromas when switching from A to N, clicks on my EM-PEQ when switching from bypass, same on my Weight Tank, etc.
The little knowledge I have on this points to DC offset, but that's all I know! I also believe this started to happen little by little.
Stuff I have ruled out: -It happens on headphones too, so it's not on the monitor controller/monitors. -It happens if I send signal from the DAW to an external piece of hardware and crudely plug that into a headphone amp+headphones. So it seems to be caused by the D/A conversion? -It happens across all DACs. I have two additional units connected by ADAT lightpipe to my RME Fireface 802. Another Fireface 802 and one Focusrite Clarett. It doesn't matter where a unit is connected. I have some that go in/out the same DAC, some that go out of one and into another.
All the hardware is connected to patchbays (Samson, quarter inch) and all the connections are balanced.
I welcome any testing procedures, ideas or hints. Thanks!
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Post by gouge on Apr 9, 2021 3:31:03 GMT -6
Wild guess but it could be you have a dodgey ground in one of your cables. Are your racks grounded?.
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Post by stormymondays on Apr 12, 2021 12:00:04 GMT -6
After talking with an electronic engineer friend of mine and some basic tests, I've ruled out DC offset. It would be extremely rare for it to be present in a recording studio, since mostly everything is designed to block CD. And anytime the signal goes through a transformer it would be eliminated too.
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Post by the other mark williams on Apr 12, 2021 14:02:36 GMT -6
After talking with an electronic engineer friend of mine and some basic tests, I've ruled out DC offset. It would be extremely rare for it to be present in a recording studio, since mostly everything is designed to block CD. And anytime the signal goes through a transformer it would be eliminated too. Have you checked a recorded region in Logic to see if there’s any DC offset? Go into the waveform editor and on one of those dropdown menus, there’s an option to “remove DC offset.” It’ll also tell you how much offset there was (if any). Next step will probably be eliminating the RME from the equation, maybe just trying to play a problematic file in Logic with your monitors hooked up to your Mac’s system sound or something.
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Post by stormymondays on Apr 12, 2021 14:50:56 GMT -6
Thanks for the suggestions. I haven’t done any proper troubleshooting since there’s a project I need to finish but I’ll get to the bottom of this, and probably learn something too! I’ve already learned that bypass switches on hardware can and do click often!
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Post by superwack on Apr 12, 2021 15:50:40 GMT -6
Have you tried it with ONLY one DAC connected to your computer? you might be getting some funky competing clock where 2 units are trying to be the "master" or one might be sync'ing to it's own clock thus is starting/stopping out of sync with the others, etc.
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