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Periodic pop/crackle

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I’m using a Helix Rack.  Using digital output is 48khz and connected to Scarlett 18i20 via the RCA digital socket.   If I have the clock set to internal or external in the Scarlett control I sometimes get loud pop/short crackle in my speakers.   I’m using Logic Pro and project is set to 48khz.


Wondering if I should the analog outs, will the sound quality be much lower?

Any ideas on how to resolve?   Thanks. 

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No. I don't want to promote specific ones since I don't have experience with one. Search for digital RCA cable. Just don't use a standard RCA cable since these usually don't have the right wave impedance to prevent signal reflections.

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