I am getting a 120 Hz electrical hum in both of my speakers and I have traced the source back to the RCA outputs from my PS Audio Directstream DAC. The hum goes away when I unplug my DAC, when I use a “cheater plug” on my PS Audio DS DAC power cord, or when I unplug the RCA cables from either the PS…

Try changing out the ac power cord with another one. Could be compatibility issues.

Yes, I have tried three different power cords. All three produce that 120 Hz buzz.

I assume there is no other equipment such as cable TV box hooked up to your audio system?

I suspect you have a piece of connected equipment plugged into a different house circuit than your other stuff. Common issue … (pun), I just had it happen with my piano keyboard, headphone amp, equalizer, and amp… one of the pieces I accidentally had plugged into another house circuit… HUMMMMMMM… …

Thanks Bruce. Currently my system is pretty simple: PS audio, Rega P6, and the Prima Luna HP. All of these are plugged into the audio quest Niagara 1000. The only thing I have plugged into the PS audio DAC is the wired ethernet connection to my home network. Additionally, I have a power cord connect…

Hmm… did you try disconnecting your Rega? Disconnect everything… not just power cords… remove everything. Assume nothing. Peace Bruce in Philly

Isn’t there a phono preamp in the mix somewhere?

Check and see if the DS rca connectors are loose. I know people complained in the past about it. If loose…the connections will not make proper contact and could cause hum.

Yes, but I’ve removed it to isolate the system. The hum was still there.

They are a bit loose. How do I address that?

How to resolve a ground loop hum from my Direct Stream DAC

Audio Components DACs

mark-d September 4, 2018, 11:34pm 15

Paul recommended super glue. Loose rca jack on DS

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How to resolve a ground loop hum from my Direct Stream DAC

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