H90-digital hash on the output

[zambiland]

Hi,

I hooked up my H90 in my home studio going 1/4″ (with and without a Radial isolation box) and XLR via a passive DI to a Metric Halo ULN-8. No matter how I do it, with ground lifts or not, I get a digital hash sound on the output at about -45-50db. It’s been dead quiet for the most part.

 

Any ideas?

 

 

[joecozzi]

Do you have USB hooked to your computer as well? Depending on your setup, this may cause a ground loop.

[zambiland]

I’ve tried it both ways. No difference

[joecozzi]

What else do you have connected to the H90?

[RikjCarty]

Try plugging everything into the same leg (i.e everything on the same power source/Plug… including computer, as a starting point). For some reason control apps via USB are Notorious between computer connection and isolated switching supplies. With 2 prong supplies… you CAN reverse the polarity of the AC plug. In some low cost, 2 prong (US) switchers, this changes the ref ground.

Best!

[zambiland]

I’ve made sure it’s plugged into the same leg as everything else (I have a dedicated circuit for audio). I have switched power supplies. I’m going to do some more experiments, including plugging it into a battery powered headphone amp.

[Author]

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