Recommendations:
try unplugging the computer power supply
try using a different USB port
eliminate possible ground-loops
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how to stop humming sound coming from speakers when board is plugged in.
I have a DDJ-SB controller and when i plug into cpu and turn speakers on I get a humming sound. I have plugged from head phone jack and also from phone and never had humming only when I plug in controller. I have made sure speakers are grounded using same power supply. Hope to hear back soon I have gigs every weekend and it is really becoming a problem. Thanks for any response.
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I have had the same problem with my old DDJ-S1.
It was not the computer power supply. Even on Battery i got a permanent noise and noises !
But a ground loop between DDJ-S1 USB and HDMI mass of my beamer.....
i've bought an USB ground loop isolator :
USB isolator HIFImeDIY ADUM4160.
It's night and day, no noise any more....... my DDJ-S1 have a second life.
I don't understand why DDJ-S_ unit are not natively protected from GROUND-LOOP via USB Mass or sector.
I will upgrade with a DDJ-RX or a DDJ-SR, but i've read that the are a lot of ground loop problem.
My another USB DAC with the same PC dont need a USB GROUND LOOOP isolator.
Only the DDJ-S1
Please, protect more your expensive units from GROUND-LOOP with built in mass filter . it's kill the very good pionner sound quality.
If my experience can help. just add and USB ground looop isolator
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