The laptop connects through USB to the mixer and then from the mixer to the amp rack.
The company I work for has four identical DJ racks. While testing them before our busy season we noticed a loud hum through at least two of our racks and possibly the other two that haven't been tested yet. It always goes away when we unplug the laptop power supply. The supply is grounded and runs through the same power conditioner as the mixer. The laptop connects through USB to the mixer and then from the mixer to the amp rack. The hum does not come out of the headphones connected to the mixer and only comes through the amps. Any thoughts on how to fix this?
I believe that a 600 ohm isolation transformer (1:1) between the mixer output and the amp input should do the job safely, too. Mark C.
But his connection from laptop to mixer is USB. Sent from my iPad using Tapatalk HD
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