Hi, I have a question for the group. At about 30% of the venues I play at, an electrical noise is introduced to my audio chain if my laptop’s power supply is plugged into wall outlet. However, If I unplug the power supply from my laptop, the noise goes away. Noise is similar to a DI that has ground/lift switch set to wrong position. Here’s my hardware chain:
Laptop to Behringer UMC204HD (USB powered) using TS 1/4" main outs to Radial stereo DI to XLR’s to sound system. My laptop power supply is connected to a Furman AC-215A power conditioner which is connected to venue’s power outlet.
Any ideas what is causing this, and if I have a way to clean up the venue’s power on my end?