Apple Magic Keyboard 2 and Magic Trackpad 2 causing static in speakers

I recently upgraded to the Apple Magic Keyboard 2 and Magic Trackpad 2 and have noticed that my speakers have started buzzing and the buzz tone and volume changes when I type or click the trackpad.

I have a 2016 MacBook Pro with an Apple USB-C to USB-A dongle connected to a Behringer UMC204HD. 1/4 inch 16 gauge TRS cables run from the Behringer to two Gen 3 KRK Rokit 5's.

Does anyone have any insight in to how these bluetooth devices could be interfering with the wired speakers? Any known solutions or suggestions?

Thanks.