Alex Smith
Member
Of course, this is a show in a space not intended for or designed for theatrical productions, which should have made me shy away but I never learn.
Running Qlab 4 for lights and sound on a 2016 MacBook Pro, into a GigaPort via USB, and out the GigaPort into a long 3.5mm cable (I know, I know) that runs to an amp and speakers that are part of the venue.
Also running a USB to 3pin DMX USBKing adapter out of the same laptop and to the DMX run for the lighting equipment (3 shoebox dimmers and 4 cheapo LED pars), and the run is terminated.
Classic Ground Loop hum (buzz) that's exacerbated when the conventionals dim. Ran Amp power to a new circuit on a different breaker. Also tried running with the laptop not plugged in to power. Buzz of course recedes only when DMX is unplugged from MacBook.
I've had ground loop issues when sound and lights share a circuit before, but this is my 3rd time in 3 separate venues (one designed for theatre, one not, and this one) running this Qlab LX/SX configuation and this is the first time I've encountered this challenge. I could run Wireless DMX from the Mac to the first dimmer pack if I had to, but I of course trust wired connections more.
Any thoughts? Research only turned this up: https://www.amazon.com/dp/B09BPZXF5Q/?tag=controlbooth-20
But don't quite have the time for it to make it to me before we go up.
Thanks for your time!
Alex
Running Qlab 4 for lights and sound on a 2016 MacBook Pro, into a GigaPort via USB, and out the GigaPort into a long 3.5mm cable (I know, I know) that runs to an amp and speakers that are part of the venue.
Also running a USB to 3pin DMX USBKing adapter out of the same laptop and to the DMX run for the lighting equipment (3 shoebox dimmers and 4 cheapo LED pars), and the run is terminated.
Classic Ground Loop hum (buzz) that's exacerbated when the conventionals dim. Ran Amp power to a new circuit on a different breaker. Also tried running with the laptop not plugged in to power. Buzz of course recedes only when DMX is unplugged from MacBook.
I've had ground loop issues when sound and lights share a circuit before, but this is my 3rd time in 3 separate venues (one designed for theatre, one not, and this one) running this Qlab LX/SX configuation and this is the first time I've encountered this challenge. I could run Wireless DMX from the Mac to the first dimmer pack if I had to, but I of course trust wired connections more.
Any thoughts? Research only turned this up: https://www.amazon.com/dp/B09BPZXF5Q/?tag=controlbooth-20
But don't quite have the time for it to make it to me before we go up.
Thanks for your time!
Alex