Horrible hum with Co-Pilot

Former Member

Hey everybody. I just bought a QSpand Mixer and run it side by side with the Co-Pilot. When the Co-Pilot is turned on and there is no audiop through the mixer there is a HORRIBLE noise (not nbecessarily a hum but a high pitched tone) that comes from the speakers. (Mpro 415). When I turn the Co-Pilot switch off the tone lessens and when I totally unplug the relay pack, it goes away. Obviously it has osmething to do with the Co-Pilot. How can I solve this annoyance? I was considering buying an isolation transformer but then figured A) why spend the money and B) this should not be a problem - especially when using two components made by the same company. Any ideas?

8/27/0412:18 PM

❤️ 0

Original Post

Replies sorted oldest to newest

Former Member

How/where are the units plugged in? Do you use a power conditioner? Also it is always good practice to keep your audio and lights on seperate circuits whenever possible. If you run your audio and lights on the same circuit you will likely run into problems tripping breakers at many venues.

8/27/0412:53 PM

❤️ 0

Former Member

It sounds like a ground loop caused by the power run from the relay pack to the controller. Are they rack mounted? You may need to isolate the controller using plastic washers. If they are side by side, it may help by moving the controller away from the mixer.

8/27/041:00 PM

❤️ 0

Former Member

For sure it's a grounding problem but it may be caused by the actual wires at your location. You can try to plug the units into different circuits (circuits that go to different circuit breakers) and as SKILZ has suggested isolate either one or both of the units from common metal.

8/27/041:25 PM

❤️ 0

Former Member

Many older buildings cross the ground and hot wirs throughout the wireing system. Because it's AC (alternating current)usually no one ever knows or cares. This is not to be confused with Earth Ground (green third wire)

8/27/041:37 PM

❤️ 0

Former Member

I always run audio and lighting on seperate circuits. I have moved them apart in the rack and still the same problem. I will try the plastic washers this weekend and let you all know. Thanks

8/27/043:26 PM

❤️ 0

Former Member

If the washers do not work try one more thing. If possible plug in or run the gear in another building. If that doesn't change anything then you may want to send items in for checking. You would have to contact our service department.

8/27/043:35 PM

❤️ 0

Former Member

If you had the relay pack right by your mixer and your mixer inputs were turned up maybe your mixer picked up the electrical interference that the relay pack resistors give off.

8/29/045:36 PM

❤️ 0

Former Member

you have an electrical interference coming thorugh your rca's, only way to stop it is to move the co-pilot away from the mixer OR get some better rca's such a monster cable etc..
I had an identical problem only with different equipment but i use turntables so. it might be different? i dont know

9/2/045:16 PM

❤️ 0

Skip to main content

Add Reply

Membership Required

Remove From Your Block List

Manage Follow Preferences

Block

Please wait...