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hum on videos

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Wesley Key:
Good evening,

It has come to my attention that the videos that our church posts to youtube have a loud hum.  This hum is present no matter which microphone we use.  No hum is heard over the church speakers, but only on the videos.  Any help would be appreciated.  Here is a sample video with the issue --- https://youtu.be/WjJDrTw_u-0

Scott Holtzman:

--- Quote from: Wesley Key on October 15, 2023, 08:55:25 PM ---Good evening,

It has come to my attention that the videos that our church posts to youtube have a loud hum.  This hum is present no matter which microphone we use.  No hum is heard over the church speakers, but only on the videos.  Any help would be appreciated.  Here is a sample video with the issue --- https://youtu.be/WjJDrTw_u-0

--- End quote ---


You have a ground loop issue.  You need to provide details on the system.  Since it is not in whatever output feeds the PA from the mixer that means it is downstream of the output that feeds the live threads.


If you are not using a dedicated caster with balanced inputs you should at least have a decent interface on the computer that is feeding the broadcast.  I highly recommend using a program like Open Broadcaster (it's free) for any live broadcasts you do. 

Steve-White:
A simple block diagram of the system would be very helpful.

Brian Jojade:
Most definitely sounds like a ground loop.

The solution to this problem likely will be as simple as an isolation transformer between the mixer and the computer. These can be called many different things.  Prices range from about 10 bucks for a cheap one, to a couple hundred for active ones.  Start with the cheap one, since it's a low investment.  You can probably find them locally at any audio shop. They are commonly used in automotive installs as well.

If you're using a laptop, you can also try running off battery. In many cases, this eliminates the ground loop as well.  You may be tempted to lop the ground pin off of the power supply too.  Not recommended, but could eliminate the noise.

Steve-White:
#1 most probable cause is a ground loop.  Beyond that, the next thing to look into is the power supply for the computer.

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