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[Bob Faulkner]

A church I occasionally volunteer with experienced an audio problem today with their live stream.  They are using a 32 chnl Presonus (AI model); console only mixing, no IPAD.  One of the monitor sends is used for a podcast and to supply audio to a YouTube streaming service.  I was not there during this service.


https://www.youtube.com/watch?v=kxbhb8PAAsw&feature=youtu.be

What the heck is that sound?  It was not in the house mix, only in the streaming audio.  The entire video has this audio problem with it.

[David Pedd]

A church I occasionally volunteer with experienced an audio problem today with their live stream.  They are using a 32 chnl Presonus (AI model); console only mixing, no IPAD.  One of the monitor sends is used for a podcast and to supply audio to a YouTube streaming service.  I was not there during this service.


https://www.youtube.com/watch?v=kxbhb8PAAsw&feature=youtu.be

What the heck is that sound?  It was not in the house mix, only in the streaming audio.  The entire video has this audio problem with it.

Monitor send cable not plugged in all the way?

[Bob Faulkner]

Monitor send cable not plugged in all the way?

Thanks for the reply..

I'm not sure, but I kind of doubt it.  The board and all connections are always setup; once we got it installed, there was no need to disconnect/re-connect anything to it.

[Chris Grimshaw]

It almost kind-of sounds like you're running XLR outputs into a 1/8" jack input on a camcorder, which is expecting mic levels, and is also supplying some bias voltage for the mic capsules.

It's a distorted mess, but I think there's some correlation between what's happening on-stage and the sound.

What's the exact signal chain used, please?
Any problems like this before?

Chris

[Marcus Baeumler]

...
What the heck is that sound?  It was not in the house mix, only in the streaming audio.  The entire video has this audio problem with it.

It sounds like a completely distorted audio signal. Then I think it also sounds like a feedback loop of a delay FX. Any chance that you created a loop with the aux output/return and the delay sends/return?

[Bob Faulkner]

It almost kind-of sounds like you're running XLR outputs into a 1/8" jack input on a camcorder, which is expecting mic levels, and is also supplying some bias voltage for the mic capsules.

It's a distorted mess, but I think there's some correlation between what's happening on-stage and the sound.

What's the exact signal chain used, please?
Any problems like this before?

Chris

It's certainly distorted, but it doesn't sound like an audio signal... at least one that follows their program.  Even when the girl is just talking, the distortion/noise is nearly the same as when their program started.  They have an audio feed from a Mac (backing tracks and break music), though, there was no mention of this noise in their FOH (which I think rules out a problem with any source material).

Signal path is:  mics/MAC --> presonus board (--> monitor sends), (--> FOH) --> FOH speakers.

It sounds like a completely distorted audio signal. Then I think it also sounds like a feedback loop of a delay FX. Any chance that you created a loop with the aux output/return and the delay sends/return?

Thought that as well, but the noise continues on past their service; if it was a feedback loop, it appears to run for infinity.  I'm not sure what they have setup for FX.  When I was there on a regular basis, it was just reverb and little delay; all handled "internally", i.e. no returns to spare subgroups.

[Bob Faulkner]

It almost kind-of sounds like you're running XLR outputs into a 1/8" jack input on a camcorder, which is expecting mic levels, and is also supplying some bias voltage for the mic capsules.

It's a distorted mess, but I think there's some correlation between what's happening on-stage and the sound.

What's the exact signal chain used, please?
Any problems like this before?

Chris

Good thought.  They do have an audio feed into their camera (from one of the monitor sends), however they haven't used that feed in months.  The audio (for their streaming) comes from a different monitor send.  Perhaps someone used a different audio feed for YouTube (I'm not sure if that's even possible).  Though, the audio feed to the camera (when it was last used) ran consistently 12-18db below -0- (as referenced on the camera).  I may need to stop by and take a look.

[Rob Spence]

If you don't already have it, perhaps an isolation transformer on the feed?
I always protect my desk with one if connecting to a non-pro input on other gear.


Sent from my iPad using Tapatalk HD

[David Allred]

I would connect a powered speaker to the output used for the stream to see if the problem goes or stays.  then you know which way to go to the next stop-gap.

[Stu McDoniel]

A church I occasionally volunteer with experienced an audio problem today with their live stream.  They are using a 32 chnl Presonus (AI model); console only mixing, no IPAD.  One of the monitor sends is used for a podcast and to supply audio to a YouTube streaming service.  I was not there during this service.


https://www.youtube.com/watch?v=kxbhb8PAAsw&feature=youtu.be

What the heck is that sound?  It was not in the house mix, only in the streaming audio.  The entire video has this audio problem with it.

Start with a hard reset of that Presonus.  Plug something into that monitor out and see what you get.

[ProSoundWeb Community]