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Author Topic: Wireless lav audio problems  (Read 1963 times)

Matt Hill

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Wireless lav audio problems
« on: February 04, 2021, 02:15:00 pm »

Hi everyone, new member here with frustrating audio problem.

I am using Sony UTX-B03 transmitters with URX-P03D receiver and Auto Set the frequencies at each shooting location. I keep coming back with terrible audio that almost sounds as if the signal is struggling. Examples of the audio can be found here:

Distorted File 1

Distorted File 2

When I return to my studio and check the mics without changing any settings at all, they will always sounds fine and work fine. Can anyone help with what the problem could be or what is causing the audio loss? It is happening with all 6 of my mics so is not faulty equipment.

Many thanks in advance.
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Lee Buckalew

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Re: Wireless lav audio problems
« Reply #1 on: February 04, 2021, 02:20:24 pm »

Hi everyone, new member here with frustrating audio problem.

I am using Sony UTX-B03 transmitters with URX-P03D receiver and Auto Set the frequencies at each shooting location. I keep coming back with terrible audio that almost sounds as if the signal is struggling. Examples of the audio can be found here:

Distorted File 1

Distorted File 2

When I return to my studio and check the mics without changing any settings at all, they will always sounds fine and work fine. Can anyone help with what the problem could be or what is causing the audio loss? It is happening with all 6 of my mics so is not faulty equipment.

Many thanks in advance.

What are you recording onto?
What is the signal path for the audio?

Lee
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Mike Caldwell

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Re: Wireless lav audio problems
« Reply #2 on: February 04, 2021, 02:50:58 pm »

When you check the system after the fact are you using the exact same set up?
Like Lee asked what is the set up?
I sounds like some heavy compression expansion pumping going on.
What does it sound like monitored directly from the wireless receiver?
Do you have the issue with just one mic turned on?

Matt Hill

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Re: Wireless lav audio problems
« Reply #3 on: February 04, 2021, 03:06:16 pm »

When you check the system after the fact are you using the exact same set up?
Like Lee asked what is the set up?
I sounds like some heavy compression expansion pumping going on.
What does it sound like monitored directly from the wireless receiver?
Do you have the issue with just one mic turned on?

Thanks for the replies. Set up is XLR direct into Sound Devices 702T.
I agree it sounds like heavy compression but can't be because it is the exact same set up when returned to studio - not a single setting changes on any device. And it sounds beautiful.
Have also tried this capturing into MixPre-6 and same problem.
Yes, issue remains with one mic on. I can have 2 mics running and different amounts of the problem with each mic. Monitored directly from receiver sounds exactly same problem.
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Lee Buckalew

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Re: Wireless lav audio problems
« Reply #4 on: February 04, 2021, 03:53:24 pm »

Thanks for the replies. Set up is XLR direct into Sound Devices 702T.
I agree it sounds like heavy compression but can't be because it is the exact same set up when returned to studio - not a single setting changes on any device. And it sounds beautiful.
Have also tried this capturing into MixPre-6 and same problem.
Yes, issue remains with one mic on. I can have 2 mics running and different amounts of the problem with each mic. Monitored directly from receiver sounds exactly same problem.

Are you running on Battery onsite but DC adapter in the studio?

Lee
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Mike Caldwell

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Re: Wireless lav audio problems
« Reply #5 on: February 04, 2021, 06:42:53 pm »

Does this happen every time you go out on location anywhere or is it just at one
location?

I want to say a companding setting issue on the receiver but.....that would not explain why it works in the studio, yes I looked up the receiver.

Martin Morris

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Re: Wireless lav audio problems
« Reply #6 on: February 04, 2021, 07:18:30 pm »

When you check the system after the fact are you using the exact same set up?
Like Lee asked what is the set up?
I sounds like some heavy compression expansion pumping going on.
What does it sound like monitored directly from the wireless receiver?
Do you have the issue with just one mic turned on?

LINKY
https://cdn.sounddevices.com/wp-content/uploads/2020/08/702t_UserGuide.pdf

it could be a similar issue with the MixPre-6 - try reducing your input from the Sony into the sound devices. Also watch for the "limiter" LED. It should engage now and then or not at all, and should not be "ON" permanently.

Just a thought ... cheers Martin
« Last Edit: February 04, 2021, 07:26:54 pm by Martin Morris »
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Mike Caldwell

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Re: Wireless lav audio problems
« Reply #7 on: February 04, 2021, 08:22:32 pm »

LINKY
https://cdn.sounddevices.com/wp-content/uploads/2020/08/702t_UserGuide.pdf

it could be a similar issue with the MixPre-6 - try reducing your input from the Sony into the sound devices. Also watch for the "limiter" LED. It should engage now and then or not at all, and should not be "ON" permanently.

Just a thought ... cheers Martin

And the only thing that is not the exactly the same as on a location shoot when testing in the studio
is the person at the mic! Maybe the studio test is with a softer spoken person and or different mic positioning not driving the recorder as hard.

Pete Erskine

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Re: Wireless lav audio problems
« Reply #8 on: February 05, 2021, 12:08:07 am »

I am using Sony UTX-B03 transmitters with URX-P03D receiver and Auto Set the frequencies at each shooting location. I keep coming back with terrible audio that almost sounds as if the signal is struggling. Examples of the audio can be found here:

Sounds like the TX are overloaded.  Turn down the gain on the mic pre and make sure the mics are 6" from the speakers mouth - also sounds like hey are too close.
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Russell Ault

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Re: Wireless lav audio problems
« Reply #9 on: February 05, 2021, 03:46:24 am »

[...] I agree it sounds like heavy compression [...]

I'll buck the trend: to me it sounds like (slow) gating, not compression. To my ears it sounds like the level increases just after the speaker emphasizes a word.

To continue bucking the trend, my vote is that the RF isn't being driven hard enough, and that the reason it works in the studio but not in the field is that your location talent is quieter and/or being mic'ed at a greater distance-to-mouth than your in-studio tests.

I'm surprised no one has asked this yet (since, to my mind, it's the first question to ask when troubleshooting an RF-related gain-staging issue): what do the levels on the TX (or, if you can trust that they're the same, the RX) look like while the mic is on the talent? No point in trying to adjust levels on the recorder if the RF stage isn't gained properly (especially with FM RF, which cares about gain-staging more than just about any other audio device).

-Russ
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Re: Wireless lav audio problems
« Reply #9 on: February 05, 2021, 03:46:24 am »


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