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HVX-300p- Audio distortion on lav mics

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Megan Evans
HVX-300p- Audio distortion on lav mics
on Sep 9, 2009 at 6:14:37 am

I am working with some interview footage that was shot on an HVX-300p, using a field mixer and in some cases, 2 or 3 lav mics were used. In the scenes where 2-3 mics were used, as opposed to 1 mic scenes (which are fine), the audio is way over-modulated and distorted. These mics were ran through a field mixer and sent back to the camera as left and right channel inputs (Ch. 1 and 2). The camera levels were set to Auto. Testing the mics and mixer back in the office today, it was determined that the mics and mixer are fine, isolated from the camera. Is there some audio setting we're overlooking on the camera, or has anyone had a similar problem when using this camera?

We're somewhat newbies on this camera... coming from Beta SP and the analog world...

Any help would certainly be appreciated.

Thanks!


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David Jones
Re: HVX-300p- Audio distortion on lav mics
on Sep 9, 2009 at 3:33:16 pm

Hi Megan,

Without seeing how you actually set up the gain structure with the camera, it's hard to say what you might need to do differently.

Are you using wireless mics? Is the limiter set to "on" on the mixer? What's the audio gain level set to (in the audio set-up menu)?

I hate to be "that guy" but this is why you need to monitor the audio in the field, using headphones plugged into the camera, or send a return to the mixer. Meters on these cameras can tell you the levels are correct when you're actually recording distorted or clipped audio.

Sorry about your recording.

Dave


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Megan Evans
Re: HVX-300p- Audio distortion on lav mics
on Sep 9, 2009 at 4:06:45 pm

Hi David,

Thanks for your help. I will check the gain settings in the camera (we're new to this camera) and see. We monitored audio through headphones in the field, both on the camera and on the mixer. This distorted audio was caught in the field, albeit too late, but the rest of the shoot (2 days) went smooth with great audio. The guys shooting it say they did not change anything to correct the bad audio in the field, so it's kind of a mystery...

Thanks again!
M


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Megan Evans
Re: HVX-300p- Audio distortion on lav mics
on Sep 9, 2009 at 4:19:03 pm

Hi again David,

Some updated info on your questions:

The Rear Mic inputs (ch. 1 and 2) are set to -60Db in the camera audio settings menu. Those are the two channels we were using in the field.

I did notice that our firmware is 9.19 and I've seen that we need to upgrade to 9.28. Could this be a factor for our audio issues? Also, yes, the mixer limiter is ON.

Thanks again,
M


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