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Old August 21st, 2007, 03:29 PM   #1
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Audio help.

I just purchased my first wired lav mic AT899 and when I did some test shots I had a lot of noise. i had non professional talent that didn't talk loud but the audio level didn't move. My settings were -20db audio level and -50db mic level. I also had my shotgun mic on.
I am really trying to improve my audio but find it difficult to see on the audio meter. if I crank up the volume, i et a lot of noise. I use senn hd280 headphones.
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Old August 21st, 2007, 03:41 PM   #2
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Was your input for the lav set to mic level or line level? If it is line level then you will get a very weak signal from the mic. Also, I don't think you would ever need to use +48V with a lav.

Did you try -60dB pad? Could the battery in the lav be dead?
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Old August 21st, 2007, 05:22 PM   #3
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It was set to mic+48 no battery installed in lav. You thinkng switchng to 12db would be better? I hate the indicator level in monitor and wish I coluld hook it up to something better to view.
I will be running a another test tommorrow. My talent has a very soft voice which increasing the volume just adds noise.
I also just recieved Jay Rose book producing great sound for video and looking to get the best sound from this camera.
Thanks for the quick reply
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Old August 21st, 2007, 06:31 PM   #4
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Originally Posted by Joe Bowey View Post
It was set to mic+48 no battery installed in lav. You thinkng switchng to 12db would be better? ...
You need to install the battery in the lav power supply and turn off phantom power.

In a better scenario, you would go through a mixer w/ good limiters and send line level at -12 to the camera.
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Old August 21st, 2007, 11:22 PM   #5
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Originally Posted by Jim Boda View Post
You need to install the battery in the lav power supply and turn off phantom power.

In a better scenario, you would go through a mixer w/ good limiters and send line level at -12 to the camera.
**some** ( ok very few) lavs will take power via phantom. it depends on their power module. usually this requires a ambient emuel, or equavilant 3rd party module. factory ones tend to be internal battery only. I've got one that goes XLR->TA5 so I can use my lectro wired lavs on hardwire. super handy, but not cheap at $120 for 1. note that if you have phantom power on, and its not used by the mic, it will make the input noiser. I have a sony shotgun that will run from internal battery or phantom power, it doesn't care.

and as the other poster said, the best way is a external mixer, or premap and feed line level into the camera. Sound Devices makes a single and stereo preamp you could camera mount... but not cheap...and as always, you get what you pay for.
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Old August 22nd, 2007, 12:37 AM   #6
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You thinkng switchng to 12db would be better?
The reference level setting (-20dB or -12dB) only does two things: it's moves the little dot on the audio meters to indicate either -20 or -12, and it sets the level of the internal tone generator to either -20 or -12. It has absolutely no effect on the sound other than providing you a meter and tone reference for your headroom preference.
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Old August 23rd, 2007, 04:48 PM   #7
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We'll I layed back the video in the camera and the sound was great. Also no noise in headphones. I think when I captured the video using a consumer camera that it did not capture the sound correctly.
How come there is more noise in headphones while shooting but not in playback? I use senn hd250 headphones.
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