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Line to Mic level

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Line to Mic level

Postby twotoedsloth » Thu Nov 15, 2012 8:16 pm

Hello,

Is there an easy way to pad a balanced +4 line level signal (out of a mixer) down to an unbalanced microphone input (1/8" TRS) on a camcorder?

What I'm trying to do is take the audio out of my mixer and put it on the video to save time synching it up after the fact.

Thanks,

Peter
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Re: Line to Mic level

Postby Stuarto » Fri Nov 16, 2012 8:38 am

I'm not saying it's the best way to do it, but I have achieved a similar thing by feeding a line level signal into the input of a DI box, engaging the pad on the DI and taking the attenuated signal from the output.
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Re: Line to Mic level

Postby Jack Ruston » Fri Nov 16, 2012 10:05 am

I use them all the time. I had a tech make up a couple of cables similar to these designs http://www.uneeda-audio.com/pads/

I use them to feed line level signals to coloured preamps for mixing.

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Re: Line to Mic level

Postby shufflebeat » Fri Nov 16, 2012 11:12 am

TRS implies it may be a stereo signal. Do you know if this is the case?

Depending on the model of your camcorder there may be a gain level on the mic input which opens up a few more possibilities. Might be worth investigating.

Great link that, Jack.
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Re: Line to Mic level

Postby SafeandSound Mastering » Fri Nov 16, 2012 12:36 pm

The official device was known in the video production industry as "beach box" although this is
a nickname.

I now know why, as this company makes such devices:

http://www.beachtek.com/

1/8 inch does often imply stereo on a semi pro camera, a DI (or 2) would be a hassley and slightly impractical but working lash job if you can get the adapters you need. When I started work experience at a Radio and TV production company within 2 weeks I had to oversee the kitting out of a video black/chroma key room with a very let say "firey" producer. My manager at the time dropped me right in the deep end, lol.

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Re: Line to Mic level

Postby twotoedsloth » Fri Nov 16, 2012 4:36 pm

Thanks for the link to the beach box, that might be just the tool for the job.

By the way, you are correct, the 1/8" TRS is for a stereo microphone. I read somewhere that the 1/8" TRS mic jacks put out 5 volts of "plug in power" sort of like the poor cousin to phantom power.
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