Power a Boom mic

[Stefan Hegenberg]

Hi guys,
we want to record sound directly to the Epic from a boom. If we put the XLR into the wooden A-Box we get no sound. I think the mic get no power via a-box. We also tryed this with the Sennheiser ew112 G3 but the boom got also no sound. On a FS700 we got directly sound. How do you use your boom mic?

 

[Nick Fury]

Hi Stefan,

Is there audio on an r3d? If not...

You need 48v phantom power, for a non powered mic which the A box does allow. Are you sure you have the turned on in the Audio tabs options? Also, are you seeing the "L,R" bottom right corner of display bars vary on test? If you are that far and can't hear anything on headphones, out the camera, the next thing is to be creative the Headphones are "ACTIVE." The button for that seems "ON," when text is black, but it is not. Press that and it turns RED=active.

Thank you very much

Fury

 

[Brian F Kobylarz]

Confusing post that could use a bit more background - what mic is on the boom to start with?

Also, the Sennheiser ew112 G3 is a wireless lav to a box / rackable receiver. Do you mean the ew112-P which has a camera mountable receiver?
Are you affixing a lav to the end of a pole or just using the wireless to test the A-Box/EPIC connectivity?

 

[Stefan Hegenberg]

Sry for the missed infos.
The mic in the boom is a Sennheiser shotgun. I don´t know wich mic exactly now. We tried to go from mic with xlr to the A-box into the camera. We had no levels on display. If we use a Rode standard mic, we got levels on display and sound. We just tried the adapter for handmic http://static.bhphoto.com/images/images345x345/Sennheiser_EW112_p_G3_SKP_300_G3_859432.jpg (up in the left side) to give the boom mic some power and get the sound wireless. It did not work.
It must be a power problem from the mic.
@ Nick: how do i get the 48v phantom power? Normaly it comes throuw the xlr from the camera , right? Should it come if i go from the mic to xlr over to 3.5mm directly into the camera?

 

[Ted Parkes]

Go into Menu / settings / Audio / Channel and check the box for 48v power. I run a shot gun through my WC a-box all the time.

cheers

 

[Stefan Hegenberg]

Go into Menu / settings / Audio / Channel and check the box for 48v power. I run a shot gun through my WC a-box all the time.

cheers

i will check this directly tomorrow. THANKS!

 

[Nick Fury]

Go into Menu / settings / Audio / Channel and check the box for 48v power. I run a shot gun through my WC a-box all the time.

cheers

Hi Ted,

Spot on, of course. What mic do you favor, for that configuration and have you had any issues, with going to camera and later processing the audio? What work flow do you use, if you do process the in camera recorded audio?

Thank you very much

fury

 

[Zach Love]

I'm just going to chime in with a couple things:

In a very overly simplistic breakdown there are two types of shotgun / boom mics: those that are self powered & those that need P48 (phantom power 48 volt).

The Sennheiser ME66 (a popular budget mic) is a mic capsule that needs either the K6 or K6P power module. The K6P needs P48 while the K6 can use either P48 or a AA battery to power the mic. You can unscrew the K6 / K6P from the ME66 & switch up the combo that you want to use. (The K6 / K6P can also power some other Sennheiser mics.)

The Rode NTG-1 & NTG-2 use the same mic element & are a single body (you can separate the mic element from the power module). The difference between these two is the NTG-1 is smaller & needs P48 while the NTG-2 is longer & can use either P48 or a AA battery.

If you want to put a boom mic on a wireless mic your transmitter the mic has to be either self powered or the transmitter will need to provide P48. A Lectrosonics UH400 has P48, a Sennheiser SKP 100 doesn't.

So if you have a Sennheiser SKP 100 you'll need something like a Rode NTG-2 or Sennheiser ME66/K6 (along with a fresh AA battery in the mic, obviously).

 

[Mike Garrick]

Hey Zach

Great info in the dark art of audio mics .

Thanx