audio issue with Sennheiser mics and HPX170

B

bikinijack

New member
I was filming the other night with 2 sets of the Sennheiser ew 100-ENG G3 Wireless Clip-On Lavalier Microphone Sets. The mics and their bases were set to different frequencies and I used both 1 & 2 XLR inputs for the mic base units on my HPX170.

I set the channel 1 selection to input 1 and the channel 2 selection to input 2 (see photo) and put the input 1 and input 2 switches both to "on."

What was strange was that even though I was 15 feet or so away from the people talking, after downloading the film I shot into FCPX, it sounded as if my voice was mic-ed up also, almost as if something on the camera was recording my voice, it was loud and clear… It wasn’t a big issue because I was able to take those 2 tracks out of the sound (those tracks had some unwanted wind also), and the sound from the 2 lavalier mics sounded fine, but why was this happening???
 

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It's been a while but if memory serves me my HVX would record on-board even if the two inputs were being used. BTW why are you using +48v on those lav mics when they are battery powered?
 
Correct; the internal microphones on the camera are always recording (well, not in DV, but you probably weren't shooting that), and if you have the XLRs set up to channels 1 and 2, the internal mics will be on channels 3 and 4.

And also correct -- the "mic power" switches are not off/on switches for the inputs; they're off/on for supplying power to a connected microphone which doesn't have its own battery.
 
Thanks so much for responding scorsesefan and David. Just curious, what effect would having the +48v power to the lav mics turned on when filming?
 
Best practice says it's a bad move, but I have to admit that I've done it lots of times with no issues at all - doesn't mean I never will, but I suspect Sennheiser are sensible enough to build in some protection.
 
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