Using Lo-freq roll-off when recording location sound!

Z

ziz9cp

New member
Hi,

I was wondering if anyone could help me out with this burning question.

When recording dialog, would it be necessary to engage the lo-frequency roll-off on the microphone? And would this apply to recording room tone? Or should the roll-off be disengaged during room tone?

Please and Thank You!
Z.
 
I think whether to roll off or not depends on the situation and the mixer. Personally I'm always rolling off at 80 for FX work and I can't imagine why one wouldn't for production. As a post person I'm usually rolling off production also to get rid of rumbles and mud. But it depends on the voice and the show and how much junk is down there.

Room Tone should be recorded exactly the same as the production.
 
Unless you are recording a (rare) Russian "Oktavist" singing, almost nobody's voice goes below 80Hz (E2) if you can detect a difference in speech with an 80Hz high-pass filter engaged, then your filter has very shallow shoulders. In places with lots of LF noise, you are preserving your dynamic range by eliminating LF noise as soon as possible in the audio chain.
 
Same here.

Sometimes I'll sweep way up to 150-180Hz and use the roll off to control very deep voices or a lav that's capturing a lot of chest resonance.
 
Also, mind if the roll-off is pre or post the ADC. On many lower cost recorders, the roll-off is digital and does not prevent preamp overload.
 
+5. If you're working in post, try to find out the level of experience of the crew and allow enough time accordingly, there's probably a ratio chart around somewhere.

Cheers.
 
Would you consider 12db/octave especially steep? I have the akg se300b/ck93 combo and thats what the specs say the slope on that hp filter is. Cutoff freq is 75 hz.
 
You'll find that on a lot of mics, but as has been said here, try it out.

Every recording situation will be different, make sure you have a good audio monitoring system ie: headphones. Set up some trials and record some tests with and without. Keep them on file to play every now and then as you learn the rig.

Cheers.
 
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