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» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » non-sync audio bleeding through into feature (Page 2)

 
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Author Topic: non-sync audio bleeding through into feature
Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002


 - posted 02-23-2012 11:12 AM      Profile for Manny Knowles   Email Manny Knowles   Send New Private Message       Edit/Delete Post 
Maybe you want to verify with the incoming techs that they are setting playback levels at the processors, not the DA.

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David Zylstra
Master Film Handler

Posts: 432
From: Novi, MI, USA
Registered: Mar 2007


 - posted 02-23-2012 01:52 PM      Profile for David Zylstra   Email David Zylstra   Send New Private Message       Edit/Delete Post 
what Manny said . . . . . as I recall more bits and peices about the Smart equipment I worked with years ago - in our case there were 3 adjustments to tweak: 1) L/R output of the DA, 2) L/R input on the Smart, and 3) the overall non-sync volume. Note that I do not recall if the IIB and IIIB have the same input controls as the IV I worked with. Our bleed through "fix" was to find the happy medium (AKA no bleeding) between the output level from the DA and the input level at the Smart, then the overall non-sync volume knob could be used to adjust the sound level without much worry about bleed through.

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002


 - posted 02-23-2012 05:41 PM      Profile for Manny Knowles   Email Manny Knowles   Send New Private Message       Edit/Delete Post 
Yes, I think David is correct. (It's been over 10 years since I worked with the IIB, so it's taking a while to come back to me also.)

Anyway...

Look on the Output/Music card for a pair of "Music L/R" trimpots -- As I recall, having THOSE set too high is what causes the crosstalk.

Since this is affecting your shows now, why not try this:

With no movie playing...Put your system into "surround" mode (since that's where you get the most crosstalk) and leave the main fader where you normally have it for movie sound.

(Make sure that the music is playing.)

Turn down both L/R Music levels using the trims on the Output/Music card. Try to make equal adjustments to maintain L/R balance. Stop when the crosstalk is gone.

Switch to your Non-Sync format.

Trim the overall music level (up) so that you're back to the desired NS level. (The overall trim is a little pot hiding next to the main fader. It gets hidden when the front cover is in place.)

This should resolve the issue well enough for the time-being. Your tech can fine-tune things later.

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