Film-Tech Forum ARCHIVE: What's the best way for SR?

This is topic What's the best way for SR? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Jae-Eun Jang (Member # 1412) on 03-06-2004, 05:37 PM:

hi! i'm the one of projectionist in seoul.
we have a sound problem to play old korean film here. Cause people feels that volum is too faint. But actually we play that as volum SR Vol=7.5.
what sholud i check for the first? Let me know the reasons..

P.s we got CP650, DCM3 system.

Posted by Mark Gulbrandsen (Member # 72) on 03-06-2004, 05:48 PM:

Welcome to Film-Tech. Its always nice to see people from foreign countries here.

I would want to know two things first. What type of track do these older films have... mono, if mono what type mono is it. Varialbe density, or variable area. If variable area is it dual bilateral or unilateral and so on. Some types of old mono tracks do not play back properly with a RED LED reverse scanner. If the tracks are stereo are they Type A Dolby Stereo, or SR Dolby Stereo ?
Also does the volume level in the auditorium stay the same when you switch from Dolby Digital to SR Analog? If they do not match very, very closely then you may need to have an A chan alignment done. If you can let us know more details of what type of old track it is that your running then we may be able to offer you more help or suggestions.
Mark

Posted by Joe Redifer (Member # 3) on 03-07-2004, 12:02 AM:

This post be goin' to Film-Handla's forum yo. Word up dawg.[av=m]

Posted by Jae-Eun Jang (Member # 1412) on 03-10-2004, 12:53 AM:

thanks for the your reply, Mark [Smile]

first, it was the 5.1 Dolby Digital film. we play that over 500 times. so, digital was not okay to paly. and we play digital vol=6.5, and vol=7.5 for SR. And sound volum is louder than before(to hear in the theater)after we did Dolby level adjustment in CP650 menu. but, i wonder what the meaning of the four vertical circles when we adjust Dolby level manually.
why is that the two center circle should fill black? cause i heard if two circle is in the bottom, it means high frequency is weak.(someone told)is this right? also i want to know about
how often you do Dolby level calibration?

Posted by Michael Schaffer (Member # 1204) on 03-10-2004, 11:29 AM:

They display simply the signal level. The 2 in the middle represent +1 dB and -1 dB. So, if both light up, you are in the middle of +1/-1=0 dB, you are on the reference level. The reason you have to adjust the level periodically is because your exciter lamps/LEDs dim with time and so the light level drops, and with it the sound level.
The dialog level should be exactly the same in analog and digital, provided the system is aligned properly and the movie is mixed and recorded at the right level. The main difference in loudness between analog and digital is that digital has more headroom. That means that while the dialog should be equally loud, the digital format has more reserve for loud passages.

Posted by Gary Crawford (Member # 2038) on 03-10-2004, 01:00 PM:

This might help. I've noticed in some older prints we had over the years that "normal dialogue level" was anything but. Some movies were simply quieter, or louder than others.

Today I notice that Disney movies in particular seem to be of lower audio (through old-style straight optical excitation) and some British imports as well (although Brits seem to mumble more than American actors do).

And of course make sure exciters and lenses are clean.