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Topic: silabance (sp?) in Dolby A playback systems
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Ray Derrick
Master Film Handler
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Posts: 310
From: Sydney, Australia
Registered: Sep 2001
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posted 01-13-2002 01:57 AM
JoshSibilance is not characteristic of A-type NR (if the print is also A-type as you say). Do you have any spare A-Type NR cards? You may have a faulty one. If there is a fault it will usually be only in one channel which will cause the sibilance to constantly shoot across to the left or right speaker. Sit in the middle of the front row and you will easily hear this if it is happening. ------------------ Ray Derrick President/Chief Engineer Panalogic Corporation Sydney, Australia Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935
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Paul G. Thompson
The Weenie Man
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Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 01-13-2002 11:50 PM
I have to agree with Steve Guttag. When I watched the movie "Dazed and Confused" and that other POS you were running, I thought the sound was great! What I have heard in "Scrooged" that you speak of was something I heard being emitted from the HF drivers, but since the other movies sounded great, I just contributed it to the age of the print. It was so minor I didn't even think it was worth mentioning. The only thing I noted was too much of a volume change when the system defaulted to SR "A", plus the dynamic range seemed to suffer a little more than what I was accustomed to hearing in other theaters equipped with reverse scan. I think your system does need slight amount of tweeking. It might be worth the effort to call that to the attention of "TJ" the next time he is in town. Paul
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Ray Derrick
Master Film Handler
![](http://www.film-tech.com/ubbmembers/1001.jpg)
Posts: 310
From: Sydney, Australia
Registered: Sep 2001
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posted 01-14-2002 01:34 AM
Sibilance is normal with human speech, varying in degree from one individual to another. But "sibilance distortion" is caused by distortion of upper mid-frequency sounds, usually around the 6kHz region. It causes a kind if slurring or spattering on "S" and "F" sounds. So Josh, are you talking about sibilance distortion or the sound just being excessively bright?I agree with what others have said regarding EV HF systems. They have a natural (and significant) response peak at around 6kHz which is normally equalised out by the cinema technician. If the driver becomes faulty, this natural peak can turn really nasty, although as Josh says, this would normally show up on all formats. ------------------ Ray Derrick President/Chief Engineer Panalogic Corporation Sydney, Australia Phone: 61 (0)2 9894 6655 Fax: 61 (0)2 9894 6935
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Paul G. Thompson
The Weenie Man
![](http://www.film-tech.com/cgi-bin/paulpics.cgi)
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 01-14-2002 03:13 AM
Correct me if I am wrong, but I think the wider bandwidth the reverse scan can handle, the more it is going to "see" that a standard optical lens cannot. I would think that reverse scan would be very capable of reproducing harmonics to produce the sound Josh discribes.Paul
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