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This topic comprises 3 pages: 1 2 3
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Author
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Topic: New noise when reverse scans were installed
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Darryl Spicer
Film God
Posts: 3250
From: Lexington, KY, USA
Registered: Dec 2000
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posted 08-22-2002 10:09 AM
>>Putting in a JAX light in a drive in has no advantage at all over a reverse scan except for the lesser performance you will end up with. The JAX light preamp is inherently noisy itself and may have only added to the grief. Like most good techs will do, I've only installed one or two of them and then it was back to the real thing.<<Mark
Mark,
I agree with you to some extent about the Jax light. We use them in all of our theaters here except for one auditorium. In that one we put a Prototype of a Component Engineering reverse scan reader. Model I can't remember off the top of my head. We had the LED fail on it once and it was not an imidiate fix. After doing all the grounding of the Jax lights we have very good sound and no noticeable sound artifacts. Using the transformers like you would use for a calculator or something, we found to be a lot better than using the existing exciter supply. I felt that for a drive-in you could have gotten good results with the Jax light and propper grounding since the source is going to be either in car speakers or a cars stereo system wich can all vary in quality.
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Tim Sherman
Expert Film Handler
Posts: 125
From: North Ridgeville, OH, USA
Registered: Aug 2000
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posted 08-22-2002 04:49 PM
I got the ground loop taken care of just ended up being wires run to close to one another. I did disconect the compressors and it didn't help any. What i did find out that helped some was turning down the high frequency trimpots on the preamp card of the modIIB did help with the "S" type distortion. There is still pleanty of the high frequeny comming through the system so i will turn down the trimpots just alittle more to see if i can get it to a good level. With the reverse scans the differece with the channel seperation and the dynamics is amazing compared the exciter. How does the crosstalk look on the scope using the jaxlite and how does it look running reverse scan. I know how it looked between the exciter and the reverse scan. ------------------
http://www.autoramadrivein.com come on out to the drive-in and spend a night out with the stars"
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