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Topic: Elmo GS-1200 audio output to stereo amplifier
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Chip Gelmini
Phenomenal Film Handler
Posts: 1733
From: Brooksville, FL
Registered: Jun 2003
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posted February 10, 2018 10:33 AM
I have been using a GS 1200 machine since 2014 and I will never use anything else. This is a workhorse and a remarkable machine. To buy one on Ebay is easy yet frustrating as it will need repairs. But after all of that, comes joy because it is a true beauty. Take it from one who has been through this several times with no regrets.
I run mine only with the bulb it was designed for. I have no need to change the lamp house method or design. I do not need brighter or longer lasting lamps.
One thing I have done that is different, is to use the external speaker output as a “secondary auxiliary output.” For those of you familiar with the ST 1200 aux out, this works the same way. That is, the volume control is brought up to send the sound to an external receiver.
To do this, you will need two plugs called 2pin-din. A link is provided below as a good source for this plug although you will receive just the plug and will have to open it up and install a cable to it which is easily done.
I have also run both sets of outputs (2 pin din AND aux out) in to a small switch box. The output of the switchbox goes to the receiver. In this method I avoid swapping cables. All I have to do is push a button and projector outputs are easily changed.
The advantage is to fill a 1200 foot reel with two cartoons and three trailers spliced to the head of the first feature movie reel. For example mono shorts on the front of a stereo feature. One button changes the sound.
Another good example: Magnetic shorts on the front of an optical feature. In this projection step you would begin with magnetic sound, then switch to stereo and switch from mag to optical then switch back to mono. The extra step mutes the POP sound when changing between the sound formats.
Many of these tiny switchboxes have multiple inputs that are numbered. So I put the 2 pin din output in switch one; stereo in switch two; and use switch three (silence) for the mute mode.
And by filling the reel, to one hour run time, you maximize efficiency of the projector and lamp life of the bulb.
The volume knob with 2 pin din goes no higher than 2 for magnetic, and no higher than 3 for optical. Theater sound is adjusted with the receiver volume control, not the projector. In this mode, your Elmo GS 1200 is like a theater projector – the sound output is preset by a technician – and the projectionist adjusts the sound at the Dolby unit.
It should also be noted that to avoid an over modulated soundtrack in optical prints, Elmo put a resistor on the optical mode output. It is only natural and very safe to turn it up more than magnetic, so don’t worry about having to do it. Stay within number 2 (the printed scale around the volume knob) for magnetic – and number 3 for optical.
When finally connected – run everything mono through 2 pin din. And everything stereo through aux out. Assuming you have a good sound system for your theater and that it is calibrated properly according to the amplifier’s owner manual, you should be quite impressed with the results.
After reading several posts in this thread, I would use caution when using the headphone outputs on the GS 1200. It should really only be used for the headphones as it has a higher output and can cause feedback or distortion if fed to a secondary receiver then to receiver speaker boxes. On my machines, the headphone output is left empty and is never used.
2 pin plug purchase link:
https://vetco.net/products/2-pin-din-male-inline-plug/ve-ca075?gclid=EAIaIQobChMIz-3lhN-b2QIVDzJpCh1-wggOEAQYASABEgJIZPD_BwE
Happy film presentations
Chip Gelmini
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why are they using that, instead of the aux out. Thinking if the experts can do it I must try it out myself...so I did 
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