This is topic non-sync to surround speakers only? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Joop de Gruiter (Member # 84) on 04-25-2000, 05:51 AM:
How do I get the non-sync signal from cd or tape to go only to the surround speakers.We have a CP55 with a SRA5 SR processor.
Greatfull for any help.
Posted by Scott Norwood (Member # 30) on 04-25-2000, 07:44 AM:
At least on the CP-50, you can just wire the CD/tape machine to the surround ("S") input on the back of the processor, rather than to the center or L and R channels.
The only potential problem with this is that you have to remember to switch the booth monitor to "center" when starting the film...otherwise, you'll probably have a panic attack ("why am I hearing all this music and no dialogue?!?!") when the film starts...
Posted by Brad Miller (Member # 2) on 04-25-2000, 09:11 AM:
Hook the signal into the surround input of the aux input and switch the automation wiring to pulse aux instead of non-sync.
Posted by Steve Guttag (Member # 268) on 04-25-2000, 05:23 PM:
Or better yet, hook it up to the "MAG" input's "S" input. Leave AUX for possible Digital expansion. With the Mag input, you have the choice of either 1V or 100mV sensitivity. If need be, the input sensitivity header can be modified to achieve other sensitivities.Steve
PS, you are truely lazy and are using a balanced source, invert phase on either line feeding the Non-Sync input and stuff diodes on the INL and INR on the Cat.243...I don't recommend this but it should work.
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"Old projectionists never die, they just changeover!"
Posted by Joop de Gruiter (Member # 84) on 04-27-2000, 02:28 PM:
If I would connect the signal to the Aux input won´t that result in that you can hear both the CD player and the movie (when SR is selected)at the same time? Considering that you press aux to select the SR format.
Posted by Steve Guttag (Member # 268) on 04-27-2000, 03:39 PM:
Wow, you still have the SRA-5 hooked up the "old" way...ie use the Aux input for SR and the SRA-5 inputs for non-sync....at some point, you should fix that...grab yourself a DA-10 or DA-20 manual and reference how to hook up the SRA-5 so that you free up the AUX input and take the otherwise worthless "03" format for SR.But be that as it may, using the "MAG" inputs will do what you want, as I suggested before since most people do not run 35 magnetic much anymore.
Steve
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"Old projectionists never die, they just changeover!"
Posted by Steve Guttag (Member # 268) on 04-28-2000, 07:56 AM:
One note to using the Mag inputs on the CP-55...it does have a quasi-Academy filter on the mag input (1st order filter at 4.5KHz) that is defeatable. I forgot that this was the default setting; my thanks to Brad Hohle for reminding me.The surround capacitors of interest are C116 (15pF) and C115 (390pF). They are connected in series but the 15pF cap is jumped out. Unfortunately, Dolby made the jumper a PCB trace rather than a wire link. To disable the filter either remove C115 or (preferrably to keep a 100KHz filter in place), cut the foil located just to the right of C115 (in fact it is located on the "solder" side of the PCB where the letter "C" is for C115). The foil links to solder pads that do nothing otherwise (ie where the wire link should have been).
Steve
PS, for CP-65 users, though the Cat 242 is used on the CP-65, the capacitor values have been changed to avoid this problem. The filter really was for 35mm 4-track magnetic.
Steve
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"Old projectionists never die, they just changeover!"