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Topic: non-sync to surround speakers only?
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 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. ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 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 ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 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 ------------------
"Old projectionists never die, they just changeover!"
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