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This topic comprises 2 pages: 1 2
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Author
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Topic: EQ'ing a CP50
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
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Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 11-12-2002 07:10 PM
Unfortunately, however you are basically screwed unless you have the extender cable adaptor, otherwise an EQ job will take many many many hours of unplugging the Cat 64, making a tweek, plugging the 64 back in, looking at the RTA, unplugging the 64, making another tweek, plugging the 64 back in, etc etc etc...Bringing the pink noise thru the projector input would not be recommended as it has to pass thru the NR and signal processing stages, and will be impossible to isolate individual channels as you can with the cat. 85C. See if you can locate a technician's services to get the EQ done properly. It will likely cost less than the components you require to do it yourself. -Aaron
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Steve Kraus
Film God
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Posts: 4094
From: Chicago, IL, USA
Registered: May 2000
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posted 11-13-2002 01:35 AM
It's not that difficult to inject a signal into the middle of the CP50. Do you have a Cat.160 subwoofer card or is that slot filled with a blank (except for some traces) card called a 110L? (That's even assuming you have a Cat.150 2:4 channel decoder and not the old 110 & 116.) If you are set up with no subwoofer card and the link card, the link card jumpers Left-Total and Right-Total across that gap. BUT, to use the Cat.85C pink noise generator you'd plug it into the 110 slot and the link card then gets reversed (note the edge connectors on both ends) and plugged in in place of the Cat.150 to jumper L,C,R,S across the gap where the 150 decoder was. So for starters, you might consider tack soldering a connection right on the "150" end of the 110L link card: L is on the contact 10 - contact 4 connection, C is 8/5, R is 7/6 and S is 2/1. Inject your signal there. An alternative is to tack onto 1,4, 5 and 6 of the 150 connector on the backplane. As for extenders, you can live without it although it's awkward. You ought to be able to reach into the CP to adjust the pots "live" on the R and possibly on C with the card in place and the neighbors to the left out, depending on the size of your hand. In fact, with the 150 and 110L out (hooking onto the backplane) you can probably adjust L as well. I think the meter card can come out for this but the Cat.22's must remain in because Dolby availed itself of a line drive amp found on each Cat.22 card (those cards are also used in recording studio gear) and thus the Cat.117 fader/output card contains line drive amps only for C and S while L and R get sent back to the Cat.22's on board amps and then to the output terminals.
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Geof Abruzzi
Film Handler
Posts: 14
From: Mesilla, NM, USA
Registered: Jun 2002
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posted 11-14-2002 09:13 AM
Thanks, this is is the information I need. It looks like I can tap into the backplane from the back of the unit since all the pins for mounting the connector are visible from there. I was also wondering what level the signal should be at?On a related not, does anyone know a tech in southern New Mexico, or El Paso? thanks. Geof
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