my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Installing CAT160 OBE in CP50

Author Topic: Installing CAT160 OBE in CP50 Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 02-02-2003 12:41 AM                     I wanted to know how to install a CAT160 subwoofer card in a CP50 with out the adaptor that is necessary to use the CAT85 as a pink noise source. I have another pink noise source but it can only put out a 150mv signal and according to instructions a 600mv pink noise signal is needed. Any help would be appreciated.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-02-2003 10:38 AM                     For tuning the sub (parametric EQ)...any Pink Noise source will do and is injected on one of the test points on the front of the card. As to balancing it out...you could even use pink noise test film to get you in the ball park. If you know of anyone that has Ultra Stereo's TT-1 test film, that would be the one to use since it is pink noise recorded at about 50% modulation so it should be at the cusp of not having any interaction with the NR expander. Steve  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 02-02-2003 11:28 AM                     Thanks for you help.  |  IP: Logged Bas Haldermans Film Handler Posts: 11 From: GA Echt, The Netherlands Registered: Dec 2002 posted 02-02-2003 04:25 PM                        I've installed a cat 160 in a CP50, I was wondering indeed how to equalize the subwoofer. I only have the cat 85 pink noise generator. Bas  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-02-2003 06:50 PM                     I think steve already covered that Dolby makes a little adapter board that allows the 85c to plug into the preamp slot Also connect a pink noise gen. to the Lt and Rt preamp out terminals (unplug the preamp) and raise the level to just above the dot on the NR card  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 02-02-2003 11:04 PM                     For EQing the Subwoofer, wouldn't pink noise test film be pretty much the same as using a pink noise generator? Basically the amps for all other channels would be turned off in order to isolate the subwoofer. Correct?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-02-2003 11:12 PM                     Not exactly...you have to make sure the PN is above 50% modulation on the test film or you will have the effects of the NR's decoding circuitry mixing in. Steve  |  IP: Logged Sam Hunter Jedi Master Film Handler Posts: 779 From: West Monroe, LA, USA Registered: Jan 2002 posted 02-19-2003 07:26 AM                     I have the dolby CAT69C test film. That pink noise level is not high enough to work properly? I dont have the CAT 85 card so could I use any pink noise source? You mentioned removing the preamp card, could you use the preamp card to bring up a low level pink noise source as well? I was planing on using my PC,s sound card and generator program as a source. Any harm in doing this? Thanks.  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.