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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » dolby 360 nr

Author Topic: dolby 360 nr Fabio Bozzoli Film Handler Posts: 5 From: Mantova, Italy , Italy Registered: Mar 2006 posted 03-19-2006 03:01 AM                     I have a small cinema. We are using stereo track without noise reduction. i have bought on ebay http://cgi.ebay.ca/Dolby-Model-360-w-SR-Module-Cat-No-280_W0QQitemZ7373167208QQcategoryZ23793QQcmdZViewItem two dolby 360 with 280 nr for mono track but i am not able to find the manual. I have to calibrate them but I know that i should use dolby noise. We have only (because film processors use only it) dolby tone ( tone al 50% of range at 1000Hz) I want to generate dolby noise (pink noise) do you know how it is? I have read that it is 15 dB lover dolby tone. is it true? The you know frequency range. thanks Fabio  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 03-19-2006 03:18 AM                     Fabio, Use Dolby Tone (cat 69T) and adjust input until the needle is in mid position (dolby level). I'm shure you're using also some sort of preamp. The processor comes after that so be careful not to overload its input. Christos  |  IP: Logged Fabio Bozzoli Film Handler Posts: 5 From: Mantova, Italy , Italy Registered: Mar 2006 posted 03-19-2006 07:36 AM                     I have used this procedure but i am not sure about it. The sound seams innatural. Have you tried it? I have read on 363 manual http://www.dolby.com/assets/pdf/tech_library/151_363_8.Manual.pdf that pink noise (used for sr) is 15 dB lower than dolby tone (ad display make an automatic shift of 15 dB) thanks if i use  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 03-19-2006 10:26 AM                     Fabio, can you describe unatural sound? Also your sound set up? ie. what precedes and what follows the NR processor. C.  |  IP: Logged Fabio Bozzoli Film Handler Posts: 5 From: Mantova, Italy , Italy Registered: Mar 2006 posted 03-19-2006 11:35 AM                     ok i have a leser head an preamplifier ( stereo mic amplifier) two dolby 360 with 280 nr an equalizer and finally apmlifier i heard some distotion (with dolby sr) with loud voice (but not with hight music ) and i feel some problem with high frequency .. a lack of them (but not in all scenes) for this a am thinking about problem of level thanks Fabio  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-19-2006 01:02 PM                     Have the 280 been set for playback mode?  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 03-20-2006 03:24 AM                     I was going to ask the same thing Gordon did. As far as I can understand you adjust the house levels from the amp, or you use the preamp you have? By turning NR off does the sound issues disapear?  |  IP: Logged Fabio Bozzoli Film Handler Posts: 5 From: Mantova, Italy , Italy Registered: Mar 2006 posted 03-20-2006 04:20 AM                     the card is set on play (non rec) by 360 unit bottons. On the back of 280 there are tree bridge: 360, M, 361 Do you know how do they work? How can i force 280 to work only in play mode? I adjust level by preamp (for the dolby sr) and after i adjust cinnema's level by amplificator control. if i switch of dolby sr , the sound is great. if i switch off  |  IP: Logged Christos Mitsakis Expert Film Handler Posts: 242 From: Ag.Paraskevi, ATHENS, GREECE Registered: Sep 1999 posted 03-23-2006 07:52 AM                     Cat 280 can fit in diferend dolby mainframes as the 360 and 361. In your case the 360. Although I would not recomend to modify the cards for playback only since you are actually using a NR that has the switching on its main panel here are some links here that adress this issue: http://www.film-tech.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=007344#000000 http://www.film-tech.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=002615 On the distortion issue. By lowering the level on your preamp below dolby level does the distortion on loud voice passages go away? HF loss will be more apparent though.  |  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.