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

» Film-Tech Forum ARCHIVE   » Operations   » Digital Cinema Forum   » 5.1 Surrounds in 7.1 Set-up

Author Topic: 5.1 Surrounds in 7.1 Set-up Robert John Jeromson Master Film Handler Posts: 264 From: Auckland, New Zealand Registered: Jul 2004 posted 07-20-2019 02:45 PM                     We have an new install configured for 7.1 set-up using a Dolby CP750. We noticed last week that in 5.1 there didn't appear to be any surround effects coming from the rear speakers. I understand that in 7.1 the rear channels split out as separate channels but in 5.1 should we be getting left/right surround audio from the rear speaker? I hope this makes sense.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 07-20-2019 02:52 PM                     Hi Robert, On the 750 you need to manually enable 5.1 or 7.1 depending on the content you are playing. This can be done from the front panel. You can also automate this via server cue, either via GPI or via ethernet cue. If you keep your sound processor in 7.1 all the time, you will experience what you reported when playing 5.1. I hope this helps.  |  IP: Logged Robert John Jeromson Master Film Handler Posts: 264 From: Auckland, New Zealand Registered: Jul 2004 posted 07-20-2019 03:12 PM                     Thanks Marco, so just so I understand if we set the processor for 5.1 all the time and the use a server cue to switch to 7.1 when necessary we will get surround information from the rear channels for 5.1 films?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 07-20-2019 03:31 PM                     It isn't a matter of "leaving the processor" in a format. If you are cuing the CP750 from the server, you have to cue it to EVERY format. That is, if you switch it to 7.1 mode from the server, it will remain there indefinitely until you cue it back to 5.1 (or some other decode mode). Note, the CP750 doesn't care whether you manually change it via the front panel or via an Ethernet (or RS232) command...they are all equivalent. cp750.sys.pcm_2_channel_decode_mode_1 lr_discrete Is 5.1 mode. cp750.sys.pcm_2_channel_decode_mode_1 4_discrete_sur Is 7.1 mode.  |  IP: Logged Robert John Jeromson Master Film Handler Posts: 264 From: Auckland, New Zealand Registered: Jul 2004 posted 07-20-2019 03:36 PM                     Thanks Steve, that makes complete sense, appreciate your help!  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 07-20-2019 03:54 PM                     What Steve said! Just out of curiosity: didn’t your installer explain you this critical step? Just curious as I have seen many sites running everything in 7.1. (As back in the days I’ve seen sites running everything in EX, but at least with that you wouldn’t miss a channel!)  |  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.