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Author Topic: 70mm six-track Dolby Stereo on DVD… Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 01-31-2015 06:40 PM                     You're right, it was indeed one of the first "Format 43" films. So they didn't have to remix anything for the later 5.1 releases... bad example I guess creating a movie with an odd mix is always a rather risky business. How many theaters would have been equipped to play tracks with split surrounds back in 1979?  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 01-31-2015 07:06 PM                     The now long gone North Point in San Francisco is one place it opened in format 43. A short distance from Dolby's headquarters at that time. They also had the qunitraphonic (sp) for Tommy there as well. It used DBX noise reduction.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 01-31-2015 08:15 PM                    No risk. Format 43 is backward compatible with Format 42. Those theatres run the full range, mono surround from channel 6 like normal and run the L/E and R/E (no NR needed) through low pass filters to the LF screen channels their normal way. The stereo surround info on those two channels is filtered away. (Remember that 43's surrounds were stereo only mid range and up. Low end for both sides came off channel 6).  |  IP: Logged Jonathan Goeldner Phenomenal Film Handler Posts: 1360 From: Washington, District of Columbia Registered: Jun 2008 posted 01-31-2015 08:16 PM                     the Quintaphonic mix for 'Tommy' is actually retained as a second audio track option on the bluray - it sounds great!  |  IP: Logged Bill Gabel Film God Posts: 3873 From: Technicolor / Postworks NY, USA Registered: Jan 2002 posted 02-03-2015 07:23 PM                     quote: Jonathan Goeldner anyone know if 'Wolfen' had split surrounds, or was it mono? The 70MM prints of "Wolfen" had mono surrounds. I opened this film in 70MM 6-Track Dolby Stereo at Pacific's Picwood Theatre. It was the only 70MM run in Southern California. Still have a 35mm Dolby Stereo print of it here.  |  IP: Logged Ron Funderburg Jedi Master Film Handler Posts: 814 From: Chickasha, Oklahoma, USA Registered: Nov 2007 posted 02-05-2015 12:13 PM                        I seem to remember the opening of Alien having the clicking sound of the bird dropping down walk around the room starting and ending at the center speaker when I saw it at the Cooper in Denver! I might be wrong I often am but I remember it pretty well. It was my first date after my divorce and impressed her by taking her to tour the booth before we saw the movie. I worked for Commonwealth at the time but not at the Cooper. When she heard the sound move around the room she was awed it was her first time to see 70mm or hear surround sound. So I'm not positive it was in split surround but I thought it was. I love that movie!  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 02-05-2015 05:46 PM                       Alien was in Mono surround. Don't recall Aliens though.  |  IP: Logged Bobby Henderson "Ask me about Trajan." Posts: 10973 From: Lawton, OK, USA Registered: Apr 2001 posted 02-05-2015 10:53 PM                     Aliens was Format 42 as well.  |  IP: Logged Thomas Hauerslev Master Film Handler Posts: 451 From: Copenhagen, Denmark Registered: Aug 2000 posted 02-06-2015 02:42 AM                        Here's the list of all Dolby 70mm titles: http://www.in70mm.com/library/process/dolby/index.htm  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 02-06-2015 06:18 PM                        Max Bell of Bell Theatre Services in London, UK was the Dolby consultant and instigator of format 43. In so many ways, it paved the way for 5.1 digital. My memory is that, while other films were tested in 70mm format 43, A.Now was the only actual release. You would have needed an SA-5 adapter to use it, which looked just like a CP-50. The only processor back then would have been a CP-100 (prior to CP-200.) Because of format 43, I wired all Dolby cinemas (even the 35mm ones) with 2 power amps on surrounds and split the wiring. Digital conversions were a 4 hour operation.  |  IP: Logged Jonathan Goeldner Phenomenal Film Handler Posts: 1360 From: Washington, District of Columbia Registered: Jun 2008 posted 02-28-2015 04:12 PM                     so Format 42 was 'baby boom' and Format 43 was 3 front/stereo split surrounds plus bass - right?  |  IP: Logged Martin Brooks Jedi Master Film Handler Posts: 900 From: Forest Hills, NY, USA Registered: May 2002 posted 08-19-2015 12:50 AM                        quote: Jonathan Goeldner so Format 42 was 'baby boom' and Format 43 was 3 front/stereo split surrounds plus bass - right? I know it's an old post, but no one answered you. In 42 Baby Boom, only low frequencies were recorded on tracks 2 and 4 (Le and Re) and surround was mono (track 6). In 43 Split Surround, low frequencies were still recorded on tracks 2 and 4 and sent to Le and Re, but high frequencies were also recorded on those tracks in stereo and sent to the stereo surrounds. Then track 6 would have the bass frequencies for the surrounds in mono, but that didn't matter for the low frequencies. There was a 250 Hz low pass filter for the low frequencies to Le and Re and a 500 Hz high pass filter for the high frequencies to the stereo surrounds and a 500Hz low pass filter for the mono low frequencies from track 6 to the stereo surrounds. There was also a subwoofer option also with a 250Hz low pass filter and an anti-resonance filter with a cut at 100 Hz. Noise reduction and EQ was optional for the stereo surround channels. EQ was also optional for channels 2 and 4 for use with 6-track discrete non-Dolby films where channels 2 and 4 were full range. Also 42 was Dolby A. If the track was Dolby SR, it was format 45. 43 was Dolby A. If the track was Dolby SR, it was format 46. 40 was 6-track 70mm Todd-AO 41 was 6-track discrete with Dolby A (mono surround), 44 with Dolby SR (not that there were any)  |  IP: Logged Michael Coate Phenomenal Film Handler Posts: 1904 From: Los Angeles, California Registered: Feb 2001 posted 08-19-2015 01:46 PM                     quote: Steve Guttag Format 41 applied Dolby NR to a traditional Todd-AO mix...reissues of classic titles often used this format. I think Annie and Rhinestone used this format in post 1977 times. Rhinestone???  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-19-2015 04:36 PM                     The SR versions of 70mm never had official format numbers assigned. The CP200 you worked with may have used those numbers but that can vary. You might even have a Dolby screening room using those particular numbers but there is no official published document for them. Those with Dubbers also had a slew of alternate format numbers too.  |  IP: Logged

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