The 70Mm Newsletter Issue 69
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The International Newsletter About 70mm Film THE 70MM NEWSLETTER iiinnn777000mmmmmm...cccooommm Widescreen Weekend 2004 Issue 69, March 21 - 22, 2004, Vol 13 caused loud chirps, squeaks, and buzz which were Highlights of Issue 69 unacceptable. BGW and Cerwin-Vega amplifiers Design efforts began with the establishment of a were found to operate well without these problems. Page 1 Introduction To Sensurround design objective around 15 HZ. Many speakers were By limiting the bandwidth of the amplifier it could be Page 2 “Treasure Seekers” destroyed while trying to attain the necessary sound manufactured at a lower cost, but Universal wanted Page 3 Super Technirama 70 pressure levels. Because of this, it was decided that a full range general purpose high powered amplifier Page 4 Back Issues, Be a contributor the horn design had to be efficient at these low in the event the Sensurround were to be extended in frequencies. Designing a horn to operate with a the future applications. cutoff frequency of 15 HZ - Widescreen Weekend theoretically requires the horn mouth to be about 300 square Program feet in area. It also requires a slow taper rate thereby March 21 meaning the horn would have 10:00 Cineramacana with Audience on Stage to be very long. Folding a picture and Academy of the Widescreen horn to reduce its length Weekend usually results in degrading 13:00 "Hamlet" in Panavision Super 70mm the frequency response, but 17:00 Alex Thompson on stage only at frequencies well 18:00 Dion Hanson, Perspecta Sound above the cutoff frequency. 18:30 "Forbidden Planet" in CinemaScope Since the normal theatre 20:30 "Earthquake" in 70mm and Sensurround on sound system was to handle the curve the higher frequencies anyway, it was considered March 22 practical to fold the 10:30 "55 Days at Peking" in French in Super Sensurround horns. Technirama 70 on the curve At the time the Sensurround activity began, only a very few amplifiers were available that could deliver more than 300 watts. As a result, Universal used those Introduction To manufacturers equipment that could produce this power. Operating the drivers near resonance makes "Earthquake" was released in the three standard Sensurround them highly reactive and effectively increases the theatre film formats; 6 track magnetic sound on The Sensurround effects system was loading on the driving amplifiers. Highly reactive 70mm film, 4 track magnetic sound on 35mm film, created to produce the auditorium shaking currents are therefore driven back into the amplifier, and the old standard single track optical sound on sensations which were used in the movie production which falsely tripped output protection circuits and 35mm film. A system was devised to interface the "Earthquake". Sensurround I effects to all of these formats. In In this Sensurround I system, low frequency reality the term "Standard" theatre sound equipment sound was used to simulate earthquake rumbles and hardly has any meaning today. Some theatres have vibrations, and was to be of such intensity that it old sub par systems, while others have been could be physically felt in the body as well as heard. updated partially and are hybrids; still others have To accomplish this task, a special sound system had new systems. This fact made it difficult to design a to be conceived that could be used to augment a system that can be quickly and simply installed theatre's normal sound system. This special system anywhere and work. W. O. Watson, retired former had to be relatively portable and somewhat tailored sound director for Universal, returned to work on the to each theatre that would use it. Early in the project Sensurround project to assist R. J. Stumpf, the it was realized that none of the existing standard film present director. Watson called on the experience of recording techniques could effectively record and many former colleagues to install Sensurround in reproduce frequencies below 40 HZ, the frequencies theatres in Europe, The Orient, Australia, South that could be physically felt in the body, so it was Americ, South Africa, etc. The Sensurround I system decided that each installation would be equipped was not simple, yet it had to be easily installed and with a low frequency noise generator. Low frequency easily operated. The final Sensurround I system control tones recorded on a special audio track were configuration consisted of the horns required for a to regulate the timing and intensity of the low given theatre, the amplifiers to drive them, and a frequency rumble from the noise generator. special control box which is integrated into the theatre sound system between the projector Issue 69. March 21-22, 2004. Vol. 13. Page 1. The International Newsletter About 70mm Film changeover switch and the audio power amplifier. When The Branmar Theater in Wilmington, UA Fox Theatre in Hackensack, NJ. The The Sensurround Model II system DE, which had shown all the Sensurround films theatre was an old 1800 seat Egyption Art Deco with developed by MCA Universal brings a new closed in the late 80's, you could still see the cracks an awesome balcony. Sensurround presentations dimension to the motion picture theatre. It is in the ceiling from the process! ended when part of the plaster ceiling came crashing designed to generate special audible and sub In Billings, Mont. they opened down during a showing of “Rollercoaster”. Nobody audible effects not yet possible to reproduce on “Earthquake”. A knickknack/china shop occupied was hurt, but the fact that 10 seats got crushed presently available systems. The audience will one of the storefronts. Needless to say, the morning spooked the management. actually be participating in the film. The torso will after the opening all the wall-mounted breakables At the Penn Centre in St Catherines vibrate. So will the diaphragm. Flesh and auditory were in pieces on the floor. For the rest of the run, Ontario the effect was so powerful the booth floor nerves will receive the sensations separated from its slab and sank one might feel while experiencing 2 inches the event depicted on the screen. At the Elaine theatre the Rather than the structure-shaking shockwaves killed all the goldfish resulting from a natural disaster, in the pet shop at the other end of this vibrating movement is actually the mall. One of the most airborne. Although some vibration interesting aspects of the can be felt - on thin wall surfaces, Sensurround "experience" was the amplitude is so small that no watching the crowd reaction. I appreciable displacement can be saw a couple people get up and measured. Also, the Sensurround run out of the theater in fear! effects will not cause hearing Really! The down side was going damage. The system is composed to a movie in a auditorium next of high level electro-acoustic with door. solid state power amplifiers capable of up to 1000 watts of Full story on www.in70mm.com audio power. The system develops 100 to 120 dB sound pressure level (SPL) on the "C" scale in the Sensurround theatre. Films In order to create the low • “Earthquake" frequency Sensurround effect • “Rollercoaster” theatres, the Sensurround Model II system incorporates the following • “Battle of Midway” features: • “Battlestar Galactica” • “Zoot Suit” A. Low frequency effects are recorded directly on the optical The book “Wide Screen Movies” track eliminating need for an (notoriously incorrect) also lists effects generator in each “King Kong” in Sensurround theatre. outside USA. B. Sound track is DBX encoded to give wider frequency "Treasure response and dynamic range. C. Large horns, which are very Seekers" efficient at low frequencies, Making a short film in 70mm are placed in the theatre. By: Michael Donahue These are driven by amplifiers ([email protected]) and special control electronics provided with the system. I have a new feature D. Front and rear Sensurround titled "Treasure Seekers" that horns are separately I'm working on. Its a very low energized for more variation of budget independent feature, a effect. screwball comedy, a love story about greed and lust. It’s set in a small California beach Early Warnings community. I have enough funds ”Earthquake”: Attention! together to shoot "Treasure Earthquake is presented in the Seekers" in 35mm as a SAG startling new dimension of Experimental film, but I am Sensurround. You will FEEL, as looking for a way to get some well as see and hear realistic notoriety for the show. I think effects such as might be shooting in a large format would experienced during an actual earthquake. The that store had to take down all of their wall displays get some attention, and the story, costumes and management assumes no responsibility for the every night and put'em back up the next day! settings, as well as the style of the production would individual reaction of the viewer." I received an e-mail last night from a lend itself very well to 70mm. “Battle of Midway”: (a more polite) Your Attention gentleman in England who's wife got a nose bleed I toured CFI/Technicolor yesterday [mid- Please! Midway is presented in the startling new watching "Earthquake" in Sensurround! Jan, 2004, ed] with Robert Dennis and Bryan T. dimension of Sensurround. Please be aware that Ceiling tiles would vibrate loose and fall on Recla. They toured me through the negative you will feel, as well as see and hear, realistic effects the audience, giving the true earthquake effect. On developing, where they have a 50 fpm dedicated that might be experienced in actual combat. The "Battle of Midway", I walked inside on one of the 65mm developer, which has special high turbidity in management assumes no responsibility....