“Almost like a real web site”

Search | Contact
News | e-News |
Rumour Mill | Stories
Foreign Language
in70mm.com auf Deutsch


Todd-AO Festival
KRRR! 7OMM Seminar
GIFF 70, Gentofte
Oslo 7OMM Festival
Widescreen Weekend

Premiere | Films
People | Equipment
Library | Cinemas
Todd-AO Projector
Distortion Correcting

Ultra Panavision 70
Super Panavision 70

Super Technirama 70
MCS 70 | DEFA 70
Dimension 150
Sovscope 70
ARRI 765 | Blow-up
35mm to 70mm
Blow-Up by title
IMAX | Cinema 180
Showscan | iWERKS
Various 70mm Films
Large Format Engagement
Chronological Order

Cinerama | Film
Archive | Remaster
Cinemiracle | Rama
Cinerama 360
Circle Vision 360
Realife | Grandeur
Natural Vision
Vitascope | Magnifilm
Early Large Format Films


France | Germany
Denmark | England
Australia | USA

6-Track Dolby Stereo
7OMM Projectors
People | Eulogy
65mm/70mm Workshop

• 2025 | 2024 | 2023
2022 | 2021 | 2020
2019 | 2018 | 2017
2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007 | 2006 | 2005
2004 | 2003 | 2002

2005 | 2004 | 2002
2001 | 2000 | 1999
1998 | 1997 | 1996
1995 | 1994 | PDF

in70mm.com Mission:
• To record the history of the large format movies and the 70mm cinemas as remembered by the people who worked with the films. Both during making and during running the films in projection rooms and as the audience, looking at the curved screen.
in70mm.com, a unique internet based magazine, with articles about 70mm cinemas, 70mm people, 70mm films, 70mm sound, 70mm film credits, 70mm history and 70mm technology. Readers and fans of 70mm are always welcome to contribute.

Disclaimer | Updates
Support us
Table of Content

Extracts and longer parts of in70mm.com may be reprinted with the written permission from the editor.
Copyright ę 1800 - 2070. All rights reserved.

Visit biografmuseet.dk about Danish cinemas


Introduction to Sensurround

The 70mm Newsletter
Written by: From the Sensurround manual Date: March 18, 2004
The Sensurround Model II system developed by MCA Universal brings a new dimension to the motion picture theatre. It is designed to generate special audible and sub audible effects not yet possible to reproduce on presently available systems. The audience will actually be participating in the film. The torso will vibrate. So will the diaphragm. Flesh and auditory nerves will receive the sensations one might feel while experiencing the event depicted on the screen. Rather than the structure-shaking resulting from a natural disaster, this vibrating movement is actually airborne. Although some vibration can be felt - on thin wall surfaces, the amplitude is so small that no appreciable displacement can be measured. Also, the Sensurround effects will not cause hearing damage. The system is composed of high-level electro-acoustic with solid-state power amplifiers capable of up to 1000 watts of audio power. The system develops 100 to 120 dB sound pressure level (SPL) on the "C" scale in the theatre.

The amplifiers that power the electro-acoustic transducers are provided with programmed signals from a specially recorded sound track that contains frequencies below audible range as well as within the lower audible frequency range. The Sensurround electro-acoustic transducers reproduce very low frequency components intentionally recorded on the sound track. These frequencies are too low to reproduce efficiently on theatre speaker systems. Sensurround transducers in the front and rear of the theatre are energized with the low frequencies of the sound track when commanded by special control tones recorded on the sound track.

Further in 70mm reading:

Sensurround Horror Stories

About Sensurround

Sensurround @ the Schauburg

Internet link:

Using This Manual

This manual has been written to make your job easier by providing you with step-by-step instructions for installation, servicing and removal of equipment. It also gives you guidance on the job you are to do and the support you will receive from others participating in the program. So you'll have an overview of your job, we suggest you read it cover to cover before beginning to install Sensurround. Then, as you begin the job, read the manual line by line and follow the instructions. You may even wish to physically check off each duty performed. By following this manual, you should be able to get your Sensurround system installed with a minimum of effort.

In order to create the low frequency Sensurround effect theatres, the Sensurround Model II system incorporates he following features: 

A. Low frequency effects are recorded directly on the optical track eliminating need for an effects generator in each theatre.
B. Sound track is DBX encoded to give wider frequency response and dynamic range.
C. Large horns which are very efficient at low frequencies are placed in the theatre. These are driven by amplifiers and special control electronics provided with the system.
D. Front and rear Sensurround horns are separately energized for more variation of effect.

In order to insure adequate low frequency performance of projector sound systems, Sensurround Model II control electronic contains two preamplifiers designed to operate rom Solar-cell-equipped sound heads. Semiconductor sound pickups (ANAPFET, Photoverter, etc.) may be adapted by allowing modification instructions furnished later in his book. Theatres having older vacuum photocells will be supplied solar cell conversion kits with the Sensurround equipment. The solar cell kits are designed to permanently replace the older cells, and may be left in theatres after the Sensurround equipment is removed.

Pictures released in Sensurround Model II will have sound tracks encoded Using DBX Curve 2 equipment. This is a noise-reduction system which by lowering the effect of optical sound track noise permits a much wider dynamic range to be reproduced. The increased range is used to enhance low frequency effects specially recorded on the sound track to yield powerful Sensurround sensations in the theatre. The noise-reduction property of the DBX system also permits removal of the "Academy Roll Off" Curve which has been imposed on all optical release prints for the past forty years, and better quality sound will be available in Sensurround Model II pictures. Another refinement incorporated in the Sensurround Model II system is independent control over signals routed to front and rear sets of Sensurround horns. This is obtained through 25 and 35 Hz control tones dubbed into the sound track at low level. Much of the time, the front Sensurround horns are activated to give low frequency support to the theatre speakers behind the screen. The front set of Sensurround horns should be as close to the center of the screen as possible.
Go: back - top - back issues - news index
Updated 07-01-23