Going back as far as 20 years, for the Dolby Stereo optical system for 35mm prints, installations which incorporated subwoofer hardware could elect to perform bass redirection (the grandfather of bass management). To this day, cinemas equipped for 70mm playback are the minority. When all three front ‘faucets’ are open wide, the only way to get more water flowing is to add a fourth water supply (the LFE channel) with its own pipe and faucet. Think of the speakers as water faucets, each with its own pipe and water source, but working together to fill a bucket.
In short, it was an economical and practical way of achieving extra bass impact in the existing commercial theater system. And no additional crossovers were needed in the signal path.Did not requiring replacement of the front three channel’s hardware (with more powerful amps and deeper reaching speakers).A discrete channel would not tax the headroom of the existing screen channels with extra information.By putting additional bass information for a subwoofer on a separate track, deeper and louder bass could be delivered within the confines of existing hardware installations: Dolby gave the two unused tracks a new role, affectionately known in its day as the “boom track”. It was noted that often, sound engineers were only using three of the five screen channels. Although an excellent system for it’s day, it did have headroom limitation and conventional screen speakers were hard pressed to voice useful information below 40 Hz. The large 70mm prints could accommodate 6 channels of magnetic sound: 5 screen channels and 1 surround.
Tron legacy soundtrack 5.1 movie#
Back in the days of 70mm movie prints, an LFE type channel was conceived as a method of achieving higher bass output from an existing magnetic sound system. The concept of the LFE channel was conceived a long time ago (even before Dolby Surround Sound). What is the real purpose of this discrete beast? How do we best use it? To understand these and other questions, we must go back to its. I noticed a little confusion over the 0.1 LFE channel of Dolby Digital cinema sound systems and thought it would be a good idea to write an article that, hopefully, explains the situation. While in the commercial system it is referred to as the subwoofer channel, this is not necessarily true for home theater setups. In 5.1 digital surround sound, the 0.1 channel is called the LFE or Low Frequency Effects channel.
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