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The LFE channel carries additional bass information to supplement the bass information in the main channels. The difference between the LFE channel and the subwoofer output is that the LFE channel is used to carry additional bass information in the Dolby Digital program while the subwoofer output represents how some or all of the bass information will be reproduced. The opposite is also true: it is possible for a program to not contain an LFE channel, yet a decoder may provide a subwoofer output because some or all of the main speakers are unable to reproduce the bass information in the program. It is possible for a program to contain an LFE channel, but a decoder may provide no subwoofer output because all of the bass information in the program, including the LFE channel, can be reproduced by the main speakers. Consumer Dolby Digital products that reproduce multichannel sound must combine the LFE channel in the proper acoustic mixing ratio with the bass from the other channels for proper reproduction.Дolby Digital programs may include a bass-only LFE channel, but this channel does not correspond directly to a subwoofer output. When movies formatted for the consumer use Dolby Digital, the same tracks as originally produced are usually used, including the LFE track if available.

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To maintain full compatibility with existing theatres, the Dolby Digital film format includes a separate LFE channel.

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Taking advantage of the available channel capacity on 70 mm prints to deliver a separate bass effects signal proved to be the most direct, convenient, and economical way to supplement the low- frequency capability of movie soundtracks. Finally, no additional frequency crossovers would need to be retrofitted into existing cinema processors to redirect the bass from the main left, center, and right channels to the subwoofer(s). It also meant that the headroom of the 70 mm magnetic audio recordings would not be taxed at low frequencies, which would have detracted from their loudness capability at mid and high frequencies.

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This allowed deep bass effects to be added to movie soundtracks without having to upgrade the existing speakers and amplifiers in the three main screen channels. The LFE channel was originally devised for 70 mm movie productions to deliver a separate bass signal to one or more additional subwoofers placed behind the movie screen. Its purpose is to supplement the overall bass content of the program or to ease the burden on the other channels. In contrast to the main channels, the LFE channel delivers bass-only information (<120 Hz) and has no direct effect on the perceived directionality of the reproduced soundtrack.

5.1-channel audio consists of five discrete, full range main channels (Left, Center, Right, Left Surround, and Right Surround) plus an optional band-limited Low- Frequency Effects (LFE) channel.