The ‘LFE’ or Low-Frequency Emitter is a speaker often used in surround sound systems that accentuate the bass frequencies in a mix. It can be used for sub bass throws that help beef up music, stingers, or big impact sound effects.

In a 5.1, 7.1 or 20.2 system, the decimal number refers to how many LFEs there are in the system. LFE is also commonly labeled on software output routings and tracks that specifically are meant to be sent to the subwoofer/LFE.

Because it emits such low frequencies (and naturally, low-frequencies have long wavelengths that bends around objects), it can be placed almost anywhere in the room. It is usually placed behind or to the side of the listening position.

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