An LFE (Low Frequency Effects) channel is a special audio channel generally routed to a subwoofer and designed to carry the low end for effects sound — the bottom end crunch in a car crash, boom in an explosion, and so on. As such, it supports a pretty limited frequency range, generally from around 25Hz to 80Hz or 120Hz — the range of sound that you feel more than hear. If you are creating sound effects for film or video games, sending bottom end of your sound effects to the LFE channel is a good idea. It will help you get the most impact out of your effects without muddying up your front, center, and surround channels.

If you’re mixing music, generally the bottom end will be routed through a bass management system (often built into a subwoofer or monitor controller) into the subwoofer where necessary. You might send some tympani, bass, bass synth, or kick drum into an LFE channel for more bottom end thump and boom, but in most cases you’ll want to limit the amount of musical material you actively route into a dedicated LFE channel. If the subwoofer your system is calibrated and placed properly, the bass management circuitry will handle routing low end to the subwoofer as needed for you.

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When should I use the LFE Channel in Surround Mixing?

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