Low-Frequency Effects (LFE) Channel



LFE.gif

The low-frequency effects channel (LFE) in a home theater system is more commonly known as a subwoofer. It is a speaker specifically designed to play only the lowest frequencies of audio, from about 120 Hertz on down.

Movie mixing engineers now mix specifically to send the deepest and most demanding bass to the LFE, instead of assuming that your larger front speakers can powerfully reproduce ultra-deep bass. All surround sound systems for home theaters need an LFE.

The most common placement for a subwoofer is in a corner, where it will be louder than if you place it elsewhere in a room. This isn't, however, the most accurate place for it. For that you will need to do the "subwoofer crawl." This involved placing the subwoofer at the location of your head when you're listening to music/movies (no joke) and crawling along the walls listening for where the bass sounds best.

There are three main kinds of subwoofers, active, passive, and in-wall. Check out HTR's subwoofer reviews.

All receivers and AV preamps have LFE outputs.  Visit our AV Receiver Review section and our AV Preamplifier Review section for more information.


Newest

Sep 25
Room Correction Revisited Dennis Burger revisits the topic of room correction, expanding on some of the original explanations from his 2013 primer and providing an updated look at the major room correction systems in use today.
Room Correction Revisited

Sep 25
Audio Research LS28 Stereo Preamplifier Reviewed Ben Shyman auditions the LS28 line-stage preamplifier from Audio Research Corporation's Foundation Series. This $7,500 preamp utilizes four 6H30 tubes in its analog circuit and features balanced and unbalanced connections.
Audio Research LS28 Stereo Preamplifier Reviewed

Sep 23
HARMAN Announces New Mark Levinson № 585.5 Integrated Amplifier This fall, HARMAN will add the new № 585.5 integrated amplifier to the Mark Levinson line. An upgrade to the...
HARMAN Announces New Mark Levinson № 585.5 Integrated Amplifier

Sep 22
Bowers & Wilkins Introduces 700 Series Speaker Line Bowers & Wilkins has introduced a new speaker line, the 700 Series, that incorporates technologies from the flagship 800 Series...
Bowers & Wilkins Introduces 700 Series Speaker Line

Sep 21
Screen Innovations Launches Solo Wireless Motorized Projection Screen Screen Innovations has launched a new line of wireless motorized projection screens: the Solo and Solo Pro. These motorized Zero...
Screen Innovations Launches Solo Wireless Motorized Projection Screen