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Topic: LFE

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Dolby

	DVD Talk Forum - What is the simple definition of LFE?
		LFE stands for Low Frequency Encoding which is when a Dolby Digital or DTS 5.1 soundtrack encodes the bass or lower frequencies to their own channel.
		The LFE channel is intended to be reproduced by a subwoofer, which is a transducer that reproduces frequencies lower than those normally reproduced by a woofer.
		The most important distinction in understanding the LFE is that the LFE in a digital surround soundtrack is distinct from the bass information contained in the other, full-range channels.
	www.dvdtalk.com /forum/printthread.php?t=405325 (505 words)

	LFE Capital: Female focused venture capital (Site not responding. Last check: 2007-10-21)
		LFE Capital is a boutique private equity investment firm with a knowledge base and network that are unique in its industry.
		LFE Capital provides flexible financing solutions for smaller middle-market companies with strong growth and valuation prospects.
		A relationship with LFE brings expansion and buy-out capital and an operations-oriented investor who will dedicate the time and resources required to build a successful business.
	www.lfecapital.com (120 words)

	ButtKicker LFE Reviews. Separate Speakers Reviews by CNET.
		The ButtKicker LFE is basically a cylinder with a 5.5-inch diameter, as tall as it is round, with two flat mounting skids.
		The ButtKicker LFE is a power-hungry device, requiring between 400 and 1,500 watts of power (at 4 ohms).
		At $299 (list price), the ButtKicker LFE costs far less than Crowson's TES 100 sofa kit ($649), but the Crowson kit is easier to install and can be driven by a cheaper, lower-power amp.
	reviews.cnet.com /ButtKicker_LFE/4505-7869_7-30854056-2.html (797 words)

	3DsoundSurge: The Advantage of the LFE and Center channels - Page 3 (Site not responding. Last check: 2007-10-21)
		To take advantage of the LFE channel you either need a 4 or 5.1 system with a separate LFE input or, less ideally, a decoder that down-mix the LFE channel, that is send it to the two front channels.
		With other decoders the LFE track is not having major impact either but at times I find the bass effects to be deeper and sometimes also more powerful when taking advantage of the LFE channel.
		There is however no case where hearing the LFE channel is required to hear an explosition, that is in all cases the sound effects are also using the other channels.
	www.3dsoundsurge.com /features/articles/CenterandLFE/CenterandLFE-p3.html (736 words)

	Height/LFE
		Another problem of using the LFE track as a height channel is that, in most cases, it will simply be ignored and routed to the system’s subwoofer by default.
		During post-production editing of the surround recording, I’ll create the LFE subwoofer channel mix, pulling in the low-end from the main and surround channels as needed and applying a low-pass filter of 160 Hz at 12 dB/octave.
		The full bandwidth LFE channel preamplifier output (NOT the speaker output!) is split with a "Y" and sent to both the subwoofer crossover and to a single-channel high-pass filter for the height speaker amplifier.
	www.wired4music.com /Height_LFE.htm (3208 words)

	BUTTKICKER HOME THEATER LFE (Site not responding. Last check: 2007-10-21)
		LFE features extended low frequency response for powerful bass response and special effects.
		The ButtKicker LFE (low frequency effects) utilizes a patented magnetic suspension which is different from any other speaker or shaker and can be used couches, theater seating, platforms, and any type of structure.
		One ButtKicker LFE will easily replace 2 - 4 or more of the other types of shakers previously available, and perhaps more importantly; it is virtually indestructible and maintenance free.
	www.thebuttkicker.com /hometheater_shaker.html (258 words)

	LFE - Wikipedia, the free encyclopedia
		LFE is an abbreviation that is commonly used in describing an audio track contained within a 5.1 motion picture sound mix.
		The signal from this track, ranging from 10Hz to 120Hz, is normally sent to a subwoofer.
		Dolby - What is the LFE channel (pdf)
	en.wikipedia.org /wiki/LFE (71 words)

	Genelec: How does the 'LFE' input on the 7050B, 7060A, 7070A, 7071A and 7073A work? (Site not responding. Last check: 2007-10-21)
		LFE input is full range (85Hz bandwidth with redirection) This means that ALL information present on the LFE channel will be reproduced through the monitoring system.
		Dolby and others recommend that, for DVD mixes for the home, the LFE channel is monitored and recorded onto tape with an 80Hz low pass filter inserted in the console output buss.
		Note 1: The DTS LFE channel is band limited to either 80Hz or 120Hz depending on the decoder setting, the Dolby Digital LFE channel is band limited to 120Hz but is sometimes recorded with an 80Hz LP filter in-line and other formats have a variety of other different bandwidths.
	www.genelec.com /support/faq/faq35.php (772 words)

	LFE Capital: Female focused venture capital (Site not responding. Last check: 2007-10-21)
		LFE Capital was founded in 1999 by Leslie Frécon, former Senior Vice President, corporate finance of General Mills.
		Ron Leaf is Chief Investment Officer and a principal of LFE Capital with broad responsibilities ranging from deal origination to portfolio company oversight and execution of exit strategies.
		LFE Capital and Castle Harlan formed a strategic alliance to leverage each firm’s respective networks and resources.
	www.lfecapital.com /content/Our_People (677 words)

	Why doesn't the Xover affect the LFE ? - AVS Forum
		Because with a typical BM scheme, all the redirected small speaker signals are mixed together with the LFE information, then the MIXED subwoofer signal is low pass filtered as a single signal.
		LFE as recorded typically starts to roll off below 120hz in most cases, so a typical 80hz subwoofer setting does not filter much LFE signal.
		To answer one of your questions Anthony, the filtered portion of the LFE is NOT added back to the LFE because we're talking about what the bass management process is. Further, since we're low pass filtering the LFE, it doesn't make sense to add back the discarded portion of the LFE.
	www.avsforum.com /avs-vb/showthread.php?goto=newpost&t=511431 (1804 words)

	LFE Detailed Report
		The results of the analysis of each component has been grouped together with other components of the same type and presented in a detailed format that gives the component identification, input values, quantity, failure rate, sum failure rate, and the equation factors used for each part type.
		When the LFE Analysis is completed a special failure rate calculation is made for five additional temperature levels.
		The LFE Detailed Report will present the 10 temperature values along with the 5 FPM values for each temperature level.
	www.relplus.com /lfe__detailed_report.htm (168 words)

	Product Configurator, Proposal & Quote Software - Editions
		The LFE On-Demand Edition is the best way for small teams or new businesses to most efficiently manage their front-end processes.
		The LFE Professional Edition's web-based platform and affordable pricing structure, provides mid-sized enterprises and smaller divisions of larger companies with an automated, deeply functional solution enabling them to compete with larger players in their marketplace.
		The LFE Enterprise Edition is a full-featured enterprise class platform delivered with the boundless flexibility that large enterprises require.
	www.bigmachines.com /products/lfe_editions.htm (333 words)

	Home Theater Forum - Repost: Test Tones For Evaluating Your LFE Pad (Site not responding. Last check: 2007-10-21)
		Because the LFE track in a dolby playback system (if configred correctly) boosts the LFE by 10db- a correct playback should keep the tone even until it reaches the LFE, where it will jump by several DB (approx 10).
		The exact same wav file was imported for each of the main channels- so it is absolutely identical (aside from the LFE tone which is 10db down- but all tones were generated using professional tone generation software).
		He thinks both redirected and LFE bass are sent to the Large mains (even when sub=yes) and uses the Dolby diagram (config 2 on Dolby website) to support his claim.
	www.hometheaterforum.com /htforum/showthread.php?s=&threadid=220609 (1411 words)

	MIT Laboratory for Financial Engineering (Site not responding. Last check: 2007-10-21)
		The principal focus of the LFE is the quantitative analysis of financial markets using mathematical, statistical, and computational models.
		The goal of LFE is not only to spur advances in financial engineering, but also to develop better ways to teach students and executives how to apply financial technology in corporate settings.
		The sponsored activities of the LFE include financial support for basic research in financial engineering, the purchase and maintenance of computing hardware, software, and financial databases for academic study and teaching applications, dissemination of research findings in the form of technical reports and preprints, and occasional seminars and conferences on selected research topics.
	lfe.mit.edu /about/intro.htm (349 words)

	LFE Analysis
		The LFE Analysis is used to evaluate the potential reliability of a component or group of components such as an assembly.
		The LFE Analysis is controlled from the LFE Interface Form which is selected from the Main Menu of the
		The LFE Interface Form is made up of a control panel of 18 Buttons and 5 display pages with tabs to select them.
	www.relplus.com /lfe_analysis.htm (216 words)

	MEDIATWINS : Technical support : AC3 Audio Format (Site not responding. Last check: 2007-10-21)
		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.
		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.
		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.
	www.mediatwins.com /FAQ/ac3_format.htm (340 words)

	TECH NOTE: The LFE Channel - BDCABLE (Site not responding. Last check: 2007-10-21)
		Since there is more than just a little confusion over the 0.1 LFE channel of Dolby Digital cinema sound systems, we present this primer on it which, hopefully, explains the beast.
		The concept of the LFE channel was conceived a long time ago (even before Dolby Surround Sound).
		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.
	www.bdcable.com /blog/2003/03/10.htm (726 words)

	About LFE (Site not responding. Last check: 2007-10-21)
		LFE went on annual tours from 1996 to 2002 to high schools (for Roanoke College Recruitment) in NC, VA, MD, and NY.
		In the fall of 2002, LFE became a separate entity from the Roanoke College Choir, opening membership to all male singers on campus.
		It is made possible not only by LFE, but by Rev. Paul Henrickson, the Chaplain's Office, and all the other hard workers from Habitat who not only contribute time and money putting it together, but who work diligently throughout the performance.
	www.roanoke.edu /stuaff/organizations/echo/aboutlfe.htm (493 words)

	Feature Article (Site not responding. Last check: 2007-10-21)
		Despite the stigma that in the cinema the LFE channel is 'the subwoofer' channel, most home subwoofer(s) will be asked to voice bass from both the main channels and the LFE track.
		Processors that let you manipulate the LFE level independent of the subwoofer level are few, and most of these only let you reduce the offset to protect a less capable subwoofer from undue stress.
		One reason not to send a subwoofer the LFE channel alone is that there may not be anything on it or there may not be an LFE track at all.
	www.sdinfo.com /volume_7_2/feature-article-misunderstood-lfe-channel-april-2000.html (3001 words)

	Genelec: In a Dolby Digital 5.1 system should subwoofer level be aligned up or down by 10dB? (Site not responding. Last check: 2007-10-21)
		This is not an accurate name as the LFE channel's frequency response extends down to the same frequency as the main channels, i.e.
		If the LFE channel is aligned at the same level as the main channels then a loud explosion effect could easily overload the tape (or hard disk) recording machine.
		The LFE output of the processor should be connected to the LFE input of the subwoofer.
	www.genelec.com /support/faq/faq40.php (914 words)

	ButtKicker LFE Electromagnetic Transducer
		Considered by many to be the holy grail of home theater components, the ButtKicker LFE infuses your existing home theater system with a powerful jolt of energy, literally bringing the audio soundtrack to life.
		The ButtKicker LFE offers scores of improvements over the original, including an enhanced magnetic circuit that increases the unit's overall efficiency and power, and reduces the amount of amplification it requires in certain installations.
		With one ButtKicker LFE connected, the amplifier is rated for 1100-watts (a 4-ohm load).
	www.smarthome.com /82572.html (1070 words)

	Surround Associates - Specializing in all aspects of surround sound.
		The LFE, which has a frequency response from about 25Hz to 120Hz, is unique in that it has an additional 10dB of headroom built into it.
		In general, the LFE channel should be used judiciously regardless of the type of material that you’re mixing.
		A separate LFE channel is sometimes not required since most touring and fixed sound reinforcement systems already supply sufficient low frequency response and headroom (thanks to some really massive subwoofers) to accommodate any low frequency effect that the artist requires.
	www.surroundassociates.com /fqmain.html (11928 words)

	HSU Research Forum (HRF) :: True Subwoofers and Home Theater Systems - LFE output split 3 ways. Ok for bass optimizer?
		The bass optimizer will replace the current sub connection, but still be sharing the LFE output split with the two bass shaker channels.
		I have my receiver LFE level booster up (but not to max) a bit to compensate for the LFE fan out.
		Basically I am using the bass optimizer as a LFE distribution amp in addition to its normal function.
	www.hsuresearch.com /forum/showthread.php?t=963 (411 words)

	SoundStage! Feature Column - How Important Is the LFE Subwoofer to Home Theater?
		When you turn LFE on something else happens in the decoder circuitry that causes the midrange and highs to loose air and to sound slightly squashed, gray and dry compared to what you hear when LFE is off.
		The LFE bass should be redirected to large main speakers at -6 dB so that the 2 main speakers produce bass at the intended level.
		Many processors fail to reduce the bass level when LFE is off which results in just about double the intended bass loudness in the room from your large main speakers.
	www.soundstage.com /video/columns/200003_db_hometheaterbass.htm (2171 words)

	Bass Management - 1
		To allow the reproduction of powerful sub-bass effects in analog movie soundtracks –; asteroids crashing into the Earth and dinosaur footfalls for example – it was necessary to assign such signals their own channel to minimize intermodulation distortion and other unwanted artifacts, and maximize headroom.
		Nobody at home will know if you didn’t put anything in the LFE: if they have a sub and put their ear to it, they will hear something (the bass from all the other channels: bass management in action) so they can’t tell.
		At the consumer’s home, the LFE is not connected directly to the subwoofer, and it should not be connected that way in the studio.
	www.ambisonic.net /bassmgt1.html (1014 words)

	VideoHelp.com :: View topic - LFE channel, AC3 encoding
		After i've encoded the AC3 the LFE is mute, if you open it on soft encode the channel is their, but its silent...
		Also it may be that your HT receiver handles LFE separately with an 80Hz cutoff, and you just don't have than much low frequency stuff in the LFE channel.
		I think LFE is used for effects like blasts, jet roar, rumbles, and other low low frequency stuff.
	www.videohelp.com /forum/viewtopic.php?t=111830 (419 words)

	New thread for Onkyo HTS-650 LFE problem
		I have had no problem with LFE on Mode three, however I use the coax input, my son-in-law had coax but then used optical and had lfe problems.
		If you have the LFE problem, it may be difficult to discern watching a movie in mode 1 because you are also getting the bass from the other channels.
		LFE, my STB 5.1 is decoded perfectly using video 1 input and optical, go figure.
	forum.ecoustics.com /bbs/messages/3/1929.html (3178 words)

	Hydrogenaudio Forums -> How many bits should be given to LFE in 5.1?
		FAAC performs more reasonably, but it varies bitrate for LFE too much even though there shouln't be any psychoacoustics for LFE...
		Here is a graph that illustrates this case for 5.1 castanet.wav encoded at 320 kb/s (front pair is castaners.wav, back pair is also castanets.wav, center is castanets.wav but only left channel and LFE is also castanets.wav left channel).
		Hypothesis: Nero AAC expects a regular LFE channel (ie already lowpassed) as LFE and not a full frequency channel.
	www.hydrogenaudio.org /forums/index.php?showtopic=32068 (655 words)

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