space_cowboy Posted March 27, 2010 Share Posted March 27, 2010 Something I'm curious about, say a speaker is rated at 86Hz-23kHz +/-3dB and the low frequency extension is 64Hz. Why isn't the lfe considered in the overall frequency response, and what does the lfe really mean as part of the specs? Thanks Mark Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted March 27, 2010 Share Posted March 27, 2010 Go to: http://www.audioc.com/library1/glossary.htm#jkl Click on "L" and scroll down............... Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted March 27, 2010 Share Posted March 27, 2010 the reason the low frequency extension is not part of the initial specs is because of the way the tests are administered. The FR tests are ran in an anechoic chamber (ie no echos), this gives them the number that's listed above (86Hz) but low frequency extension is what is most likely probable, with in room boundary gain. When a given speaker is placed in a room with boundaries such as walls and corners a speaker will typically produce frequencies lower than what the specs define, do to room gain,the numbers (64hz) is probably typical but could be higher or lower depending on speaker placement. The reason you get the boundary gain is because of how low frequency sound waves are affected by .....boundaries. Low frequencies can "load" up by using surfaces they are close to. Quote Link to comment Share on other sites More sharing options...
dBspl Posted March 30, 2010 Share Posted March 30, 2010 Although this isn't always the case, the stated frequency response is an accuracy specification and therefore its purpose is to establish just that, rather than reflect the useable bandwidth of the system. Plus or minus 3 dB is a typical tolerance window, although it's not unusual to see a variety of others. An accuracy specification isn't very accurate at capturing the useable bandwidth of the system (particualrly low frequency extension), because output as much as 10 dB down is still considered audible. For this reason, the low frequency extension is usually broken out separately. dbspl Quote Link to comment Share on other sites More sharing options...
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