April 29, 2009, by Mark Frink
This is the 40th anniversary of Altec Lansing’s passive third-octave “continuous” equalizer that began modern sound system equalization.
It didn’t start as a graphic equalizer, but rather, was three rows of eight knobs on third octave centers. A companion third-octave real-time analyzer, three rows of eight VU meters, provided a means to measure a sound system.
Subsequent Altec EQs replaced the knobs with a row of sliders, earning the name “graphic” because their positions provide a graphic display of the equalizer’s response.
Today the favored device to quickly equalize temporary sound systems is still a graphic equalizer, whose third-octave filters on standardized frequencies give engineers a consistent set of EQ controls, as well as providing a universal vocabulary for describing a wide range of audio tones.
I won’t argue that there aren’t better ways of equalizing and optimizing the response of a sound system, but when time is tight, a good graphic EQ in the hands of a good engineer is usually “good enough.”
A quarter-century ago, Crown’s Techron division unveiled the TEF System 10, the first portable Time Delay Spectrometry acoustical measurement system. Now owned by Gold Line, TEF provides near anechoic measurements due to its tracking filter.
Two decades ago, Meyer Sound developed source independent Fast-Fourier Transform measurement using Hewlett-Packard’s 3582A dual-channel FFT analyzer, released as SIM II in 1992 and updated in 2003 as SIM 3.
SIA Software (now Rational Acoustics) Smaart put FFT onto laptop computers one decade ago, providing high-definition measurement to the average sound engineer.
More recently, the new Studio Six Digital FFT iPhone application puts single-channel FFT measurement into the hands of the masses.
With higher resolution, it becomes obvious that some frequency response problems aren’t fixable with the average equalizer, whether graphic or parametric.
Since being introduced in the 1970s, third octave graphic equalizers have been a standard in live sound, offering a set of overlapping filters that cover all frequencies. Professional sound systems employ one for each channel: two for stereo main systems and one for each channel of floor monitors.
Read more...
http://www.prosoundweb.com/article/print/sound_shaping_using_graphics_equalizers_to_optimize_your_system
God Bless,
Don
Check out my Web Pages and Blog’s too...
Don's Music and Poems at DonSongs.com
DonSongs! Download Both Albums in MP3's Free! Also, there's Pages of my Songs, Poems and Pic’s of me and friends:>) www.DonSongs.com
DonSongs New Site With Music Players for Both Albums and New Page Design...
Download The Whole Living Beings - Climate Control Album Free!:) We have our New Album Out Now! With me, Don Bishop doing Vocals and Lyrics and Marty Splawn Playing all the Music! And You can Download the whole Album Free!
http://bishopco.com/LivingBeings/LivingBeings-ClimateControl-mp3.html
And here’s an alternative Living Beings download site that also has smaller 64Kbps M3U versions for Dialup connections and it has Streams of the complete album too if you just want to listen online without saving the MP3’s. http://www.archive.org/details/DonBishopLivingBeingsClimateControl
Living Beings Blog has some MP3 Song clips from our Living Beings - Climate Control album. Also, I put up some of my favorite Pic’s. http://livingbeings.blogspirit.com/
And here’s an alternative DonSongs download site that also has smaller 64Kbps M3U versions for Dialup connections and it has Streams of the complete album too if you just want to listen online without saving the MP3’s. http://www.archive.org/details/DonBishopDonSongs002
CMU - Christian Music Underground
CMU was started by Don Bishop to share the music of myself and of course the rest of you guys who are among the non commercial artists out there who work hard at their music and want to Glorify, Praise and Share the Love of our Lord Jesus.
http://christianrocker.com/index.php?mode=player&type=radio&id=79
DonSongs Blog... This is a Collection of Songs written & Sung by Don Bishop from 01-1991 to 03-2002.http://donsongs.blogspirit.com/
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