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If anyone's eq speak's chinese, this may help.




Lows - 20Hz to 320Hz

Mids - 320Hz to 2560Hz

Highs - 2560Hz to 20kHz


The Mids are divided, by some:

Lower Mids: 320Hz to 1280Hz

Upper Mids: 1280Hz to 2560Hz




Octave 1 - 20 Hz to 40 Hz - ISO Center Freq. 31.25Hz

Bottom End. Very little musical content. Fundamental of the kick drum lives here. Most of this range IS NOT reproduced by loudspeakers.


Octave 2 - 40Hz to 80Hz - ISO Center Freq 62.5Hz

Lower Bass region. This octave forms the sonic foundation of most musical pieces. This is also the octave where the primary bass energy for a song lives. Low C is found here. Most loudspeakers play this octave but with wide variations in loudness.


Octave 3 - 80Hz to 160Hz - ISO Center Freq. 125Hz

Upper Bass region. This is the octave that forms the musical foundation. Bass and lower elements of the drum kit fundamentals are all included in this range. All speakers play this octave back.


Octave 4 - 160Hz to 320Hz - ISO Center Freq. 250Hz

Herein lies the "muddy" end of the spectrum. This is the transition octave between bass and midrange. Can best be described as "thick", "muddy", "thumpy". The "tenor" octave of musical pitches... This is also the range in which many instruments fundamental pitches exist within. Middle C lives here.


Octave 5 - 320Hz to 640Hz - ISO Center Freq. 500Hz

Lower mid-range. Emphasis in this octave allows for "body" or "richness". This also provides full, rounded tones. This is the primary treble octave of most musical pitches and fundamentals.


Octave 6 - 640Hz to 1.280kHz - ISO Center Freq. 1kHz

Midrange. Highest fundamental pitches live here. This octave marks the beginning for the harmonic content of many instruments. The level of harmonic content to fundamental content determines the instruments timbre. This octave begins the "spectral identifiers" for most instruments. Musical content includes pitches and central parts of most instruments spectra (tonal range).


Octave 7 - 1.280kHz to 2.560kHz - ISO Center Freq. 2kHz

Upper Mid-Range. This is the range where the phantom image comes into play. It is also the range that, when boosted, provides a hard, driving edge to the instrument. This range, also produces the effect of loudness, intensity and definition. A LOT of an instruments harmonic content lives in this range as well as the majority of the spectral identifiers for an instrument.


Octave 8 - 2.560kHz to 5.120kHz - ISO Center Freq 4kHz

This octave is known as the "presence" octave. Also heard as "edge" of hard consonants, when boosted. This is the primary range used for us to distinguish voices and recognize words. It's the upper end of a musical instruments spectrum and the critical musical and vocal range.


Octave 9 - 5.120kHz to 10.240kHz - ISO Center Freq. 8kHz

Highs... the treble range. Boosting this octave will produce and enhance the metallic brightness and sibilance. Musical content includes cymbals, upper end of the snare drum, metal guitar strings, etc. Sometimes this octave is referred to as "brilliance".


Octave 10 - 10.240kHz to 20.480kHz

Extreme high... you can shave w/ this octave. Boosting here provides airiness, sizzle... etc. There is little, or no, musical content in this octave. Mostly hi-hat noise lives in this region.



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Hey Diamond Dust, thanks for posting that-- did you write it yourself or is there a source you could cite?


I saw a book at the SAE in Manhattan, published by the school for their students and I've not seen it elsewhere, that had a chapter discussing eq for each instrument. It would take guitar oboe or sax or what ever, each getting it's own couple of paragraphs, and they'd list its bottom end and talk about it's character, the "mids" if it and the character, the Presence and all. It looked like a really cool reference book but I only saw it for a couple of minutes before a Sonar seminar there.


Anyway thanks for posting that, and BUMP btw.

check out some comedy I've done:


My Unitarian Jihad Name: Brother Broadsword of Enlightened Compassion.

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