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accenting freq thru subtractive EQ

Discussion in 'Recording' started by SteveH, Jun 5, 2004.

  1. SteveH

    SteveH Guest

    Is there a "science" to subtractive EQ where cutting in a specific area "boosts" or accentuates a higher area of freqiencies?

    Let say, for example I cut 3dB at 125-250Hz and then I hear it as if I boosted at 3000-4000 Hz. (Just an example)

    I read somewhere (can't remember where) that there is a "chart" of corresponding frequencies - cut @ so-and-so is like boosting @ so-and-so.

    Anyone? Help?

    Muchas Gracias.
     
  2. jonyoung

    jonyoung Well-Known Member

    I don't know that it's that cut & dried. Every instrument or voice is going to have a unique harmonic structure, so what you hear as a result of what you cut is going to depend on what else is there. In purely theoretical terms, I could see this being true, but when's the last time anyone here ran into pure theory in a session? A teacher of mine told the class once about a classical session where some engineers in lab coats (no joke) were measuring distances based on wavelengths for optimal mic placements. It sounded awful, they forgot to use their ears.
     
  3. Kurt Foster

    Kurt Foster Distinguished Member

    With a simple eq, that has only low and high boost / cut controls, by turning down the lows and highs a bit, you are effectively boosting the mids..

    Look at it as if the freq response was a straight line running horizontally through the middle of a piece of paper.. by lowering the low freq control you bring the line down on the lo side but it returns to the middle after a while .. doing the same with the high freq control does the same thing on the high side ... There! You have just boosted the mids! Now bring up the fader to make up the gain you just cut by pulling down the lows and highs.
     
  4. SteveH

    SteveH Guest

    Well, thanks for chiming in...

    I saw in an audio magazine someone posted a chart or a general theory about certain lows cuts connecting with a perception of a boost in highs

    Anyone else know what "chart" or guidelines I'm referring?

    Why boost at 5k-7k when you can cut at ....?
     
  5. djui5

    djui5 Guest

    When you cut the lows of a signal the high's come through more. Ever cut the lows on a muddy guitar signal? suddenly you can hear the mids/upper mids more. Not because you boosted the upper freq range...but because you cut the lower range that was masking it.
     
  6. SteveH

    SteveH Guest

    Yes, I understand the "cut the lows = get some highs" from my experience in mixing.

    But what I'm trying to find is a chart that I once saw in an audio magazine which talked of correspoding lower and upper freq. It was posted by an audio engineer. He actually posted a theory/equation to find which lower freq when cut will accentuate certain higher freq. His chart was very specific.

    Wish I could remember which mag and which engineer posted that info. Just curious to study his results with my experiences.
     
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