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DIY less air/bright

Discussion in 'Pro Audio Equipment' started by Lordnielson, Mar 2, 2008.

  1. Lordnielson

    Lordnielson Guest

    Anybody still around?.....

    I'm wondering if there's a way to lessen the bost on the air/bright/deep switches. I'm actually using my Sebbox alot for running mixes and other itb stuff thru. The switches are a useful addition that I'd probably use alot more if they were a little less obvious.
    Spill the beans Seb..

    Cheers
    Pete
     
  2. Sebatron

    Sebatron Well-Known Member

    ....sure..... 8)

    The simplest way is thus:

    Locate the two ceramic caps associated with the bright/air switch...
    They are connected to the two outer terminals of that particular toggle switch.

    The 'air' cap has a value of 470pf ,,
    you could change this to something smaller like 390pf or 330pf etc.
    As the value gets smaller so does the amount of high frequency boost...

    Likewise the 'bright' cap , which has a value of 1000pf ,
    could be changed to 820pf or 680pf etc. for less boost...

    You get the idea.... :wink:

    ~S~
     
  3. Lordnielson

    Lordnielson Guest

    Spot on... You're the man Seb


    Thanks and happy trails
    Pete
     
  4. Lordnielson

    Lordnielson Guest

    Now someone recently told me that capacitors are like static potentiometers.

    So I thought how nice it would be to be able to control the bright amount with a pot.

    Am I talking nonsense ?
     
  5. Sebatron

    Sebatron Well-Known Member

    No but the person who told you that "capacitors are like static potentiometers" is...

    Caps and Pot are totally different Biology and affect different parts of the brain.


    Lift up one side of the relevant capacitor (either 'air' or 'bright' ),..
    Take a pot ( 10k may be appropriate but less may be better),
    connect the wiper ( middle pin ) of the pot to lifted end of that capacitor...
    Connect just one of the outside pins of the pot to where
    the capacitor was connected prior to you lifting up that end..


    That will make the amount of bright/air variable ..
    By experimenting with different values of cap and pot you should be able
    to get a workable shelf.
    This is Passive EQ of course and the curves can be gentle and unobtrusive.

    You could also hook up a pot to the 'deep' switch , just follow the
    pin layout of the switch and
    apply it to the potentiometer ( after dis-connecting the switch of course ).... :wink:
     
  6. Lordnielson

    Lordnielson Guest

    Those are some hard facts there Seb :)

    You are a true gentleman
     
  7. Lordnielson

    Lordnielson Guest

    Update.

    Tried a 10k pot and that did nothing at all (Alpha B10k to be exact).

    The only other pot I had around was a guitar pot (.250K I think).
    That one worked fine but, as would be expected, wrecked the sound quite a bit.

    Questions:

    Should I maybe shoot for 5-6k? which pots are good quality ones?

    What's this I hear about a new eq? New products announcement soon ?

    Is the Proxima basically a Nitrous with a preamp thrown in for free ? Minus the sidechain of course.


    All the best.
    Peter
     

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