L-padding a tweeter

Discussion in 'Archived Threads 2001-2004' started by Noah Levy, Feb 16, 2002.

  1. Noah Levy

    Noah Levy Auditioning

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    I'd be very greatful if someone could clarify what it means to "tweak the tweeter l-pad". I've read in a couple places that people adjust the "l-pad", and wasn't sure what that meant. Is it simply tweaking an inductor in the high pass circuit?

    Thanks in advance for anyone's help.

    Great forum!!!
     
  2. Patrick Sun

    Patrick Sun Moderator
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    It means using 2 resistors (their values being judiciously chosen to maintain a certain nominal impedance of the tweeter while also reducing the amount of current sent to the tweeter, thus reducing the output of the tweeter) in a L configuration to pad the tweeter output.

    One resistor, Rp is placed in parallel to the tweeter's input, and the other resistor, Rs is placed in series with the Rp parallel connection with the tweeter.

    L-pads are used to balance the tweeter out from the rest of the drivers in the speakers, mainly because tweeters tend to have higher SPL efficiencies since it doesn't take as much energy to play loudly at high frequencies (over 2KHz) as it does for woofers/midranges.
     
  3. Noah Levy

    Noah Levy Auditioning

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    Very helpful. Thanks!
     

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