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Slightly Different Impedence Question

Discussion in 'Amps and Cabs [BG]' started by Waabs, Nov 21, 2004.

  1. Waabs

    Waabs Employee, Musical Instrument Retail

    Aug 1, 2004
    I remember reading here that the impedence of a cabinet changes over its frequency response.

    Is the impedence lowest when the frequency response is the greatest? Say if you were looking at a graph of the frequency response and a graph of the impedence would the impedence graph be like the frequency response graph but inverted?

    So when the frequency response rolls off at the high and low end the impedence the highest.
  2. Tim__x


    Aug 13, 2002
    Alberta, Canada
    No, the impedance curve will generally be pretty flat with one (sealed) or two (ported) peaks at low frequencys and a slow steady rise above around 3-5K.
    This is assuming no tweeter, which would flatten the high-end rise and add another peak at 1-3k. No compensation network which also flattens the high-end and no crossover which greatly complicates things, somtimes they make a nice flat but peaky response other times they're a little complicated.
  3. nonsqtr

    nonsqtr The emperor has no clothes!

    Aug 29, 2003
    Burbank CA USA
  4. Waabs

    Waabs Employee, Musical Instrument Retail

    Aug 1, 2004
    Thanks for that guys. Very helpful.