Please explain this frequency response thing to me

Discussion in 'Speakers' started by MichaelDDD, Oct 22, 2003.

  1. MichaelDDD

    MichaelDDD Supporting Actor

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    Mike
    Hello HTF,

    I was checking out the specs on my Axiom VP-150. The frequency response info says:

    Freq Resp +/-3dB (Hz) 85-22K
    Freq Resp +3dB/-9dB (Hz) 50-22K


    I understand the 85Hz-22KHz, plus or minus 3db.

    What's the second line mean? Why do they list the +/-3 and -9 like that?

    What crossover point would you use for this speaker?

    Educate me, please.

    VP-150 Link
     
  2. ColinM

    ColinM Cinematographer

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    It gives a bigger picture of the response as it gets deeper and quieter.

    IOW, it'll do 50hz, but that'll be 9-12db quieter than the loudest point in the graph. Not misleading, just honest.

    Like for a sub manufacturer - If they said 10Hz - 150Hz, +/-10db, it's a 20db spread, and it's easy to get that 10Hz figure. But you may never hear it.

    I remember a Bose review in Sound & Vision. In the graph, they spec'd 30-17kHz, +/-10.5db.


    OH - and I'd xo at 100 or so....
     
  3. MichaelDDD

    MichaelDDD Supporting Actor

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    Hi Colin,

    Oh, I get it. Kinda like the speaker's "rolloff", right? [​IMG]

    I was thinking a 100Hz xo as well. Thanks. [​IMG]
     

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