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Chane models in measurements

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  • Chane models in measurements

    From time to time we're asked to provide the measured responses of our speakers. While there may be good reasons not to use just data to evaluate an acoustic product, it doesn't have to be ruled out entirely - when understood and kept in perspective it can be informative. I may post a perspective about data in a follow up remark.

    Following are the amplitude responses and impedance behavior of the Chane A1.4. The A2.4 and A5.4 follow.

    The amplitude responses are spliced combinations of nearfield bass responses and standard 1M gated MLS noise responses – audio-band impulses that briefly activate the entire speaker while minimizing local reflections. Since low frequencies involve very long wavelengths that activate environments – and real anechoic labs are so rare and costly - the MLS burst is used above a few hundred cycles to be captured by the microphone at 1 meter's distance. The portion of the plots below that point is calculated by summing very close-field speaker output. It's standard stuff but not all 1M MLS plots will include the bass response.

    The A1.4 is a classic asymmetrical 2-driver speaker. It's response will sum in the soundfield roughly like any other similar speaker, meaning that at 1M we have a reasonable approximation of what it'll do at your listening chair, but we won't be able to avoid the simple fact that its two drivers aren't coincident – they do not occupy the same space and their geometric interaction will vary their response with listener angle. (Since the A1.4's intended listening axis is actually slightly below the tweeter axis, sharp-eyed readers will notice that it's treble response differs slightly from the A2.4's response using the same tweeter.)

    Click image for larger version

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    Rust: on axis
    Blue: 10 degrees (horizontal)
    Green: 20 degrees
    Gold: 30 degrees
    Black: 40 degrees

    Click image for larger version

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    Rust: on axis
    Blue: +10 degrees (vertical)
    Green: +20 degrees
    Gold: -10 degrees
    Black: -20 degrees

    Click image for larger version

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    Black: impedance magnitude

    [corrected imp plot 7/7]

  • #2
    A2.4 responses

    The A2.4 is a symmetrical twin-midwoofer, 3-driver 2-way, meaning it has a second identical midwoofer on the other side of the central tweeter. It can be used either horizontally or vertically (while its tweeter should always be vertical).

    The first response is a summed average of a number of points within the intended listening window. Further, since MTM speakers like the A2.4 will not provide the same driver triangulation at 1M as they do at your listening chair, such an average is a more characteristic representation of what they do at distance.

    NOTE: Impedance magnitude updated 4/18 to reflect the 2018 A2.4.

    Click image for larger version

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    Black: average window response

    Click image for larger version

Name:	A2.4 hor_600.jpg
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    Rust: on axis
    Blue: 10 degrees (horizontal)
    Green: 20 degrees
    Gold: 30 degrees
    Black: 40 degrees

    Click image for larger version

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    Rust: on axis
    Blue: 5 degrees* (vertical)
    Green: 10 degrees*
    Black: 15 degrees*

    *Since the A2.4 is acoustically symmetrical, these figures correlate to 10, 20, and 30 degree windows along its long axis.

    Click image for larger version

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    Black: impedance magnitude

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    • #3
      New A5.4 responses

      Gated response at 2.83v input, averaged around the speaker's 1M listening window.

      Click image for larger version

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      Next, the A5.4's impedance. Impedance minimum does not fall below 4 ohms, and impedance phase angle is +40/-20 degrees above the speaker's bass impedance peaks. The A5.4 is therefore easy to drive but will respond well to amplifiers that approximate constant voltage current sourcing into real loads. With 92.5dB output at a nominal 6 ohms, the A5.4 is also quite sensitive.

      Click image for larger version

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      This same data is presented in the Response tab in the A5.4 product page on the Chane site.

      Comment


      • #4
        Speaker data is a complex subject, one that's hard to pin down in simple terms. Whether it's useful as a casual gauge is debatable. For extended thoughts on speaker data click here.

        For general speaker operation, also try Chane's Loudspeaker Basics, and Sound Shopping.

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