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  • Iron Driver speaker measurement 2015

    First of all, I'd like to thank all participants for taking part in this competition. It takes dedication, commitment and guts!
    This years competitors show good deal of attention to the non linear performance (with the exception of 1) and majority of the differences and coloration was in the linear department. Basically, all systems had low distortions and varying frequency response.

    How were the measurements taken.
    On axis far field response was taken at 80cm-1m. 5msc gating.
    Port and the woofer were measured near field with the mic position either at terminus of the port or at 1cm away from the woofer diaphragm. 500msc gating
    Distortions were taken near field as well. While the input voltage was 2.8, the mic gain was adjusted so do not look at distortion measurements as absolute. They are only there to show potential problems like un-dampened resonances or badly executed crossovers.
    The near and far field responses were then spliced with addition of the port output and individually calculated diffraction.
    Mic: calibrated Earthworks M30
    Software: Sound Easy V19
    The SPL is relative.

    I am going to go from the lower scoring speakers first and continue to the winners and will add pictures from Mrs's camera later.
    Last edited by r-carpenter; 05-18-2015, 11:57 AM.
    http://www.diy-ny.com/

  • #2
    Re: Iron Driver speaker measurement 2015

    KennyK
    This is the only speaker which had highish nonlinear distortions. The distortion spike is in the passband of the woofer and relates rather to the woofer choice than the designers crossover skills.
    Waveguided tweeter and DS series Dayton woofer.
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    http://www.diy-ny.com/

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    • #3
      Re: Iron Driver speaker measurement 2015

      continuing with KennyK
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      The impedance of the system is quite good but 3rd harmonic and exaggerated mid-range made the speaker sound forward. There are some standing waves in the cabinet.
      http://www.diy-ny.com/

      Comment


      • #4
        Re: Iron Driver speaker measurement 2015

        Which graph shows the distortion?

        Apart from what looks like a baffle-step issue, there seems to be something odd going on between 60 and 70 Hz.
        Brian Steele
        www.diysubwoofers.org

        Comment


        • #5
          Re: Iron Driver speaker measurement 2015

          Marc Sibilia
          3 way design with unknown to me mid, front facing port and MCM woofer.
          First attempt for Marc to design a passive system.
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          http://www.diy-ny.com/

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          • #6
            Re: Iron Driver speaker measurement 2015

            Originally posted by Brian Steele View Post
            Which graph shows the distortion?
            NM.
            Brian Steele
            www.diysubwoofers.org

            Comment


            • #7
              Re: Iron Driver speaker measurement 2015

              continuing with Marc
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              I found to be the system, well balanced and was surprised at it's low scores.
              http://www.diy-ny.com/

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              • #8
                Re: Iron Driver speaker measurement 2015

                Next system is by Mathew Vach
                It's midsized ported 2-way, pairing SB tweeter to Eclipse woofer.
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                http://www.diy-ny.com/

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                • #9
                  Re: Iron Driver speaker measurement 2015

                  Click image for larger version

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                  While non linear distortions are low, linear distortions are fairly high. The impedance and the cabinet tuning are good.
                  http://www.diy-ny.com/

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                  • #10
                    Re: Iron Driver speaker measurement 2015

                    Ani's mocking jay speaker.
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                    http://www.diy-ny.com/

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                    • #11
                      Re: Iron Driver speaker measurement 2015

                      Click image for larger version

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                      distortion bump at 1k but I don't believe it was audible.
                      http://www.diy-ny.com/

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                      • #12
                        Re: Iron Driver speaker measurement 2015

                        DerekJ
                        Small ported 2-way. This one was actually one of my favorite systems. While the response made it sound a bit forward, the imaging was the best of all.
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                        http://www.diy-ny.com/

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                        • #13
                          Re: Iron Driver speaker measurement 2015

                          Continuing with Derek.
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                          http://www.diy-ny.com/

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                          • #14
                            Re: Iron Driver speaker measurement 2015

                            I will post the rest of the measurements, later on today.
                            http://www.diy-ny.com/

                            Comment


                            • #15
                              Re: Iron Driver speaker measurement 2015

                              Face
                              I found this system to be most neutral of all.
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                              http://www.diy-ny.com/

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