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Iron Driver speaker measurement 2015

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  • #16
    Re: Iron Driver speaker measurement 2015

    continuing
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    http://www.diy-ny.com/

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    • #17
      Re: Iron Driver speaker measurement 2015

      JasonP
      This system featured rear firing woofer in a sealed box. Interesting design because the woofer overlaps in to the lower mid-range territory and drastically changes imaging. The total response is fairly flat which is difficult to do.
      Best low end IMO and weird imaging.
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      http://www.diy-ny.com/

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      • #18
        Re: Iron Driver speaker measurement 2015

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        http://www.diy-ny.com/

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        • #19
          Re: Iron Driver speaker measurement 2015

          RonE
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          http://www.diy-ny.com/

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          • #20
            Re: Iron Driver speaker measurement 2015

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            http://www.diy-ny.com/

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            • #21
              Re: Iron Driver speaker measurement 2015

              Kerry The Navy Guy
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              http://www.diy-ny.com/

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              • #22
                Re: Iron Driver speaker measurement 2015

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                disregard a small spike at 150hz in woofer distortions.
                http://www.diy-ny.com/

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                • #23
                  Re: Iron Driver speaker measurement 2015

                  I have one more system to test. It's the Squid and Jay1 collaboration. The results will be posted later on that one.
                  Thanks all!
                  http://www.diy-ny.com/

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                  • #24
                    Iron Driver speaker measurement 2015

                    Originally posted by r-carpenter View Post
                    Kerry The Navy Guy
                    [ATTACH=CONFIG]57389[/ATTACH]
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                    Hmm, very interesting. That is a huge difference between what you measured and what I measured. I wonder if something is wrong with my Omnimic. That slow rise over the entire band makes me think I might have an incorrectly calibrated mic. I was showing around 2-3db lower at 1khz and around 6-7db at 20khz in my measurements. I was getting about +/- 2db in my sims and my rough measurements to confirm proper wiring were showing about +/- 3db. I'll be posting the write-up soon and will perform another full set of measurements for comparison.
                    Last edited by Navy Guy; 05-19-2015, 01:20 PM.
                    -Kerry

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                    • #25
                      Re: Iron Driver speaker measurement 2015

                      Navy Guy,

                      I can see why people liked your entry. Those are some pretty good looking graphs. I have a theory that a rising high end actually helps when you have a group listening contest since a fair number of listeners are going to end up off axis.

                      Thanks for all the work on the measurements Roman. Your FR measurements look a lot like mine including that sad 5db dip in the middle. It's a really bad place to have some dropout. I ran out of time or I might have been able to iron that out.

                      Ron
                      C-Note Iron Driver Build
                      The Lydias
                      The Cherry π's
                      The Champs - Iron Driver 2015 Entry
                      My Projects Page

                      The good thing about science is that it's true whether or not you believe in it. - Neil deGrasse Tyson
                      http://www.youtube.com/watch?v=cjuGCJJUGsg

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                      • #26
                        Re: Iron Driver speaker measurement 2015

                        Ron, I think that dip is pretty similar to a BBC dip. I guess this competition proves it is favorable.
                        http://jaysspeakerpage.weebly.com/

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                        • #27
                          Re: Iron Driver speaker measurement 2015

                          Originally posted by Ron_E View Post
                          Navy Guy,

                          I can see why people liked your entry. Those are some pretty good looking graphs. I have a theory that a rising high end actually helps when you have a group listening contest since a fair number of listeners are going to end up off axis.

                          Thanks for all the work on the measurements Roman. Your FR measurements look a lot like mine including that sad 5db dip in the middle. It's a really bad place to have some dropout. I ran out of time or I might have been able to iron that out.

                          Ron
                          Your theory about rising high end and group contest makes sense to me.

                          Regarding the 5k dropout, that is on-axis. Off-axis FR looks pretty flat, and that was where I was sitting. Your speakers sounded very good to me there.

                          Out of curiousity, what would cause that kind of on/off-axis response and what would have done to address it given more time?

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                          • #28
                            Re: Iron Driver speaker measurement 2015

                            Originally posted by jclin4 View Post
                            Your theory about rising high end and group contest makes sense to me.

                            Regarding the 5k dropout, that is on-axis. Off-axis FR looks pretty flat, and that was where I was sitting. Your speakers sounded very good to me there.

                            Out of curiousity, what would cause that kind of on/off-axis response and what would have done to address it given more time?
                            it is not uncommon at all for a speaker to measure and sound better off axis. leave it alone and be happy with what you have is the best thing to do.
                            craigk

                            " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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                            • #29
                              Re: Iron Driver speaker measurement 2015

                              Originally posted by craigk View Post
                              it is not uncommon at all for a speaker to measure and sound better off axis. leave it alone and be happy with what you have is the best thing to do.
                              I hear what you are saying. Just seems strange that off-response would be greater magnitude in that region than on-axis.

                              I have seen that kind of behavior in the midrange for open-baffle speakers, but this is not the case.

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                              • #30
                                Re: Iron Driver speaker measurement 2015

                                I was actually taking that into consideration when building these and intended to leave the top end about 2 db hot (which is actually how I like it in my room, otherwise things sound too bass heavy). I know realized after I had already shipped that I accidentally messed up the crossover and used a 3 ohm resistor instead of a 4 ohm like I intended, but that is not enough to cause the difference between what I was seeing and Roman's measurements. I'll post my sims in just a bit so you can see what I'm talking about. I really think there must be some issue with my measurement setup and I'm leaning toward a
                                -Kerry

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