Announcement

Collapse
No announcement yet.

Tech evaluation of the Iron Driver Loudspeakers

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #46
    Re: Tech evaluation of the Iron Driver Loudspeakers

    Originally posted by scottq View Post
    Yes, awesome work Roman! Thanks so much for the extra effort and the time you've put into sharing thoughts on each!

    I look forward to fixing these. The budget made things very difficult, indeed, but I wanted to stick with the primary goals and all the challenges/concepts. That said, I am certain there is room for improvement, even within the budget. The measurement woes were my own fault... the procrastinator in me let things slide way too long. I should have known better with all upgraded equipment that things wouldn't go as smooth as I planned.

    I warned you about their inefficiency - tripling the moving mass really takes a hit on sensitivity! I tested and did listening on a GFA-5400 for a reality check rather than my bridged Parasound 1500A's (rated for 630 Wrms); for almost all material at enjoyable volumes in a living room, the 5400 was plenty capable... a few dynamic orchestral passages made the overload indicators flicker, but most things did just fine. They aren't PA speakers, that's for sure. Low-power receivers realistically aren't going to cut the mustard. But there are plenty of great 2ch amps available on the used market for under $300 (picked up my 5400 for $225 shipped).

    I was pleased to find out that several of the songs on the demo disc were ones that I listened to on them at home... Jeff, the mixes were very well done; thanks for your efforts too

    And, of course, thanks to Mike! I sympathize with the effort that goes into these events...

    Be on the lookout for the Apertures v2 at SEC DIY 2012.

    Regards,
    Scott
    My monster of an amp took care of it just fine. Please post your tweaking results, there is a lot to be learned seeing as they are pretty close to begin with. I really like the mass loaded woofer idea, and wonder how this may fare with some pro woofers like the 10" dayton. You eat up some eff but can end up with a good low FS and high enough Q to have an awesome sealed or apriodic enclosure.
    .

    Comment


    • #47
      Re: Tech evaluation of the Iron Driver Loudspeakers

      Originally posted by Pete Basel View Post
      Nice work Ron, very nice! It looks from the dip in the woofer output as if the system is tuned
      to about 28 Hz, and if you check the total summed output the response is very far down, about
      20 dB relative to 1K. The system being so far down will not have much useful output there.
      I suggest that you bring the port tuning up to about 35 to 40 Hz and you should
      see a significant improvement in output. The cone excursion should be low at the tuning freq
      but it is high at about 1.4 times it, tuning higher will provide better excursion limited output
      at both the tuning frequency and above. Still, a very nice design, looks professional also!
      I was just looking at the Sim I did and the design called for a tuning of 36. I'm not sure how I missed that Pete and Roman. I'll be retuning the port when I get them back.





      Ron
      Last edited by Ron_E; 09-17-2012, 10:11 PM. Reason: Messed up copy and paste.
      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

      Comment


      • #48
        Re: Tech evaluation of the Iron Driver Loudspeakers

        I'll fix the images shortly. Looks like they got messed up by the forum software since they're fine on my machine.

        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

        Comment


        • #49
          Re: Tech evaluation of the Iron Driver Loudspeakers

          Originally posted by Ron_E View Post
          I'll fix the images shortly. Looks like they got messed up by the forum software since they're fine on my machine.

          Ron
          I fixed the images. It looks like they got reformatted to low quality Jpegs by the system.

          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

          Comment


          • #50
            Re: Tech evaluation of the Iron Driver Loudspeakers

            going to post last two speaker measurements. Mine and David's.
            http://www.diy-ny.com/

            Comment


            • #51
              Re: Tech evaluation of the Iron Driver Loudspeakers

              Mine.
              measurement issue with impedance phase resolved and picture changed
              Attached Files
              Last edited by r-carpenter; 09-18-2012, 11:03 PM.
              http://www.diy-ny.com/

              Comment


              • #52
                Re: Tech evaluation of the Iron Driver Loudspeakers

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

                Comment


                • #53
                  Re: Tech evaluation of the Iron Driver Loudspeakers

                  So-so on axis with a nice off axis linear response. Nonlinear are as good as any. Well dampened cabinets with wide pass-band of the port output. Stable 7-8ohm impedance with horrible phase swing(could be a measurement issue) at the crossover F
                  Attached Files
                  http://www.diy-ny.com/

                  Comment


                  • #54
                    Re: Tech evaluation of the Iron Driver Loudspeakers

                    I've saved RASTI and STI for my speaker somewhere else and can't find it now. Will post it in a couple of days
                    http://www.diy-ny.com/

                    Comment


                    • #55
                      Re: Tech evaluation of the Iron Driver Loudspeakers

                      David Crewe.
                      (missing vertical off axis and may redo it tomorrow)
                      Attached Files
                      http://www.diy-ny.com/

                      Comment


                      • #56
                        Re: Tech evaluation of the Iron Driver Loudspeakers

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

                        Comment


                        • #57
                          Re: Tech evaluation of the Iron Driver Loudspeakers

                          Comments are welcome. This set concludes measurements of the competing loudspeakers.
                          Attached Files
                          http://www.diy-ny.com/

                          Comment


                          • #58
                            Re: Tech evaluation of the Iron Driver Loudspeakers

                            Did you do any measurements on the possible effects of the screen on FR?

                            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

                            Comment


                            • #59
                              Re: Tech evaluation of the Iron Driver Loudspeakers

                              not yet Ron. I could do it tomorrow.
                              http://www.diy-ny.com/

                              Comment


                              • #60
                                Re: Tech evaluation of the Iron Driver Loudspeakers

                                Originally posted by Ron_E View Post
                                Did you do any measurements on the possible effects of the screen on FR?

                                Ron
                                I was wondering that exact thing after seeing the last two.
                                https://www.youtube.com/channel/UCm2...oSKdB448TTVEnQ

                                Comment

                                Working...
                                X