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The V1

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  • The V1

    Done. I have to thank rpb and Javad Shazi for their tutoring with PCD and crossover design. I couldn't have done it without you guys. This was my first real ground up build that is all my own. The learning curve was a bit steep but if it was easy everybody would do it. I know my way around speaker design a little better now. But make no mistake. I still have a lot to learn and this project just makes me hungry for more knowledge. This design actually went through 20-30 different iterations before I made any sawdust. But, in the end I think it has turned out pretty well. It is a bit bass heavy (which I like) but I can change that with a resistor change in the crossover so I will listen for a while and if need be I will change it. The frequency response runs down hill about 6 db from low to high. The speaker sounds well blended. They image really well in my shop with just enough edge on the mids and highs that voices are crisp but not enough to become fatiguing at even the highest output. My living room tends to boost bass so I may end up adjusting the down hill tilt of of the crossover when I move them up there.

    The tweet is a Satori TW29DN-4 in the same wave guide as used in the Helios. The woofer is a Volt BM 228.8

    Measurment


    Crossover


    Listening


    Response Left Vs Right


    Polar 0, 15, 30 and 45 Deg.
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    Matthew
    BSME
    Kannapolis NC

  • #2
    Measurement 18"
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    Measurement 1m
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    Sim overlay 18"
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    Sim overlay 18" reverse polarity
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    Sim overlay 2m
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    Matthew
    BSME
    Kannapolis NC

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    • #3
      Impedance
      Click image for larger version  Name:	IMP.JPG Views:	0 Size:	503.3 KB ID:	1440705

      Crossover
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      Matthew
      BSME
      Kannapolis NC

      Comment


      • #4
        there are several issues with your design.
        craigk

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

        Comment


        • #5
          Yes. There always is. Working toward a higher level is progressive.

          Matthew
          BSME
          Kannapolis NC

          Comment


          • #6
            You have a 2 nd order electrical crossover. The tweeter needs to be wired out of phase from the woofer. Just swith the wires on your tweeter. 17 ohms resistance on the tweeter is a lot of resistance. Maybe think about going to an L - pad. Then if you need to lower the tweeter, use a few ohms where you 17 ohm resistor is now. You are getting there. You have nice drivers, you should have a really good sounding speaker when you are finished
            craigk

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

            Comment


            • #7
              Originally posted by craigk View Post
              You have a 2 nd order electrical crossover. The tweeter needs to be wired out of phase from the woofer.
              Not sure this is true. As long as phase tracking is good I don't think it really matters. I tried 2nd and 2nd, 1st and 3rd, 3rd and 3rd, 2nd and 4th and 4th and 4th. No matter what I did I couldn't get rid of the tweeter response crossing the summed response @ 2800 and measured @ 18". I don't listen @ 18" anyway and the phase gets better as the measurements move back. The phase tracking is pretty good @ 1m and gets better @ 2m. Not sure if this is real or maybe wave guide interaction or room interaction with the measurements. At any rate the speaker sounds really good. I may have a bit too much padding as my living room has more room gain than my shop. I will know when I move them up there and listen and measure.

              As far as the padding I agree with you on the resistor layout. I can probubly use an L-pad and reduce or delete the series resistor. It was just sounding and measuring good the way it was so I didn't change it.
              BSME
              Kannapolis NC

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