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For some questions about Paul Carmody's Voxel SUB, please ask for help

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  • For some questions about Paul Carmody's Voxel SUB, please ask for help

    Click image for larger version  Name:	W5-1138SMF-help.png Views:	0 Size:	36.8 KB ID:	1441128
    I am a novice DIY speaker, I believe some friends know.
    I want to install the speaker on the front or bottom. So I adjusted the size of the original cabinet, the volume is 7.8L. I don't know if my adjustment is correct, I hope to get your guidance. The plate I use is 18mm mdf, I bought a PVC pipe with an inner diameter of 38mm, and there is another kind of Port, which helps me choose the better.

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    I uploaded the SketchUp document to the Internet, which can be downloaded and viewed

    http://www.9sheng.cn/W5-1138SMF-help.rar


    Thanks again to Paul Carmody's for such an excellent design, and thanks to KEtheredge87 for sharing a lot of Voxel information.

  • #2
    Your box should work OK.
    I'd consider 38mm a MINimum dia. for the port - and still it's prone to chuffing. I'd put it on the back (at any rate - aim it AWAY from your listening postion).
    Even if the original Voxel used a 38mm port, the large roundovers (on the ends) cut down chuffing a LOT !
    Can you roundover (at least) your port's exit from the box (most people use a roundover bit in a router to do that).
    It's also recommended that your inside port ends one diameter from an interior wall (that would be 3.8cm). I think you've got 2.4cm? (it's possibly OK though)

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    • #3
      Originally posted by Chris Roemer View Post
      Your box should work OK.
      I'd consider 38mm a MINimum dia. for the port - and still it's prone to chuffing. I'd put it on the back (at any rate - aim it AWAY from your listening postion).
      Even if the original Voxel used a 38mm port, the large roundovers (on the ends) cut down chuffing a LOT !
      Can you roundover (at least) your port's exit from the box (most people use a roundover bit in a router to do that).
      It's also recommended that your inside port ends one diameter from an interior wall (that would be 3.8cm). I think you've got 2.4cm? (it's possibly OK though)
      A related question. Is this a general rule for port tubes or only for this design? If a port tube is too long for the enclosure can you get away with a 90 degree bend near the inside end?

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      • #4
        I'd shoot for a 1.5"id w/most 5" woofers, but - this being a long-stroke "sub", 2" would make me more comfortable.
        And YES, I'd definitely use an elbow (90, OR 45*). The effective port length is the same you'd get if you ran a tape measure right down the middle of the port (including any elbow radius).

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        • #5
          Thanks for that. That solution may be helpful for a future project.

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          • #6
            I flared the end of the port. Is this OK ?
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            • #7
              Looks good

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              • #8
                With the help of KEtheredge87, I went through some research. In the end, he chose his design. I think I like this appearance.

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                PORT my use PVC with 38 inner diameter and 42 outer diameter, and the length is 24CM
                I will build in the near future, and I will continue to share pictures with you

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                • #9
                  Originally posted by 9sheng View Post
                  With the help of KEtheredge87, I went through some research. In the end, he chose his design. I think I like this appearance.

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                  PORT my use PVC with 38 inner diameter and 42 outer diameter, and the length is 24CM
                  I will build in the near future, and I will continue to share pictures with you
                  I was thinking of making a slot ported sub using this driver as per the attached but the down-firing design is interesting alternative.Click image for larger version

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                  • #10
                    Wow, your design looks very cool.

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                    • #11
                      Originally posted by rscamp View Post

                      I was thinking of making a slot ported sub using this driver as per the attached but the down-firing design is interesting alternative.Click image for larger version

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                      Um, wow! If you can make stuff like that, I may have to put you to work.
                      Isn't it about time we started answering rhetorical questions?

                      Paul Carmody's DIY Audio Projects
                      Twitter: @undefinition1

                      Comment


                      • #12
                        Originally posted by Paul Carmody View Post

                        Um, wow! If you can make stuff like that, I may have to put you to work.
                        Well, it would certainly be an experiment with the translam approach to a Voxel! I'm trying to decide if it is worth the effort over more standard construction.

                        Timely post, Paul. A bit off-topic, but I was thinking of building a pair of Overnight Sensations but with a different style. Does this variant on the OS look doable without needing modifications to the crossover?
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                        • #13
                          You moved the drivers, so that will have an affect on the frequency response.
                          Wolf
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                          • #14
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