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Acoustic Lens Tests

JasonPJasonP
in DIY

Ran out of time to start measuring but setup is otherwise complete:

Tymphany TC7FD-04 in a monolithic 3d printed wedge enclosure, the test vehicle for the printed len plates. CHECK.
Test plate with no loading. CHECK.
Test plate with a simple plug loading. CHECK.
Bass module - vented MAC-6 in a 7 liter madisound enclosure from when time forgot. CHECK.

measurements in the coming days.

= Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
Steve_LeekenrhodeshifisideSilver1omoNicholas_23jr@macugly_woofer6thplanetsilverDBryan@MAC

Comments

  • jr@macjr@mac

    Fun project, JP. Look forward to your impressions.

    I have a signature.
  • 6thplanet6thplanet

    This should be neat.

  • JasonPJasonP

    First measurement of the no-plug faceplate, which given how small it is, I was surprised to see the rather potent boost it gave from 6k to 15k. Details:

    • 24" distance
    • SPL roughly 90db
    • 0, 22.5, 45, and 60 degrees rotation

    6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    Plug plate glued into place for testing:

    Same measurement conditions, results:

    6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    Can't say that is a winner. but it for sure is having an effect on the loading of the driver from 5k and up.

    6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    On the other hand, crossing over to a tweeter at 5k would make it far more viable and it seems to create a waveguide effect on directivity all the way down.

    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    Now I'll imagine more shapes and see what happens.

    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • 6thplanet6thplanet

    What's going on on the backside of the phase plug?

  • JasonPJasonP

    Its rounded, about 3-4 mm above the cone dust cap.

    6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • hifisidehifiside


    Did you make it so you can screw different shapes on the bridge?

  • JasonPJasonP

    Nope, printing each time, your idea is better!

    hifiside
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    Bottom looks like so, for reference of attempt 1:

    6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    Brad's great idea, very nice! A spot to slot the separate bar/plug into!

    hifisideSilver1omoPWRRYDugly_wooferScottSBryan@MAC
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    New test prints loaded and printing:

    One smaller plug (25mm diameter to 20mm and less depth) plus a couple other "why not" lens shapes.

    Silver1omotajanes
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • tajanestajanes

    Will you be able to try the new smaller plug in both directions (point in as well as outward) ?

    JasonP
  • WolfWolf

    Good suggestion!

    InDIYana Event Website

    Wolfy's Photobucket

  • JasonPJasonP

    Yes, that should be easily done, good idea

    hifiside
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • JasonPJasonP

    So when taking apart the current plate and attempting to pull out the driver I kind of forgot how much I glued the wire into the back and uh, that was that - oops!

    Well at least I have 7 more of these drivers in a drawer in the closet (torn out of the MMTMMW build I brought to Indy ages ago). So I have that going for me, which is nice.

    Also, since this is getting for serious, I'll make a more robust box!

    A slight pause on measurements though, while I get this all together.

    ugly_woofer6thplanet
    = Howard Stark: "This is the key to the future. I'm limited by the technology of my time, but one day you'll figure this out."
  • PWRRYDPWRRYD

    @JasonP said:
    So I have that going for me, which is nice.

    Carl FTW!

    JasonPugly_wooferSteve_Lee
  • jhollanderjhollander

    I wish I could find my article on acoustic lens/ phase plugs. I was all about making the on axis response look as good as the off axis iirc.

     John H, btw forum has decided I don't get emails
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