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CBT project

ugly_wooferugly_woofer
in DIY

This will be a slow long term project that I will be working on sporadically in between other projects and life's other necessities. The plan is to utilize 18 CSS LD25 tweeters and 18 Dayton DMA80-8 mids per side as well as two Dayton LS10 flat woofers back to back on the sides.

PWRRYDBillet6thplanethifisideDanP4thtry

Comments

  • ugly_wooferugly_woofer

    This will be the basic shape.

    PWRRYDkenrhodesBillettajanesTom_SjhaiderGeoffMillarrjj45Eggguyjr@macand 3 others.
  • Steve_LeeSteve_Lee

    Bookmarked/Subscribed - this should be interesting . . .

  • rjj45rjj45

    Built one a few years ago. Lots of construction challenges! Have fun!

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • 6thplanet6thplanet

    Is the front curve random or a certain radius as per a CBT standard?
    Asking as I really have no clue if that's even a thing.

  • rjj45rjj45

    @6thplanet said:
    Is the front curve random or a certain radius as per a CBT standard?
    Asking as I really have no clue if that's even a thing.

    Yes, the front curve is always a portion of a perfect circle. The length is determined by the diameter of each driver and the space between each driver.

    PWRRYD
    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • PWRRYDPWRRYD

    I'm sure Nick will nail this design. He might be an ugly_woofer but he has mad speaker skills!

    Ed_Perkinsugly_woofertajanesTom_S
  • kenrhodeskenrhodes

    I can't wait to see how he does the grill on these.

    ugly_woofertajanes
  • EggguyEggguy

    I wonder if a guy could devise a way that one person could move a speaker such as these?

  • DanPDanP

    @Eggguy said:
    I wonder if a guy could devise a way that one person could move a speaker such as these?

    Two thoughts, and hear me out here:
    1. Shape it like an egg.
    2. Give it a handle.
    Bam! Problem solved!

    Wolfugly_wooferkenrhodesEggguy
  • DanPDanP

    @ugly_woofer said:
    This will be the basic shape.

    That's gonna be bad ass.

    ugly_woofer
  • Steve_LeeSteve_Lee

    DanP said:

    "1. Shape it like an egg.
    2. Give it a handle."

    Egg shaped things can be rolled from place to place in a meandering/eccentric fashion while knocking over objects adjacent the periphery of its path of motion.

    I think wheels with the above suggested handle might be a more suitable method for a single man to transport these items while a married man is likely to never have the need to begin consideration of such a project.

    rjj45
  • 6thplanet6thplanet

    @rjj45 said:

    @6thplanet said:
    Is the front curve random or a certain radius as per a CBT standard?
    Asking as I really have no clue if that's even a thing.

    Yes, the front curve is always a portion of a perfect circle. The length is determined by the diameter of each driver and the space between each driver.

    Ok, so does it matter what radius that circle is?

  • ugly_wooferugly_woofer

    There's a ton of math equations in Don Keele's white papers, but the short answer is yes. The shading, height and angle, all can come into play.

    tajanes6thplanetPWRRYD
  • rjj45rjj45

    I had some personal help from Jim Griffin when I built mine.

    re:
    The radius of the sphere is the question. The radius of the arc can be found by the following:

    First you know the length of the arc section which is the drivers: 54 mm which is 2.126" x 24 = 51.024"
    Add in the gap distance that you choose which is 23 x 0.0625" = 1.4375"
    Add in the distance at the top and bottom of 1" each which totals 2"

    So add 51.024" + 1.4375" + 2" = 54.461" for the total length of the arc which is the front baffle length.

    Now the radius of the sphere is the length of the arc divided by (2 pi x 36/360) for this case. Thus we have: 54.461" / 0.6283 = 86.68" for your case.

    You can also use a piece of graph paper, compass, protractor, and a pencil if you wish to envision what we just did.

    6thplanet
    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • 6thplanet6thplanet

    Cool, thanks🤘🏼

  • ugly_wooferugly_woofer

    I mocked these up in order to get the volume of the subwoofer section. I just use packing peanuts and boxes to fill it then put the contents into a box which is a much simpler calculation to figure.

    tajanes4thtryhifisiderjj45Steve_LeeGowa6thplanet
  • tajanestajanes
    edited February 18

    Very creative way to measure net volume of a non-std box !

    Curious, how did you go about cutting the curved indent track for the back (darker board) ?

    ugly_woofer
  • rjj45rjj45

    Looking good! The weight of the sub will help with stability

    ugly_woofer
    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • ugly_wooferugly_woofer

    @tajanes said:
    Very creative way to measure net volume of a non-std box !

    Curious, how did you go about cutting the curved indent track for the back (darker board) ?

    I just used an auxiliary fence on a router with a 1/4" but an followed the front edge.

    Steve_Leetajanes
  • ugly_wooferugly_woofer

    So I haven't made any progress except buying a couple drivers.

    tajaneshifisideSteve_Leejr@macPWRRYDkenrhodesEggguy6thplanetDanPNicholas_23and 1 other.
  • ugly_wooferugly_woofer

    This happened. Apparently Freud has an issue with 9/32" bits fracturing. I ordered 3 Amana 9/32 bits, they should be here soon.

    Steve_LeeTom_Srjj456thplanetTurn2
  • rjj45rjj45

    I've had some Yonico bits break, but never a Freud or Bosch

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • ugly_wooferugly_woofer

    Problem solved,

    jr@mackenrhodesrjj45hifisideSteve_Lee
  • EggguyEggguy

    I love Amana cutters. WTH happened? It looked like you lost your grip.

  • ugly_wooferugly_woofer

    Nope, just making a light cut, and it broke off. Not even 1/8" deep. I've never had an Amana break, they cost a little more, but it's a quality product.

    EggguySteve_Lee
  • a4eaudioa4eaudio

    I have that same Freud bit. Did you buy a 3-pack of the Amana or just bought three so you'd have extra on hand?

  • ugly_wooferugly_woofer

    I just bought three. I almost always buy supplies in multiples.

    jr@macPWRRYDrjj45Steve_Lee
  • Steve_LeeSteve_Lee

    ^ I share this view - you should see my reloading room and speaker driver closet - or maybe not . . .

    6thplanet
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