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My 20-20 Indy theme project

edited January 25 in DIY
To date I have designed and built two hybrid open baffle projects.  The first one was a simple two way with a ND105-4 in a ported enclosure and a single TC9FD above on the open portion of the common baffle.  I loved how that little project sounded and it received lots of positive comments from folks that heard it at DDIY and Iowa.  After that I upped the game a bit with a three way design using a NE225W-04 woofer in a ported bass bin with a separate open baffle sitting on top.  That open baffle had a Tang Band W4-1320SIF woofer for mids and a Beston RT002A-bipolar tweeter.  I really liked that project but I didn't feel that the dipole tweeter added all that much.  In fact it forced a crossover point that was a bit compromised  :(  A couple of you heard this project in Iowa two years ago.  Unfortunately it was the last project to play on Saturday and many folks were either already gone or busy carting out their projects.

Anyway, fast forward to now...  The theme build for Indy this year is 20-20.  A purrrrfect excuse to try and step up my hybrid open baffle journey another notch :)

For this design I have chosen to invest a significantly larger portion of the allotted budget towards the mid driver and the tweeter.  For the bottom end I am using a 2 cubic foot bass bin on each side that uses two MCM 55-5670 8" woofers, in a push-pull configuration, wired in parallel for a 4 ohm load.  In my opinion these are fantastic performing woofers considering their low cost.  Their regular sale price is only $39 each.  I bought mine when they were on sale for $26 each.  SCORE!

I think I've nailed down the mid and tweeter for this design, but I'll wait to share their details until I've built a prototype baffle, taken some real measurements, and simulated a crossover design.

So why not, here are a couple of pictures of one of the unfinished bass bins with a mock cardboard baffle sitting on top:



Wait, what???  Two cubic feet and I only see one 8" woofer???

Peek-A-Boo, here's the other one on the backside, in a recessed cavity so the magnet/frame doesn't stick out visually:


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Comments

  • Interested in how those compare to the rs225. 
  • That recessed woofer is a cool idea.
     John H, thanks to JP I did get that email
  • I used that TB 4 incher in a MTM with a NeoCD 3.0 ribbon and a wide roundover kerfed baffle like yours. Closed box. 
    Extremely smooth on and off axis response. I'm very happy with the result. 
    Don, Donno, or "Hey you" all work for me, But never "Mr Johnson"
  • edited January 26
    I love that TB W4-1320SIF!   I'm hoping I like my OB mid choice just as much or even more.  It's a 5" with a lower Fs and higher sensitivity so hopefully it will have a bit more umph.
  • Uh oh, I am using the same combination of 4"TB and Beston dipole for my OB..... Hmmmm.... Too late to change anything now....
  • Very interesting...push-pull woofers. I'm guessing you mean the one on the back is pushing out, to it's magnet, while the other is pushing forward? The inset rear woofer is a cool idea.

    * Do I spy a vintage Marantz receiver on the floor?


  • Tom_S said:
    Very interesting...push-pull woofers. I'm guessing you mean the one on the back is pushing out, to it's magnet, while the other is pushing forward? The inset rear woofer is a cool idea.

    * Do I spy a vintage Marantz receiver on the floor?


    Yes.

    And yes, a model 2230.  I am going to repair it and recap it for a friend.
  • Why not just flip the speaker around so it faces outward on the back, instead of building a crevice to hide the frame and motor?
    I'm not deaf, I'm just not listening.
  • It wouldn't be a push-pull design and gain the advantages of non-linear suspension travel cancellations.
  • edited January 28
    ...and it's cool to see zee motor assembly.  B)
    My buddy, Adam did this to his towers...

    R-CarpenterkenrhodesGowaPWRRYD4thtrysquamishdroc
  • Those look awesome!
    R-Carpenter
  • Not only do they look awesome, they sound awesome too! Adam has some skillz!
  • Yeah, those are really something! IIRC they were crowd favorite at MWAF.
  • 6thplanet said:
    ...and it's cool to see zee motor assembly.  B)
    My buddy, Adam did this to his towers...

    Is Adam on this forum?  If not, you really need to invite/encourage him to join.

    Are those Viawave ribbons?
  • Yes- he won crowd fave. He SHOULD have won the 200+ class as well.
    Adam isn't on the forums much. He keeps a low social media footprint methinks. I think he'd get along here.
    Yes- Viawave 850.
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