Blending controlled directivity treble with dipole midrange? - Page 2 - diyAudio
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Old 14th September 2005, 01:38 AM   #11
AJinFLA is offline AJinFLA  United States
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Since I have never heard Dr Geddes speakers, I have no clue whats better, or best,etc. I can only say I like mine. Designed for my room. Thats good enough for me . I do follow his work however. Good stuff.

cheers,

AJ

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Old 14th September 2005, 03:41 AM   #12
MBK is offline MBK  Singapore
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Well since y'all show yours, ...
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Old 15th September 2005, 07:10 PM   #13
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Originally posted by Paul W
This one used the "gradual transition from dipole to monopole" approach by rolling off the backwave with a thick felt filter across the rear of the baffle. I liked the result a lot...but I also think none of us has found the "magic bullet" for every environment.

MDF is cheap, and drivers reusable, so start trying your ideas!

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Isn't lobing a problem with that kind of design?
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Old 15th September 2005, 09:17 PM   #14
Paul W is offline Paul W  United States
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Not sure if I'm answering the right question...but increased vertical directivity (restricted radiation) was but one of the objectives with the symetrical array. That worked except for bass (longer wavelength) and above tweeter xo. Or are you asking something about the backwave?
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Old 15th September 2005, 09:23 PM   #15
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At certain vertical angles off-axis, there'll be dips in the response because the sound from paired drivers won't be in phase.
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Old 15th September 2005, 10:10 PM   #16
Paul W is offline Paul W  United States
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Yes, you are correct. That was one of the tradeoffs vs 2X power handling, reduced excursion/distortion, reduced floor and ceiling bounce. The successor version is smoother. (Note drivers really are reusable )

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Old 15th September 2005, 10:18 PM   #17
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Another tradeoff is the very high driver cost.
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Old 15th September 2005, 10:59 PM   #18
Paul W is offline Paul W  United States
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Very true...

Eventually they will all be reused. Next up is a set of floorstanding surrounds with the W22s and smaller ribbons. Then probably the D76s with 7" Revs from an earlier project etc, etc...

I keep telling myself drivers are an investment.
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Old 15th September 2005, 11:23 PM   #19
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They don't depreciate (if you keep them), but they sure don't appreciate.
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Old 16th September 2005, 01:12 AM   #20
AJinFLA is offline AJinFLA  United States
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Quote:
They don't depreciate (if you keep them), but they sure don't appreciate.
Well, unless they are Tannoy Golds or Reds or......

http://cgi.ebay.com/TANNOY-Rare-Pair...QQcmdZViewItem

Cheers,

AJ
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