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Old 3rd October 2008, 05:04 AM   #71
hifiZen is offline hifiZen  Canada
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Quote:
Originally posted by mp9
hifizen, how are your re-design plans coming along?

'bout the same as where I was last post, unfortunately. Work continues to press my spare time to the limit, and BAF'08 is looming on the horizon... I have a few things to pull together in advance of that. Just last night, I finally got my F120A's assembled into their little BR boxes. Sounding quite good so far, but they clearly need BSC, which I haven't got to yet. Need to get a rough measurement for that.

I'll try and get back to the A166 plans again this weekend or next.
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Old 3rd October 2008, 05:09 AM   #72
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Quote:
Originally posted by planet10


And if you used it with a woofer, you'd find it could be improved with a WB replacing the co-ax (i'm forcing myself to live with a stock pair ATM -- the self-noise from the cone actually gives these on an OB to sound boxy)

dave
Could you describe what "self noise from the cone" is?
Rubs?
Distortion of some kind?

r
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Old 3rd October 2008, 06:26 AM   #73
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Quote:
Originally posted by serenechaos
Could you describe what "self noise from the cone" is?
When the cone moves the material it is made of makes noise.

dave
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Old 3rd October 2008, 12:21 PM   #74
REC1 is offline REC1  United States
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When the cone moves the material it is made of makes noise.


Tech term: Acoustic Emission.

ron
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Old 3rd October 2008, 01:03 PM   #75
REC1 is offline REC1  United States
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Tech term: Acoustic Emission.

OK so i started thinking (RUT RO). The endless debate on Enable and the total answer was never really finalized.

The Acoustic Emission (AE) of the cone, i dont believe, was ever addressed. This could be the answer. The dots break up the skin emissions that are produced by AE.

Just a thought.

ron
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Old 3rd October 2008, 02:26 PM   #76
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Quote:
Originally posted by planet10
When the cone moves the material it is made of makes noise.

dave
That's on the Highly Hyped Hawthorne OB or auggie/woofer?

Isn't that just an Eminence that he got too impatient for a free enable treatment to test...
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Old 3rd October 2008, 05:04 PM   #77
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Quote:
Originally posted by serenechaos
That's on the Highly Hyped Hawthorne OB
The coax -- i have a customer set. Darryl never did send me a full set, not understanding that the tweeter needs doing too (and it turns out he didn't know that a pro tweeter could be dissassembled to change the dome).

The driver is an assembly custom built out of the Eminence parts bins.

It is a painful process to do a set of these. Mostly because they are so big. But i almost have the customer set done (thank goodness for his patience).

dave
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Old 3rd October 2008, 06:15 PM   #78
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Quote:
Originally posted by planet10

The coax -- i have a customer set. Darryl never did send me a full set, not understanding that the tweeter needs doing too (and it turns out he didn't know that a pro tweeter could be dissassembled to change the dome).
dave
dave:
That's funny, but not suprising...
"Manufactures" whose knowledge base extends to the limits of re-naming, re-labeling and putting products others make in boxes...
I'll try & not go there...

Didn't know you had been treating compression driver domes.
I have a pair of PB850s & a pair of 475s I was thinking of experiimenting with shrinking an enable pattern on...
Are you using the same paint, or something thinner/lighter?

Are you just doing the pattern, or coating them with anything?
(Like aquaplas, etc.)

Or is this proprietary, or should I ask Bud, etc?
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Old 3rd October 2008, 06:45 PM   #79
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Quote:
Originally posted by serenechaos
Didn't know you had been treating compression driver domes.
I have a pair of PB850s & a pair of 475s I was thinking of experiimenting with shrinking an enable pattern on...
Are you using the same paint, or something thinner/lighter?

Are you just doing the pattern, or coating them with anything?
(Like aquaplas, etc.)

Or is this proprietary, or should I ask Bud, etc?
Same paint... i may coat the dome, or just the pattern, will have to listen.

I'm asking Bud so you might as well He says this is the tricky part so his experience is very welcome.

dave
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Old 4th October 2008, 01:09 AM   #80
hifiZen is offline hifiZen  Canada
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I have a question for Ron:

I'm trying to reconcile the horn dimensions to try and recreate the original horn design as accurately as possible. The A166 plans on Planet10's site show two designs. One is the A166 with smooth curves (built up from a laminated stack of CNC cut material). The second part of the plans is for the A166 built the more conventional way with plywood panels, so the curves are broken down into piecewise straight sections. Can you tell me which of the two more accurately represents the correct (simulated design) dimensions? I am assuming it is the curved version.

If my assumption is true, then the version built from flat sections of ply is an approximation of the smoothly curved horn taper... in which case, if I were to overlay the 'exact' curves over the piecewise version, how should the straight sections line up with the overlaid curves? Should the straight sections be tangential to the precise curves, or partly inside / partly outside the circle so that the horn cross-sectional area averages out around the bend?

Perhaps a diagram would help clarify what I mean. I am going to work on the CAD plans some more, to add the curved version. That way I can overlay the drawings and compare. But any hints as to how they should line up relative to one another would be much appreciated!
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