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Old 28th December 2006, 11:53 PM   #511
gexter is offline gexter  Canada
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Thats Funny
I have to say I had the same thought. Dave or Chris showed me a picture of a ripple effect awhile ago .
If the dimples make the golf ball fly farther then how would it effect the horn?
I never tried because thats alot of dimples!

But I still wonder.

But I am always wondering and never doing anymore.

Gex
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Old 29th December 2006, 12:52 AM   #512
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Quote:
Originally posted by doorman
Karl: Be sure and post your impressions!
Aren't you currently running Parkers?
Don
Yes, running the Parker 98's, but am ansy to see how I can make these sound, both in my main system with my Select, and also with a t-chip amp for a possible second system. I'm also building them so interested friends may chance to give them a spin.

I think if I really really dig these guys, then it would require ex trannies for my Select or maybe a Taboo for them.

By the time those flat paks are out, you guys will have done all the experimenting and I'll just have to be happy as a me-too builder which is totally ok, as I'm no horn expert.

Yes, I'll post impressions, of course! Especially after all the generous support of you guys on this thread and planet10's effort in being the hub for it.

Karl
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Old 29th December 2006, 01:09 AM   #513
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Quote:
Originally posted by BWRX
I have often wondered how the sound would change if the inside surface of a horn path or a port tube were covered in dimples like on a golf ball.
Golf balls, sharks, submarines, and B&Ws flow ports....

The effective frequency should be dependent on dimple size(s). The cork mentioned earlier would emulate very small dimples. Best i guess would be a size that smooths flow below 200 Hz or so, and messes with it up higher.

dave
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Old 29th December 2006, 01:42 AM   #514
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Quote:
Originally posted by planet10
Best i guess would be a size that smooths flow below 200 Hz or so, and messes with it up higher.
Muffler effect.
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Old 29th December 2006, 02:11 AM   #515
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the back side of the door rear view mirrors on my BMW (the surface facing the front of the car) has the opposite of dimples, it has pimples.
They are very small, at least half the size of the dimple of a golf ball.
I remember reading once that the purpose of the pimples was to lessen wind noise at speed (at what speed / frequency I have no idea).

Any aerodynamic types around to tell us about dimples / pimples?
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Old 29th December 2006, 02:28 AM   #516
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Quote:
Originally posted by Andrewbee
was to lessen wind noise at speed
The antenna on my '95 Chevy S10 has a spiral wrapped around it that is supposed to do the same thing.

dave
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Old 29th December 2006, 03:46 AM   #517
doorman is offline doorman  Canada
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Dave: "At speed"!?
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Old 29th December 2006, 03:55 AM   #518
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Quote:
Originally posted by doorman
Dave: "At speed"!?
Dimples != warp field
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Old 29th December 2006, 03:15 PM   #519
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So this is where the people from the forum where the Frugel Horn thread disappeared went. I was chastised for asking about its disappearance over there...

Again, it sure is nice to have a place where generous people post great designs, and the community can openly discuss theories, experiments (& screw ups).

On horn inner surfaces, I got the french polish idea from Kloss, and was guessing it helped by making the wood surface harder, more refelective?
And I had the same guess previously posted about cork, that it mimicked dimples, a la B&W ports, golf balls, etc.
Wouldn't that work as somewhat of a low-pass filter?
To keep some of the highs out of the horn mouth?
Reminds me of Penske's Trans Am Camaros in the '60s using vinyl tops, supposedly for the same reason.

Robert
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Old 29th December 2006, 06:21 PM   #520
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Robert.

Good to see you havr found your way from the other forum... i guess Steve decided that the offering of flat-paks was too commercial and snipped the thread & my ID sending a lot of useful information into a black hole....

Fortunately, as far as the Frugel-Horn goes, much of it was "backed-up" here & in the FR Forum thread.

dave
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