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Did Siegfried Linkwitz miss a trick?
Did Siegfried Linkwitz miss a trick?
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Old 20th October 2020, 04:50 PM   #41
xrk971 is offline xrk971  United States
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Did Siegfried Linkwitz miss a trick?
Quote:
Originally Posted by jjasniew View Post
They have these 12" beach tires on ebay, $50 - $75 a piece.
What’s in the middle of it and if you take out the central wheel, is it all soft and floppy since it doesn’t hold air?

The $100 stainless steel 12in donut seems only a little more but more rigid.
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Old 20th October 2020, 06:42 PM   #42
scottjoplin is offline scottjoplin  Wales
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Vituixcad?
Is that where your avatar is from?
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Old 20th October 2020, 06:59 PM   #43
Juhazi is offline Juhazi  Finland
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^No, it's from Dayton OmniMic unregistered test version. I exported REW measurements. I'm too dumb and lazy to learn Vituixcad, sorry!

I searched for my measurements of nude cone's backside, but couldn't find any. They were so ugly that I didn't save them!

One more Edge sim, dipole vs. monopole baffle
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Last edited by Juhazi; 20th October 2020 at 07:19 PM.
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Old 20th October 2020, 07:17 PM   #44
scottjoplin is offline scottjoplin  Wales
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Oh well A mock up would probably be the simplest to see whether there's actually anything in this. I think member jameshillj is keen to give it a try
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Old 20th October 2020, 07:30 PM   #45
xrk971 is offline xrk971  United States
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Did Siegfried Linkwitz miss a trick?
6in inside dia and 13in OD. Wheelbarrow inner tube.

AR-PRO 13 x 4.00-6'' Heavy Duty Replacement Inner Tube with TR-13 Straight Valve Stem (4-Pack) - for Wheelbarrows, Mowers, Hand Trucks and More https://www.amazon.com/dp/B0819D842F...ing=UTF8&psc=1
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Old 20th October 2020, 07:47 PM   #46
scottjoplin is offline scottjoplin  Wales
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It could be used deflated for comparison
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Old 20th October 2020, 09:41 PM   #47
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Quote:
Originally Posted by scottjoplin View Post
Take a look at figure d below, from here Electro-acoustic models
Dunno about SL, but as I alluded to here, I designed a rectangular one using horn theory decades ago now on a long gone forum, so round is in theory even a better solution, but at the time 'we' didn't think the extra woodworking would yield enough audible improvement: Torus

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Old 20th October 2020, 09:49 PM   #48
GM is offline GM  United States
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Originally Posted by xrk971 View Post
6in inside dia and 13in OD. Wheelbarrow inner tube.
Right, 'we' initially discussed using the biggest inner tube available in Costa Rica, which turned out to be not large enough to go as low as he wanted, but could get down into the mid-bass here in the USA.

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Old 21st October 2020, 08:25 PM   #49
DonVK is offline DonVK  Canada
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Like this...
.
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Old 21st October 2020, 09:11 PM   #50
xrk971 is offline xrk971  United States
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Did Siegfried Linkwitz miss a trick?
Nice work DonVK! Can you show an on axis frequency response plot? Just wondering if there is a cancellation dip from the front to back round trip.
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