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Old 1st February 2013, 03:29 PM   #1181
xrk971 is online now xrk971  United States
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Ravener,
Looks good. What is your reason for having the back throat leading to a spiral that goes to a closed end? Are you trying to locate the driver at a location that essentially makes the horn appear longer by having an offset driver chamber between a closed end and an open end? What is your total path length by the way? One final note, if foam core boards come in the 20x30 in size where you are (probably not as you are in Singapore), reducing the 21 in dimension to 20 in allows you to fit it on shorter length of raw stock.
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Old 1st February 2013, 03:35 PM   #1182
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by ravener View Post
Tweaked the design a little, made the compression chamber rounder and the throat tighter.

fh = (342 x 0.00194m^2) / (2 * 3.142 * 0.00050m^3) = 210Hz

Seems rather reasonable...

Shall be starting work using this.

edit: upon looking at tractrix horns... mine seemed like an asymmetric curved tractrix...
Check this out from Paul Pino the foam plate speaker guy: Spinning Nautilus Speaker - YouTube
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Old 1st February 2013, 03:48 PM   #1183
IG81 is offline IG81  Canada
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Originally Posted by IG81 View Post
You might glean some useful bits from the old Bruce Edgar article:




I ought to go through it again myself.

IG
Ugh - forgot to post the link...

http://volvotreter.de/downloads/Edgar-Midrange-Horn.pdf

IG
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Old 1st February 2013, 04:25 PM   #1184
ravener is offline ravener  Singapore
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X,

Nothing too complicated actually, I just don't want to change the shape of the Fibonacci spiral by too much, thereby tapering off the other end rather than remove it altogether, may be hoping that the closed end would act like a transmission line?

Anyway, the drivers that i'll be using looks strangely similar to this one The Madisound Speaker Store
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Old 1st February 2013, 04:31 PM   #1185
xrk971 is online now xrk971  United States
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If the Vifa TC6FD is anything like its big brother the TC9FD, you are in good hands. I have been meaning to buy a couple of these to try in my 14 inch Cornu. Looking forward to seeing your build and hearing your listening impressions.
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Old 1st February 2013, 04:43 PM   #1186
xrk971 is online now xrk971  United States
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IG,
Thanks for the link - just what I was looking for! Looks like a perfectly fun thing to make out of foam core.
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Old 1st February 2013, 04:44 PM   #1187
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Quote:
Originally Posted by xrk971 View Post
There is a deal on a 3 in full range driver with high Qts at Madisound for $2. Aurasound NS3 16 ohm neodymium driver I think.
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Originally Posted by xrk971 View Post
Here is the link to the NS3 driver I was talking about.
The Madisound Speaker Store
I wonder if that's a typo. The $2 driver I have is the AS3

Aura Sound 3" Full Range Speaker 16ohm 7 5 Watt 135Hz Neodymium Magnet Aurasound | eBay

this is the real NS3.

The Madisound Speaker Store
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Old 1st February 2013, 04:48 PM   #1188
xrk971 is online now xrk971  United States
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Originally Posted by Cal Weldon View Post
I wonder if that's a typo. The $2 driver I have is the AS3

Aura Sound 3" Full Range Speaker 16ohm 7 5 Watt 135Hz Neodymium Magnet Aurasound | eBay

this is the real NS3.

The Madisound Speaker Store
I am talking about this one, I think it is what you got Cal.
The Madisound Speaker Store

Price went up to $2.50 ea.
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Old 1st February 2013, 05:33 PM   #1189
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OK, I wonder if the difference is simply alnico - A and neo - N. They appear the be similar otherwise. I seem to have the A version.
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Old 1st February 2013, 06:24 PM   #1190
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Price went up to $2.50 ea.
Likey because enuff people bought boxes of 50 (i bought 100) that they have less than 50 left.

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