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Old 19th February 2013, 11:56 PM   #1341
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Quote:
Originally Posted by xrk971 View Post
Cogitech,
Here is the OSB horn thread. MJK's Fostex FF125wk BLH project
Cheers!
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Old 20th February 2013, 01:08 AM   #1342
guangui is offline guangui  Puerto Rico
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uFonken Paint.JPG
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Originally Posted by xrk971 View Post
The after is nice looking - what kind of finish is that? How do they sound?
They don't sound too good, as the drivers have not arrived. I ordered Tang Band W3-1364SA for them, but they will start shipping tomorrow. I also ordered TB W3-881SI to try them out. These enclosures were designed by Planet 10 for Fostex FF85WK, but those are will not be available until mid-March; I will order then. I have other projects pending where I can use the drivers that "don't make the cut".

As for the finish, textured stone spray paint did the trick (see attached photo). I would have chosen something else, but I had 1/2 a can unused that I purchased to do some custom electrical switch plates my wife's decorator came up with. My wife and the decorator are experts at coming up with great ideas that no one sells or has, and I have to end up figuring out how to make them and/or install.

Last edited by guangui; 20th February 2013 at 01:14 AM.
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Old 20th February 2013, 08:55 AM   #1343
xrk971 is offline xrk971  United States
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Originally Posted by KLBIrd View Post
In the famous Stromberg-Carlson Acoustic labyrinth or, transmission line, of the 1930s, the tunnel was made of heavy cardboard with felt damping. The radios sold from $300 to $900 and were the high end audio of the day. So we learn that they did it first, and if foam had been available, they would have no doubt used it also.
Interesting stuff Ken. Have you ever had a chance to listen to one of the cardboard radios? Predecessor to the hugely successful Bose Wave Radio? A foam core Bose-beater is another project that I have been thinking of using a spiral channel. Easy to beat the sound as they use mediocre 2 in drivers and a crappy amp with 10% THD at something like 5 watts. I would increase driver dia to 2.5 in maybe 3 in and use a TPA3110 amp board or even a TPA3122 to get clean 15 watts.
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Old 20th February 2013, 11:30 AM   #1344
KLBIrd is offline KLBIrd  United States
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Yes I heard one once at an old time radio convention in Chicago It had great bass but no highs, as most of those radios cut off a 5000 KHz or less. The Bose systems rely heavily on their proprietary equalization circuits. If you connect one to a regular amp it sounds very thin. I was with a major audio firm in Chicago years ago and we had a sign in engineering that read-BOSE, NO Highs, NO Lows!
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Old 21st February 2013, 10:21 AM   #1345
xrk971 is offline xrk971  United States
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It just goes to show that one can become a billionaire selling mid range output speaker systems with good marketing Seriously, what does the proprietary equalization circuit do that we can't do with a PC based equalizer? It is not quite advanced as a DSP based system is it? There is stuff like generating artificial phantom bass using harmonics corresponding to lower bass notes but I don't think that was what the Wave radio was doing, was it?
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Old 21st February 2013, 10:23 AM   #1346
xrk971 is offline xrk971  United States
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Originally Posted by bcmbob View Post
I actually built one with wood back in the 60s. (Just the bottom). When I plugged it in, it blew the door to my daughters bedroom wide open. Just used a cheap generic driver and never could afford the top end horn (student w/ two little ones). Might try again this summer with foam.

When I brought this one home the WAF said
"No Way" , grabbed the kids and left for her mothers house.
Where did you get this photo? Is that real?
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Old 21st February 2013, 11:17 AM   #1347
bcmbob is offline bcmbob  United States
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xrk,

I had the same question. Since I had already gone over the edge with my Klisphorn references, I was doing a search for the JBL Paragon as another extreme horn design. That image came up but I couldn't discover any more information. I vaguely remember a reference in a book but can't find it now.

As far as I can see "largest" woofer returns two items:

Worlds Largest Driver

Worlds Largest Woofer
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Old 21st February 2013, 11:36 AM   #1348
KLBIrd is offline KLBIrd  United States
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Here is my venture into the world of foam enclosures. Its the Admiral 1970s Tunnel Reflex also known as the Bull Horn. I was in engineering at the time and we had to get a license from General Dynamics to use the design. They had bought Stromberg-Carlson and owned the labyrinth patents. The tunnel is lined with 1/2" blanket batting and is not to be stuffed as the tunnel has to be open all the way. I will use a Visaton FR 10 and take some measurements.
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Old 21st February 2013, 12:19 PM   #1349
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Quote:
Originally Posted by xrk971 View Post
A foam core Bose-beater is another project that I have been thinking of using a spiral channel. Easy to beat the sound as they use mediocre 2 in drivers and a crappy amp with 10% THD at something like 5 watts. I would increase driver dia to 2.5 in maybe 3 in and use a TPA3110 amp board or even a TPA3122 to get clean 15 watts.
This is scary
But I have been thinking in the same trail (?), but I never though to use foam board so my project come to a halt.
This is what I have in the project box for this one...

Amp I have two so I can use
Click the image to open in full size.

Active crossover, something like this.. have to recalculate values of cause
Click the image to open in full size.

And a bass boost circuit
Click the image to open in full size.

Media player, has some pre set EQ modes, excellent
Click the image to open in full size.

Bluetooth for iPhone
Click the image to open in full size.

Speakers, Peerless 2,5" (830985)
Click the image to open in full size.
and Dayton ND20FB
Click the image to open in full size.

Only the "box" is missing, but it should be easy to do something with Foam bord... Now I know what to do after midnight the coming weekend..

Bellow is the some pictures I have found on the Wave..

\M
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Old 21st February 2013, 04:22 PM   #1350
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Originally Posted by KLBIrd View Post
Admiral 1970s Tunnel Reflex
I have burned and awful lot of real Tunnel Reflex boxes. I'd never think of building one. Thy came lined with 3/8" felt on all the panels, and get better if you add stuffing.

BTW, if you find a real pair used, they cost about the same as the foam core to build a set, and come with FE103A.

Transmission Line Speakers

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