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Old 6th August 2015, 12:05 AM   #1
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Default Wide range box

I am in the process of building this. The driver has minimal specs to derive a design for. The wood is ponderosa pine. I have minimal testing equipment to spec the driver myself. When I get time to complete the speakers I will report back. Any critiques are welcome.
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File Type: jpg americana ponderosa 1.jpg (258.8 KB, 321 views)
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Old 6th August 2015, 04:23 PM   #2
GM is offline GM  United States
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Greets!

Not enough info to critique and about all I know is that for decades the standard box for an 8" PA driver was [still is?] 2 ft^3 sealed, so around 4.5 ft^3 vented.

Anyway, having used many RS and similar drivers way back when, though not this series, I'm curious how it turns out as I've had good luck loading them in acoustically large tower alignments [aka MLTL and its tapered variants] knowing only their Fs.

GM
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Old 7th August 2015, 01:42 AM   #3
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I have a sketchup file. How do you attach one? The attachment app here said invalid file.Height of speaker will be 48".Width 11 1/8". Speaker centerline at 38".One quarter of the length of line will go up and turn into a stub.The other will go down and turn into second chamber. Then up ,turn and out on the same height as speaker. Much easier to see than describe in words. A modified transmission line in less words.
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Old 7th August 2015, 09:24 AM   #4
xrk971 is offline xrk971  United States
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Convert file to either .jpg, .png, or .pdf and upload. Needs to be under 763k in size. Other file types allowed, look in the notes at the bottom of the upload pop-up for valid file types.
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Old 7th August 2015, 07:21 PM   #5
freddi is offline freddi  United States
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that's a very pretty Utah Celesta variant
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Old 7th August 2015, 07:25 PM   #6
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Here are the pictures.
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File Type: jpg Americana back.jpg (64.2 KB, 210 views)
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Old 7th August 2015, 10:12 PM   #7
GM is offline GM  United States
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Quote:
Originally Posted by freddi View Post
that's a very pretty Utah Celesta variant
Thanks! I couldn't remember what the RS driver actually was. I have one set of 8" Celesta [C8JC-3A] specs measured in '72 and while the ~26 L Vas and ~1.0 Qts is about what I expected, a 72 Hz Fs is too high based on published specs, though about right for the 'default' 2 ft^3 sealed PA box, so makes me wonder. A nearly 5.0 mH Le and 0.6 mm Xmax was a real 'eye opener' too.

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Old 7th August 2015, 11:27 PM   #8
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Thanks GM for the specs.The length of the stub is 17 5/16". The length out the back is 72". Exit port/slot will be 9 1/2" by 3 1/2".Total volume is 5.334 liters or 325.5 cubic inches. I do not yet have all the tools for wood working. I am using the pine boards so cuts are minimal. If/when I get a table saw plywood will be used. This is my first box.Thanks again.
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Old 8th August 2015, 01:08 AM   #9
freddi is offline freddi  United States
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I had the 12" with tweeter Celestas about 50 years ago with an Eico ST40 - still remember the sound on the first play of Audio Fidelity's "Opera Marches"
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Old 8th August 2015, 04:44 AM   #10
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Quote:
Originally Posted by Katalyst View Post
Thanks GM for the specs.The length of the stub is 17 5/16". The length out the back is 72". Exit port/slot will be 9 1/2" by 3 1/2".Total volume is 5.334 liters or 325.5 cubic inches. I do not yet have all the tools for wood working. I am using the pine boards so cuts are minimal. If/when I get a table saw plywood will be used. This is my first box.Thanks again.
You're welcome, though with such old drivers, they may be useless, especially if they haven't been used and/or subjected to high heat for extended periods.

Not quite sure what sort of alignment you're building and the drawings unfortunately aren't helping much, so curious how you arrived at it, especially since they seem to be implying two separate vented systems.

What is only 5.334 L? The rest of the line dimensions?

GM
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