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Old 28th January 2009, 04:31 PM   #2841
FlipC is offline FlipC  United States
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But are the corrected #'s only for a true isobaric push pull type
where the shared chamber is closed?
Or would they stand for the SPUD loading type as well?

Makes me wonder about other
possible dual driver alignments. I could see some dual 10" and 12" possibilities for PA work.
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Old 28th January 2009, 05:35 PM   #2842
tinitus is offline tinitus  Europe
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Quote:
Originally posted by FlipC
Since I suck with Akabak can someone post a script for Tinituses fisrt pic there
Click the image to open in full size.
Hi flipc

See post 2821 and 2823 by tb46/Oliver where he shows nice drawings of spud with both CSS TRIO8 and TB W8740

With same drivers you should be able to convert those taper lines into any other design you want


Heres another one

btw, those graphs of pushpull looks very promising, but I suppose they are still simulation
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File Type: jpg tapped twin mod.jpg (17.7 KB, 587 views)
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Old 28th January 2009, 05:57 PM   #2843
FlipC is offline FlipC  United States
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yes but I suck at Akabak!
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Old 28th January 2009, 06:14 PM   #2844
tinitus is offline tinitus  Europe
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Quote:
Originally posted by FlipC
yes but I suck at Akabak!

I think you missed it

With use of the nice layout from Oliver the conversion to another design is a "mechanical" job
Might be tricky though, to make it fit the new design
But draw it on big piece of cardboard and it should be possible
About acuracy
Well, I reckon no layout is 100% accurate

Heres another version
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File Type: jpg tapped floor.jpg (17.5 KB, 580 views)
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Old 28th January 2009, 06:24 PM   #2845
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Tinitus: can I ask you what you feel is the difference in having two drivers load a single section of line as in the Spud as opposed to your suggested loading scheme where the two drivers are seperated by a short length of line? Either way the two drivers couple to one another. The only difference that I can see is a slight tme delay one way Vs the other. I love your ideas and thinking in and out of the box so don't take this as a negative. I think that the closer and more intimately the drivers interact with one another the better to cancel out nonlinear distortion. Keep up the great posts. Regards Moray James.
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Old 28th January 2009, 07:13 PM   #2846
tinitus is offline tinitus  Europe
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Thank you James

To be honest I do have serious doubts about doing it the way I showed, with seperating drivers at throath
Thats why I hoped fore response like yours

I was just interested in investigating whether there were any possible options, in case it showed to have any advantage

Anyway, all my suggestions could be done without the seperating baffle at throath, just leave it out if you like

I will hereby finally rest my case of having concerns about whether drivers are stressing each other under heavy load, with possible risk of ressonant distortion

Fore one, theres a huge advantage of each woofer doing half the work
If woofers have very powerfull "motor" there should be no problem
If amps have plenty of power to control the woofer there should be no problem
And pushpull theory/simulation may actually work as intended, in real life too

The first tapped I will build is a center mono fore low SPL listening, and a single woofer of good quality should do very nice, but could very well be the spud/TRIO8, thanks to Oliver

The big ones will be in a few years, and lots of interesting things may happen untill then
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Old 29th January 2009, 02:24 AM   #2847
tinitus is offline tinitus  Europe
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"Heres to you kiddo"

Pushpull with common loading

Features a spiral with mostly angular joints

And with profiled lists to give the illusion of "doors" it would look like a piece of furniture...might make the lady happy

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File Type: jpg tapped spiral.jpg (20.2 KB, 546 views)
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Old 29th January 2009, 03:19 AM   #2848
aceinc is offline aceinc  United States
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OK, I have ordered a pair of Trio-8's from Meniscus Audio. They seem like nice chaps, at least they listened to me blather on without trying to get me off the phone.

They won't be here until next week sometime. Over the weekend I'll try to get making sawdust. I will build the TH-Spud based on the plans located here.

Any thoughts on whether to and what to line the labyrinth with? I was thinking the wool type stuff they use under area rugs. Unless I use screws I will only get one chance to treat the interior of the horn.

I am torn between birch ply ($49 sheet) and MDF ($23 a sheet). I'll probably go birch, cause it's lighter. My thought is to have Home Depot cut the side panels to size, and cut a second sheet into 4 - 48" x 11" and 5 - 48" x 9-9/16" strips.

I was going to draw the plans on one of the sides and use a protractor to measure the angles so that I can cut them as accurately as possible.

This is purely an academic exercise, in that I don't really have WAF acceptable place to put this. So I will build it, test it, play with it as much as possible, and then give it to an associate.

I have a large open front yard (about 350' x 200'), and if I can get some help I might try my own personal sub shoot out. I have a rythmik DS15, a couple of Titanic 10" in sealed cabinets and a 12" dayton DVC in a ported cabinet.

My thought is to run an extension cord to the middle of the yard put down a sheet of plywood, get my notebook running Room EQ Wizard, and see what each sub does. Not real scientific, but there might be some useful information gained. Unfortunately no one in the family has a desire to help with this sort of thing, but I might entice some associates to help.

Paul
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Old 29th January 2009, 04:32 AM   #2849
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G'day Paul

It would be great if someone in your area has a pair of the Tang Band drivers available for testing. This driver looks like a good bet in that box.

"Egg Shell" type foam would be fine down the line, with perhaps polyester wadding or felt used directly around the drivers. Don't block the path, this will decrease sensitivity a lot.

Thanks in advance for the effort. So few people are actually making saw dust, most are just speculating.

Cheers

William Cowan
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Old 29th January 2009, 05:29 AM   #2850
tinitus is offline tinitus  Europe
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Quote:
Originally posted by cowanaudio
G'day Paul

most are just speculating.

Cheers

William Cowan

The TB is 121 mm in depth

The TRIO8 is 90 mm

A big difference of 30mm might be convenient when doing pushpull

Especially when thspud seem to have a troath of about 100mm

Just speculating

No offence Cowan, just kidding
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