Collaborative Tapped horn project - Page 387 - diyAudio
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Old 3rd October 2012, 12:08 AM   #3861
tinitus is offline tinitus  Europe
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thiele small specs

looking at a big PA woofer
it clearly says 22hz ressonance
and graph shows it too, or close

but its listed with 34hz Fs in thiele small specs for box calculation

why is that
or is 'just' to be conservative and avoid failure ?
meaning it could be calculated using the 22hz ?
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Old 3rd October 2012, 12:24 AM   #3862
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Quote:
Originally Posted by tinitus View Post
thiele small specs

looking at a big PA woofer
it clearly says 22hz ressonance
and graph shows it too, or close

but its listed with 34hz Fs in thiele small specs for box calculation

why is that
or is 'just' to be conservative and avoid failure ?
meaning it could be calculated using the 22hz ?
An inaccurate Fs figure is more likely to make a speaker/cabinet alignment failure prone.
A speaker with a 34 Hz Fs can be put in a box with a 22 Hz Fb or Fc.
By "22hz ressonance" do you mean Fb or FC?
Pictures of what you write about would be helpful.
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Old 3rd October 2012, 07:07 AM   #3863
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by weltersys View Post
An inaccurate Fs figure is more likely to .....

By "22hz ressonance" do you mean Fb or FC?
Pictures of what you write about would be helpful.
its the new Precision Devices PD.1851

22hz ressonance is clearly the ressonance peak
but they still use 34hz for thiele small Fs
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Old 3rd October 2012, 11:03 AM   #3864
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by tinitus View Post
its the new Precision Devices PD.1851

22hz ressonance is clearly the ressonance peak
but they still use 34hz for thiele small Fs
Hi tinitus,

If you place Your 'hand' at the smallish FR or on the impedance graph you will realize that 22Hz is the PD 2150 fs and not for the PD 1851.

b
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Old 3rd October 2012, 01:47 PM   #3865
tinitus is offline tinitus  Europe
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shoot, you are right
specs shown on the new PD.1851 clearly says PD.2150
weird mistake, but its a new site layout

ok, thanks
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Old 3rd October 2012, 03:21 PM   #3866
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Quote:
Originally Posted by Skiivari View Post
Just a few pages back, bjorno's version. Collaborative Tapped horn project

definately not getting into the low 20's with this much stuffing (or leakage)
musically I'm really happy, it sounds good and my mains can't keep up

I see your design has something in common with mine, car audio driver in a tqwt
Based on the 25hz tuning and recommended 25hz/24db filter, you're not going to get low 20's. Nice response for such a short length ttqwt!

Yes it does. I love it! I have no stuffing or highpass filter. It's a beast! I designed it for 1, 000 watts but only putting about 200-250 to from a Yamaha htr running in subwoofer mode from a Sony htr. D@mn thing has cracked multiple walls in the house.
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Old 11th February 2013, 10:50 AM   #3867
tinitus is offline tinitus  Europe
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looking at a woofer

http://www.lautsprechershop.de/pdf/m...320hc_data.pdf


for mounting woofer, I thought if most of the whole side could be removed to do that, it would also be possible to 'adjust' the last horn path and opening by changing this baffle part

anyone tried to make lots of smaller holes close to opening, like the did in the older days to achieve apperiodic system, or slits, slots, or whatever ?
well, anyway, if that baffle part is made detachable it would make experimets possible
Attached Images
File Type: jpg mivoc_xaw320hc_gross.jpg (81.1 KB, 221 views)
File Type: png tapped 3.png (10.6 KB, 221 views)
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Old 11th February 2013, 12:36 PM   #3868
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Originally Posted by tinitus View Post
Anyone tried to make lots of smaller holes close to opening, like the did in the older days to achieve apperiodic system, or slits, slots, or whatever ?
well, anyway, if that baffle part is made detachable it would make experimets possible
What you sketched and described Looks exactly like Art Welters Keystone TH Cabinet.
Keystone Sub Using 18,15,&12 Inch Speakers
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Old 11th February 2013, 03:23 PM   #3869
tinitus is offline tinitus  Europe
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great, thanks

ok, because of its 'cubic' size, it may in reality need another folding, and end more like this

are there any 'average' rules about needed volume in liter, that could tell me about estimated size ?
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File Type: png tapped 4.png (11.9 KB, 202 views)
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Old 11th February 2013, 03:44 PM   #3870
epa is offline epa  Netherlands
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if one uses 18mm ply ad 25 to 35% to the simulated value.
the more folds the model has the more "unused/not simulated" corners it has.ie in your last example it wil be closer to 35%
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