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Old 19th May 2007, 08:16 PM   #411
freddi is offline freddi  United States
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one more thing - which 12" drivers offer good value and smooth/clear sound? - here's Lab12 sims

45 liter sealed box
http://img82.imageshack.us/img82/418...45lsealom9.gif

4.2M tapped horn
http://img82.imageshack.us/img82/4936/lab1242mlw9.gif

vary horn length
http://img524.imageshack.us/img524/4...2varyl2vb7.gif
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Old 20th May 2007, 08:41 AM   #412
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G'day Freddi

That info is on the bottom of the tapped horn page on my website at http://diy.cowanaudio.com

l2 is simply the distance along the line from the front of the driver to the back of the driver. Those LAB12 sims you show are far from optimal.

Cheers

William Cowan
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Old 20th May 2007, 02:48 PM   #413
freddi is offline freddi  United States
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Hi William --

re:Lab12 - how smooth of a model have you produced and what might one jiggle in the model?

since tapped (and other BLH) exhibit mass loading, is it a good idea to start with a driver whose fs is ~1/2 octave higher than the horn's 1/4 wave?

Best,
Freddy
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Old 20th May 2007, 05:09 PM   #414
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how do you fella's feel bout these drivers for a midbass TH ...

http://www.jblpro.com/pub/components/2206.pdf
http://www.jblpro.com/pages/pub/components/2020h.pdf


or the 2262H found in this,,,,,

http://jblpro.com/products/portables.../vrx932la.html


it has a tiny neodyium magnet and basket for less detsrtuctive interfernece along the path.
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Old 20th May 2007, 05:51 PM   #415
freddi is offline freddi  United States
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guess it depends on goal - 2206 looks like a nice driver - maybe Walt and William will give comments as i don't yet know enough to make truly useful simulations. At some point one would have to decide whether TH is more useful for a situation than FLH and possibly consider a highpass filter.

btw- anyone here have nearfield measurements of their TH's cone? - does it exhibit two excursion dips? - or is one hidden? (IIRC Karlson make different F "near-cone" nulls as mic travels from top of driver to bottom of driver)

FWIW a 3M TH sim with 4 drivers - higher fs is smoothest
http://img70.imageshack.us/img70/2372/3m4drvrmx5.gif
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Old 20th May 2007, 06:50 PM   #416
316a is offline 316a  England
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2206H script , needs a little more work .

Quote:
| JBL 2206H Tapped Horn

Def_Const |Horn Dimensions

{
a1 = 215e-4; |Area at throat (cm^2)
a2 = 220e-4; |Area at rear of driver (cm^2)
a3 = 1840e-4; |Area at front of driver (cm^2)
a4 = 1845e-4; |Area at mouth (cm^2)
l1 = 15e-2; |Distance from throat to rear of driver (cm)
l2 = 340e-2; |Line distance from rear of driver to front of driver (cm)
l3 = 30e-2; |Distance from front of driver to mouth (cm)
}

Def_Driver 'Dr1'

| JBL2206H 8max 8mm 12"

Sd=413cm2
fs=52Hz
Qes=0.34
Qms=4.5
Vas=62L
Re=6.9ohm
Le=1.5mH

system 'S1'

Driver Def='Dr1' Node=1=0=3=4
Waveguide 'W1' Node=2=3 STh={a1} SMo={a2} Len={l1} Conical
Waveguide 'W2' Node=3=4 STh={a2} SMo={a3} Len={l2} Conical
Horn 'H1' Node=4 STh={a3} SMo={a4} Len={l3} Conical
Looks like a good driver with xmax of 8mm .

cheers

316a
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Old 20th May 2007, 07:13 PM   #417
freddi is offline freddi  United States
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hi 316a - good start on 2206 - how are you esitmating throat, flare and mouth size vs TS parameters?
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Old 20th May 2007, 07:47 PM   #418
316a is offline 316a  England
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Quote:
Originally posted by freddi
hi 316a - good start on 2206 - how are you esitmating throat, flare and mouth size vs TS parameters?
I do what was suggested a few posts back as I don't really know what I'm doing . Just play around with the numbers until the thing models ok Then do it again etc . Eventually I may understand what is really going on

cheers

316a
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Old 20th May 2007, 10:40 PM   #419
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i thought it might be a good driver...since it pretty much the same motor and magnet of the 2226H which is one of jbls best speakers....but the only differnece is is having only to push a 12 inch cone......i thought about this cus i think someone mentioned and it appeared that Mr. Danely uses car high end subs with large magnets for control.
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Old 20th May 2007, 10:40 PM   #420
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i really hope a TH works well for the JBL 2226J...i think its the best driver for (the money) on the market.

notice i said J....because used 2226H's and J's on ebay go for 150$.....new 400.

usually u buy crap on ebay as far as used PA equipment from roadies throwing cabs around, and other ways of wear and tear but the J's (the 16 ohm version) are used and sold by home cinema jbl fanatics (like in the jblaudio heritage forum) that keep this 4648-8 double 15 in their home theater, not to mention real theaters.....bottom line is they are all in pristine condition....i just bought 9 of ebay in the past 6 months. the G's (4 ohm versions) are also in horrible condition as they are often used in car systems.

anyway i have those 9 plus 4 - 2268H's (18 inch drivers) ready to throw them in a horn design as they should be.
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