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Old 5th October 2003, 05:46 PM   #81
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Just teasing you there Variac,

Hope you didn't mind to much

I have some of the same problems,
before going to sleep in the evenings I dream up wonderful systems,
when I wake up the next morning , reality sets in

cheers
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Old 7th October 2003, 09:47 PM   #82
Variac is offline Variac  United States
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Well, I'm feeling a little sick, thinking I sould have gotten more, but some of the rest of you (in the USA at least)should feel worse. The Lansing Heritage forum came through-I wish I had known of them earlier, Thanks Roddy!! I knew about the site, but not the forum.

Turns out that my JBL woofers are from 4 way monitor speakers sold in Asia: the 4344 Mk 2 . Balanced with aluminum shorting ring. The 4344-2 were introduced in about 1995 it appears, and the docs I got from a helpful guy were last revised in 2001. I think they are now discontinued. Battery biased crossover, very expensive. .
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Old 8th October 2003, 12:31 AM   #83
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Well Mark,

You'll have to add that one to the "One that got away" list (at least you have two).
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Old 8th October 2003, 05:23 AM   #84
Variac is offline Variac  United States
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I got more info, they seem to be more like true woofers in that their Fs is down in the low 30's. The are also "only" about 93 or 94 dB efficient. Since I want to use them below about 180 hz and bi-amped, I think I lucked out. Lest I be accused of being a total jerk, when I said the rest of you should feel sick I was referring to the fact that I offered to get you some too. I'm pretty grateful that I at least got 2 , which is plenty for my needs in truth. They are apparently highly damped so have precise but not generous bass, since they are made to sell in Japan. JBL does seem to make special models for Japan, ie the K2 was first only sold there.
Who knows, they might not be really that great but I have high hopes that they are better than my Selenium PA woofers (which didn't seem so bad to me until the crossover zone....
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Old 21st November 2003, 09:12 PM   #85
Variac is offline Variac  United States
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Here's a link to further discusssions regarding the Radian coax's
and speakers based on the them

http://www.diyaudio.com/forums/showt...&postid=268848

They are made by Galante Audio
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Old 21st November 2003, 09:49 PM   #86
Andy G is offline Andy G  Australia
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Default Deltalite from Eminence

Eminence Deltalite 15" neo magnet, Fs, 41 97dB exactly what you want !!


http://editweb.iglou.com/eminence/em...eo/neo2515.htm
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Old 21st November 2003, 10:26 PM   #87
Variac is offline Variac  United States
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If you consult post #20 you will see that the Deltalite has been discussed.

If we ever ordered a custom speaker, I would think that the Deltalite would be what it would be based on. The frame is open,
the neo magnets are light and easy to ship and up to date,

The problem is that I have had a hard time modeling it so that it will get below 50 hz. in a reasonable sized cabinet Others seem to get similar results, although I'd love to hear more input by other people modeling it. Also from people who have actually heard it!!
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Old 21st November 2003, 11:57 PM   #88
Andy G is offline Andy G  Australia
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Default maybe....

you could try using PiAlign software (free)

http://www.pispeakers.com/contents.html

I had exactly the same problem with the gamma 12, other programs modelled huge, but PiAlign gave me a nice neat size, and they work beautifully !!
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Old 22nd November 2003, 06:38 PM   #89
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Speakers for ported boxes have signifigantly lower Qts than those designed for closed box use. A Qts below 0.38 is low and those above this figure is high. This indicates a large box for speakers with high Qts. If a small box is used then then the speaker should have high Qts with high damping. That's a bit tricky for the average constructor to get right.
The box size also depends on Vas of the driver parameters.

Eminence do several versions of 15 inchers with wild specs.
The Hi Per 427 Qts of 0,38 gets used alot here in power cabinets. The standard 427 has a Qts of 0,87. That is specifically intended for a car boot with piles of Cu volume.
rich
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Old 26th February 2004, 10:04 PM   #90
Variac is offline Variac  United States
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here are some 15" JBL subs that might be great for open baffle:

http://www.partsexpress.com/pe/pshow...299-750&ctab=2

No T-S parameters though. Lots of x-max
They are 4 ohms so get 2 per channel to up the efficiency a bit!
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