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Zilch
09-26-2008, 10:47 AM
http://www.lansingheritage.org/html/jbl/plans/c35-c39.htm

Yada, yada....

robertbartsch
09-26-2008, 01:38 PM
...The modern space-age silver feet are a wonderful design feature.

SMKSoundPro
09-26-2008, 04:44 PM
They'is be'ins Zilchified!!!

hallelujah!

How do they sound???

Quite a tidy little package!

Scotty.

Zilch
09-26-2008, 06:47 PM
2.8 cuft by my calcs, Scotty, and thus, they be good.

Still sealing, measuring, tuning, and tweaking at this point; several driver combos yet to try.

Yeah, we have the original grilles, too.

[Nobody'll EVER know.... :D ]

http://audioheritage.org/vbulletin/attachment.php?attachmentid=31698&stc=1&d=1206093430

Ye ol' banana curve:

Skywave-Rider
09-27-2008, 03:34 PM
Still sealing, measuring, tuning, and tweaking at this point; several driver combos yet to try.

Get busy.

I love those.

Wow, 725 x-o.
I wonder how the beamwidths jive at that freq.

(And I love how the ports magically appear in the last pic. :))

SMKSoundPro
09-27-2008, 03:46 PM
Outstanding!!!

The more I know, the more I like a simple two-way approach. I have been realy enjoying the L200b's at work. Yes I added a slot tweeter, then added two 2245 18's from 80hz down; but that being said, I keep coming back to a simple 2-way.

My good friend keeps going on about L300's and yesI would like a real pair of them. I may just build some, but after seeing these wonderfully potent little Zilchified cuties, I may need to go this route.

Great work, as always. Lisa says hi!

Scotty.

Zilch
09-27-2008, 07:54 PM
A big "HIYA!" back to Lisa, please, Scotty.... :wave:

Chas
09-27-2008, 09:53 PM
Yeah but, how do they sound to you? - Looks like a very nice combination.:)

Zilch
09-28-2008, 03:33 PM
These thread-on 90° x 50° JBL PT Waveguides are $9.90 apiece from JBL Pro Parts, Part# 338800-001.

Here are the polars with $40 Selenium D220Ti drivers as measured by Earl Geddes in 7.5° increments earlier this year, horizontal first, 45° oblique, then vertical, bottom. Light blue is 30°, i.e., 60° included angle beamwidth. The bold horizontal divisions delimit +/- 2 dB: