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boputnam
09-01-2003, 02:02 PM
JBl enclosure plans and porting charts

http://www.lansingheritage.org/html/jbl/plans/1970s-kit.htm

Guido
09-01-2003, 02:21 PM
Hi Bo!

Great Posting but we need more res.
I can't read anything

Guido
09-01-2003, 02:43 PM
What do you think about uploading the pdf for all users?

Thanks Bo!

boputnam
09-01-2003, 03:06 PM
"What do you think about uploading the pdf for all users?" Great suggestion - I don't use that enough (sorry, Don...!! :o ).

I've redone them all - let me know if that works...

http://www.lansingheritage.org/html/jbl/plans/1970s-kit.htm

Guido
09-02-2003, 04:40 AM
Yeah!

Thanks Bo!

Guido
09-03-2003, 02:14 PM
Why you ask?:D

Of course!

Thanks

Guido
09-03-2003, 02:15 PM
He this was only 2 minutes online!

:confused:

4313B
09-03-2003, 04:36 PM
For reference -
1975 JBL Transducer - Enclosure Porting Information

http://www.lansingheritage.org/images/jbl/plans/1975-kit-plans/1975-porting.gif

boputnam
09-03-2003, 04:47 PM
from Giskard
For reference -
1975 JBL Transducer - Enclosure Porting Information

Kisses! Since I now know, how good looking you are, ba-by! ;)

4313B
09-04-2003, 08:07 AM
For reference -
1977 JBL Transducer - Enclosure Porting Information

http://www.lansingheritage.org/images/jbl/plans/1975-kit-plans/1977-porting.gif

There are a few changes from the 1975 chart. Plus the 1977 chart includes the tunings for the 3.0, 5.0 and 8.0 cubic foot enclosures as described in the Enclosure Construction Kit which Bo has posted in this thread. One should notice the discrepencies.

4313B
09-04-2003, 08:11 AM
In addition here is the tuning information as printed in the separate Loudspeaker Component Series Instruction Manuals:

Have fun! :)

http://www.lansingheritage.org/images/jbl/plans/1975-kit-plans/1970s-tuning-freq.jpg

boputnam
09-04-2003, 08:39 AM
Hey, Giskard...

Combining these fb charts with the plethora of JBL discursive literature you posted over Labor Day provides a powerful - shall we say "enabling" ? :hmm: - reference for better and precision JBL cabinet building.

Wonderful, wonderful stuff. :bouncy:

4313B
09-04-2003, 11:01 AM
And then there are all the AES Journals :) Those are a hoot and a holler :p

Here are some good references -

"Thiele Small Nuts and Bolts with Painless Math" by Drew Daniels (Teac)
70th AES Convention 1981

"Loudspeaker Athletics" by Jeffery N. White (Electro-Voice)
61st AES Convention 1978
JAES Vol 27 Nov 1979

"Constructing Loudspeaker Systems With Predictable Performance" by Jeffery N. White and Raymond J. Newman (Electro-Voice)

"Sensitivity of Theile's Vented Loudspeaker Enclosure Alignments to Parameter Variations" - by D.B. Keele (Electro-Voice)
JAES Vol 21 May 1973

"A Tubular Tuning Method for Vented Enclosures" D.B. Keele (Electro-Voice)
JAES Vol 22 Mar 1974

"Experimental Determination of Low-Frequency Loudspeaker Parameters" by J. R. Ashley (University of Colorado at Boulder) and M. D. Swan
JAES Vol 17 Oct 1969