Jim Griffin Jordan MLTL (modified GM 48) - diyAudio
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Old 29th December 2011, 08:36 PM   #1
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Location: KC Metro
Default Jim Griffin Jordan MLTL (modified GM 48)

Jim Griffin has posted some details of a slightly shortened version of GM's 48" MLTL for the Jordan JX92S. The missing detail is where the Jordan is positioned from the top.

The GM 48 is spec'd as
Internal Height = 48
Internal Width = 6.97
Internal Depth = 4.31

Center from top = 15.46

Port = 2.0625 OD X 2.75 L

The JG 46 is spec'd as
Internal Height = 46
Internal Width = 6.00
Internal Depth = 4.875

Center from top = ?

Port = 2.0625 OD X 2.75 L

So my options to position the speaker seem to be to
a) Assume that Jim did not provide this measurement because it is the same as the GM design he used as a starting point
b) Fudge it by using a ratio... GM center is 15.46
giving the ration 15.46/48=.322083
so for the JG 46 the center would be 46*.322083 = 14.816
c) The speaker position for the JG design has been published and I just failed to find it and some kind person is going to point me in the right direction.

I have no clue how the change in internal volume (GM 1442, JG 1345.5) and change in port influences the driver position

Any help anyone can offer is appreciated.

Cheers...TG

Last edited by tgorham3; 29th December 2011 at 08:39 PM.
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Old 29th December 2011, 09:07 PM   #2
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Some of the original materials...

Jordan with a Ribbon MLTL

DIY enclosure designs
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Old 29th December 2011, 09:38 PM   #3
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Join Date: Jun 2003
Location: Tennessee
I used 15.5 inches (internal dimension) centered down for the JX92S.

If you need more details, please contact me via this site.

Jim
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Old 29th December 2011, 10:48 PM   #4
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Excellent to hear this from the man himself! I didn't have the confidence to rout the baffle on a guess (and one that would have been wrong at that).

Thank you for making the design available and for filling in the missing piece of the puzzle.

Cheers...TG
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Old 30th December 2011, 01:26 PM   #5
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I just noticed a cut and paste error in entry #1.

Jim's port length is 3" NOT 2.75"
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