Jim Griffin Jordan MLTL (modified GM 48)

tgorham3 · 08:39 PM

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

tgorham3 · 29th December 2011, 09:07 PM

Some of the original materials...

Jordan with a Ribbon MLTL

DIY enclosure designs

Jim Griffin · 29th December 2011, 09:38 PM

I used 15.5 inches (internal dimension) centered down for the JX92S.

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

Jim

tgorham3 · 29th December 2011, 10:48 PM

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

tgorham3 · 30th December 2011, 01:26 PM

I just noticed a cut and paste error in entry #1.

Jim's port length is 3" NOT 2.75"

29th December 2011, 08:36 PM	#1
tgorham3 diyAudio Member Join Date: Jan 2004 Location: KC Metro	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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29th December 2011, 09:07 PM	#2
tgorham3 diyAudio Member Join Date: Jan 2004 Location: KC Metro	Some of the original materials... Jordan with a Ribbon MLTL DIY enclosure designs

29th December 2011, 09:38 PM	#3
Jim Griffin diyAudio Member 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

29th December 2011, 10:48 PM	#4
tgorham3 diyAudio Member Join Date: Jan 2004 Location: KC Metro	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

30th December 2011, 01:26 PM	#5
tgorham3 diyAudio Member Join Date: Jan 2004 Location: KC Metro	I just noticed a cut and paste error in entry #1. Jim's port length is 3" NOT 2.75"

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