EAD E100HD in Jordan 31" MLTL (30Hz) Compact Design - diyAudio
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Old 15th July 2013, 06:32 PM   #1
imagios is offline imagios  Czech Republic
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Default EAD E100HD in Jordan 31" MLTL (30Hz) Compact Design

Hi,
I always wanted to have a Jordan speaker home, the JX92s was my goal, but
until I was able to get one, they have changed to be produced by EAD.
I bought the E100HD, and as a enclosure I have chosen the 31" MLTL (30Hz) Compact Design
http://www.eadsweden.com/shop/17596/...31-MLTL-MD.pdf
Designed by M.J.King for Jordan US.
Here are some pictures from the work:

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Has anyone else build it? any experience to share, looking forward especially regarding the stuffing?

I made the mechanical part almost, and tried it just in the MDF enclosure, Im very positive surprised by the driver, Im really looking forward to finish them.
I will keep you updated on the build.
The material to build them incl MDF is about 400EUR.
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Old 15th July 2013, 11:28 PM   #2
GM is offline GM  United States
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Greets!

Haven't auditioned this driver or JX92S in this cab alignment, so can’t comment on how it performs, but it needs to be at least twice as big [WxD area doubles] to get a ‘close enough’ response plot to the one shown on the cab drawing. Also, your ‘doughnut hole’ braces are restrictive enough that I doubt there’s much WL TL action to damp the vent, i.e. acting more like a simple bass reflex.

Not implying it won’t perform well in your system since in a sim it has a very SET tube-like response, just not as the designer intended.

GM
Attached Images
File Type: gif EAD100 v1.1 31' MLTL [MD].gif (6.7 KB, 294 views)
File Type: gif EAD100 v1.1 31' MLTL [MD] optimized.gif (6.6 KB, 62 views)
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Old 16th July 2013, 12:55 AM   #3
xrk971 is online now xrk971  United States
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So how do you suppose they ended up with the 30 Hz sim plot in the pdf flyer?
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Old 16th July 2013, 01:32 AM   #4
GM is offline GM  United States
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It's a sim of a Jordan JX92S. For whatever reason, its EAD replacement apparently wasn't meant to be a drop-in replacement.

GM
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Old 16th July 2013, 09:33 AM   #5
imagios is offline imagios  Czech Republic
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OK that might be a issue the bracing was given at best intention it is 2x 18mm with a 150mm cyrcle cut out.
I might cut it completely out, althou the simulation looks nice as well, but not to 30Hz but only 40hz...
Regarding the driver, since I can not compare it, I can not tell, but EAD made the last jordans, so the E100HD should be a improved Jordan and should work well in Jordan designed enclosures. After I will be done, I can put some measurements.
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Old 16th July 2013, 10:07 AM   #6
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How well the E100HD will work in a box designed for the JX92S depends on how significantly its electromechanical spec. deviates from that of the original drive unit. As GM says, the E100HD needs ~double the Vb of the JX92S for a similar alignment.

Last edited by Scottmoose; 16th July 2013 at 10:25 AM.
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Old 16th July 2013, 12:21 PM   #7
xrk971 is online now xrk971  United States
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Default Sim of 31 inch MLTL for E100HD

I ran a simulation of the 31 inch MLTL with dimensions as provided by EAD (without the donut baffles). GM is correct, the tuning frequency is about 40 Hz (maybe 37 Hz). There is no damping in AkAbak so you will see sharp peaks and dips, but broad features are probably going to show up. One thing to be careful with this speaker, as with most speakers is the placement in the room - it can really have an impact on big dips as you can see. The first plot is the freq response at 1 m away with the speaker placed flush against a wall so that you essentially have no baffle step loss. The second plot is a 'typical' placement of 24 in from a back wall and measurement at a typical listening position 3 m away - not the large dips due to room suck-out. The third plot shows the speaker 60 in away from a back wall to remove wall effect and measurement at 1 m - here the baffle step loss suggests that a BSC should be used to balance things out. Fourth plot is impedance, fifth plot is cone displacement, and sixth plot is impulse response (60 in away from wall, 1 m measurement). One thing is clear though, this box does not look like it was optimized for the E100HD driver.
Attached Images
File Type: png E100HD-MLTL-Freq-0in_wall-1m.png (33.1 KB, 60 views)
File Type: png E100HD-MLTL-Freq-24in_wall-3m.png (34.3 KB, 44 views)
File Type: png E100HD-MLTL-Freq-60in_wall-1m.png (33.8 KB, 33 views)
File Type: png E100HD-MLTL-Impedance.png (26.7 KB, 29 views)
File Type: png E100HD-MLTL-Displ.png (27.1 KB, 16 views)
File Type: png E100HD-MLTL-Impulse.png (16.6 KB, 13 views)
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Old 16th July 2013, 03:52 PM   #8
imagios is offline imagios  Czech Republic
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Thanks a lot for the simulations, I really appriciate that
From what I see, I would have no issue in general, but what is happening between 100Hz
and 1Khz is not satisfying.
The enclosure is now done, so I can just take out the bracings, play a bit with stuffing and adjust the bassreflex.
Im open to suggestions
I have not imagined it will be that much of a difference since EAD did manufacture the Jordan 92 in past.
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Old 16th July 2013, 04:04 PM   #9
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Yes, but unfortunately, as soon as they change the driver, that means the boxes really need to be changed too, assuming you want the same basic alignment. As noted, it'll still work, just not as originally intended.

GM's comparative simulation will be the more accurate reference point to the cabinet's actual behaviour since it does account for damping material, which will kill much of the unwanted harmonic resonances you see in X's akabak plots.

As an aside, don't forget that under practical conditions especially < 300Hz, the room almost completely dominates in terms of dimensions, construction, furnishings & the speaker position within it, so you're never going to get a perfect response. Fortunately our hearing acuity falls rapidly in the lower registers, so it usually looks worse on paper than it actually sounds.
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Old 16th July 2013, 04:24 PM   #10
xrk971 is online now xrk971  United States
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You built it already so you have nothing to lose but to give it a try. The damping will probably flatten the response quite a bit. You may end up liking it just fine. My point was to not give up if you hear something amiss but to tweak placement in room for best sound.
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