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Old 12th September 2015, 01:14 PM   #1
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Join Date: Sep 2015
Default JX 92S Advice

Morning All,

First post in the Forum!

Having already completed a couple of speaker projects.
A Fostex FE127E vented.
and a small LM-1.
Both I use in my lounge for my vinyl through a Marantz PM-48 amp.

Now a good friend of mine has given me a couple of JX 92s, unused still in the boxes. Now these seems to be good drivers from what I have read.

So I am looking to do a project with these full range drivers.
Heres the rub..... being they are more advanced the box design needs to be something a bit more advanced that what i am used to.

My major limiting factor here is size. i do not have space in my flat for a floor standing design.

If i do a smaller box will i need to add a tweeter & crossover? (never done this before!) if so what do i need? do i need any other electronics in the box?

i have done some smaller electronic projects before like headphone amps, so know a bit of this.

Need all of your invaluable help on this!

thanks
Chris
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Old 12th September 2015, 06:44 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

The JX92S is a full range driver, though the top end disappears off axis.
All it needs is a sealed and stuffed 10L to 15L well built box, and some
built in BSC, of the RL in parallel in series with the driver variety.

rgds, sreten.
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Old 12th September 2015, 07:25 PM   #3
PJN is offline PJN  United States
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They are really nice drivers, I have a pair. There are several smaller designs out that would work, do a web search. Jim Griffin did a smaller design some years ago that was very well received.
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Old 14th September 2015, 03:03 AM   #4
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Location: Tennessee
Over the years I have built several Jordan JX92S designs. These include a full range mini-monitor in a 7 to 9 liters enclosure which can be either sealed or vented, a two-way mini-monitor pairing the JX92S with a small ribbon tweeter (Aurum Cantus G2si), and later that two-way evolved into a floor standing mass-loaded transmission line speaker. You will find discussion of all of these on several diyAudio postings if you search.

Click the image to open in full size.

Click the image to open in full size.


Crossing Over Jordan

Jordan with a Ribbon MLTL

Several of links in the old postings may be missing but if you are interested, I can help you if you contact me.

Good luck on your project.

Jim

Last edited by Jim Griffin; 14th September 2015 at 03:05 AM.
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Old 14th September 2015, 06:39 PM   #5
Colin is offline Colin  United Kingdom
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As Jim says, a straightforward vented box is the easiest way to go. The design we used to have on the website had an internal size 30 x 15 x 18 cms and vent size 3cm diameter x 11 cm long.

If you decided you prefer sealed, you can just block the vent and you're close to the ideal sealed loading.

One of the best enclosures was GM's 31 MLTL which was a floor-standing column. Very discrete appearance but sounded terrific. I did work out a bookshelf 'folded' version of that at one stage which I can look out, if you wish. Be warned that I didn't build the folded version, just the standard column.
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Old 20th September 2015, 12:22 PM   #6
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Hi Jim, Colin

Lots of info there, many thanks.
I am going to stay to a smaller size due to available appartement space so the MLTL is not for me.
Is the difference significant with the addition of the Aurum Cantus G2si? as this is an extra 260USD (i have to search out a euro supplier) on the cost.
Then, with this I will need to build a cross over to add (never done this)....looks like the link is down for this if you can supply would be much appreciated.

For the vented box, will this need to be stuffed/lined....etc
You lost me on the 'folded' version, what does this mean?

Thanks again
Chris
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Old 20th September 2015, 06:45 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

FWIW its a pointlessly very expensive choice of bass/mid
to go with a ribbon, its best used doing what it does, FR.

rgds, sreten.
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Old 20th September 2015, 08:47 PM   #8
PJN is offline PJN  United States
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Join Date: Dec 2004
Location: Pa, USA
Sreten is right, you have nothing to lose by trying is running full range with no tweeter. You need a baffle step filter though to make it sound balanced. A 1.5 my coil in parallel with a 6 to 8 ohm resistor might be a good starting place, adjust the resistor to taste. If you feel you want more shimmer on top try bypassing the bsc after with a 1 UF cap.
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Old 21st September 2015, 12:31 PM   #9
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Default Comments/Answers to Questions

As suggested earlier, you can start with the Jordan as a full range monitor. I use the foam 'egg crate' style absorber to line the insides of my 7 liter vented box. Maintain a clear air flow path between the rear of the driver and the port tube.

If you choose to add the tweeter, the crossover is shown in post #9 of this link:

Jordan with a Ribbon MLTL

Neither the mini-monitor nor the MLTL enclosures that I built were folded so I'm confused by your comment.

As suggested by PJN, you will need a baffle step correction circuit for the full range driver version. The version with the tweeter has BSC built into the crossover network. The mini-monitor and MLTL versions use the same crossover network if the enclosures are 7.5 inches wide as I used.

Your Questions:
"Is the difference significant with the addition of the Aurum Cantus G2si? as this is an extra 260USD (i have to search out a euro supplier) on the cost.
Then, with this I will need to build a cross over to add (never done this)....looks like the link is down for this if you can supply would be much appreciated.

For the vented box, will this need to be stuffed/lined....etc
You lost me on the 'folded' version, what does this mean?"
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Old 21st September 2015, 04:38 PM   #10
Colin is offline Colin  United Kingdom
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My fault - I mentioned that I had sketched an idea for a folded version of Greg's 31" MLTL to make it into a stand-mount speaker. It ended up about 12" deep so not very practical and no guarantee it would work.

If no room for the official column version, I would stick with the 8 litre vented box. Build it to Jim's specifications and his original designed included a BSC circuit to balance the sound which works fine.
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