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Old 27th April 2004, 05:07 PM   #1
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Default Help with Jordan design....

OK,

I want to design something with those Jordan drivers. Simple design and crossover a must.

Either:

a fullrange system with just the JX92s
or the JX53 with the JX125.

Haven't decided on dipole, IB etc.... looking for input on best way for these.

I am also looking to increase sensitivity by using multiple drivers.

Also may couple them in a push-push configuration to cancel distortion..

HELP!!!
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Old 27th April 2004, 05:42 PM   #2
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I assume this is your first speaker project? I'd start with the Jim Griffin design, full range in a ported cabinet with baffle step correction. These sound really good...after much break-in. Simple design, easy project.

Then if you really want to design something yourself, you at least have a reference. Doing a google search, you can find several enclosure designs being used with this driver.

Do you have a table saw and a router?
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Old 27th April 2004, 06:26 PM   #3
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Default decided....

Probably go with 2 JX92s per channel.

One run full range.

Other run enough to account for baffle step.

Will look into ported design... tuning is an issue yet.
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Old 27th April 2004, 06:35 PM   #4
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A TL design i did for the JX125 (untried). It would have to be tweaked a bit for push-push.

dave
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Old 27th April 2004, 06:53 PM   #5
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Default ok here it is...

ported design.

1 cu foot enclosure tuned at 45Hz.

12in wide, 20in high and 7in deep or so.

2 drivers per channel. one run full, other run to baffle step corner frequency.

port on front. slot loaded. 12in wide, 1/2 inch high and 2 3/4 in deep.

mach number is 0.09

Will it matter if I put the port in between the drivers, or just at the bottom?

Thanks!!!!
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Old 27th April 2004, 07:40 PM   #6
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Default Re: ok here it is...

Quote:
Originally posted by AudioGeek
2 drivers per channel. one run full, other run to baffle step corner frequency.
If you are going to do that, then the best place for the 0.5 driver, by far, is on the back of the box, mounted push-push.

dave
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Old 27th April 2004, 09:30 PM   #7
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Default why is that???

can you explain to me the advantages of mounting on the back for a 0.5 driver???

Thanks!
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Old 28th April 2004, 06:19 AM   #8
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Default Re: why is that???

Quote:
Originally posted by AudioGeek
can you explain to me the advantages of mounting on the back for a 0.5 driver???
As you roll off the 0.5 driver its phase rotates thru 90 degrees. As it rotates it gets more & more out of phase with the driver that is not rolled off.

When you mount a 2nd driver on the back of the box it will perfectly compensate for baffle step loas. As long as the 0.5 rolloff is above the bafflestep frequency, the phase roll is hidden in the shadow of the box (ie this part of the sound only radiates backwards -- by the time it gets back off the back walls, it is so delayed and so mixed with the room, that the phase roll has little if any effect).

Further, by mounting on the back, it is convienient to mount the drivers back-to-back (push-push) and, if rigidly coupled, actuvely cancels driver vibration and improves downward dynamic range.

of course you can also choose to not roll off the back driver at all and have a bi-pole (works well with FRs)

dave
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Old 28th April 2004, 07:17 AM   #9
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heard the JX92 has very limited HF response. in that case a 53/125 might be a better bet. Jordan recomends 4 x 53s line source. how does he handle comb? anyone know?
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Old 28th April 2004, 07:39 AM   #10
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Quote:
Originally posted by navin
heard the JX92 has very limited HF response. in that case a 53/125 might be a better bet.
Certainly go lower & higher... XO 1st order anywhere between 500 & 4k -- i've heard series at 3-4k works pretty well.


Quote:
Jordan recomends 4 x 53s line source. how does he handle comb? anyone know?
Would be very similar to the 7th viel.

dave
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