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Old 1st August 2003, 09:48 PM   #1
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Default Dipole Driver help needed

I'm looking at putting together a dipole speaker, but I don't want to mess around with building a crossover or dealing with equalization. So basically I need a full Ranger with >.5 qts and I plan on using a sweeter tweeter on top. Around 50hz fs would due. Heres the kicker I dont want to spend more than $100-$150 per speaker. Less would be preferable.

Thanks advance for any ideas...Lee
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Old 2nd August 2003, 04:23 AM   #2
SY is offline SY  United States
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I just don't see how you can pull this off without some eq, unless you're going to do a really, really big baffle.
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Old 2nd August 2003, 05:15 AM   #3
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Go to Radio Shack and look at their 8" full-range drivers. You will probably have to turn the "treble" knob on your reciever up all the way, but the bass is there.

They currently have two models, both with foam surrounds and whizzers. One is paper cone, one is poly cone. I'd probably go with the poly cone version.

I don't have the specs for them anymore, but it seems like Fs is around 40hz. I know that when I built my dipole with them (2 per box) I got a surprising amount of bass, and it's very fast, light, open, and powerful bass, although with limited max SPL. Mine use paper surrounds though, so no doubt the foam versions with the higher excursion, will fare better.

The drivers can be had for ~20 USD.
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Old 2nd August 2003, 11:31 AM   #4
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Default This driver looks like it may fit the bill..

Moth Audio Cicada Driver Click the image to open in full size.
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Old 2nd August 2003, 01:59 PM   #5
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This one might be better. Creative Sound has them for $115.
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Old 2nd August 2003, 02:12 PM   #6
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I've heard great things about the Jordan drivers, but the total q at .4 looks as if it will require some equalization.

Lets say it does. Could I just use this passive circuit below from linkwitz's site and plug it in between my cd and amp. Looks like a total of 5 components, should be fairly easy to implement.

Click the image to open in full size.
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Old 2nd August 2003, 02:52 PM   #7
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Excellent! Some people are allergic to using EQ, but it's the speaker builder's best friend. You may want to look at what the eq will do to max SPL when you consider the low frequency excursion requirements.
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Old 3rd August 2003, 04:07 AM   #8
tcpip is offline tcpip  India
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Default The Qts requirement for dipoles

I'm a novice to speaker design, so bear with me.

I've read that drivers for dipole speakers should have a Qt > 0.5. If I use theJordan JX92S for all but the lowest frequencies, and have a separate 12" or 15" driver for the bass, does the Qts limit apply to the Jordan too? Or only for the woofer?

Adding another twist, if I build a dipole mid+tweeter using a JX92S and a tweeter, and get the bass (say, 200Hz and below) from a sealed box with two push-push drivers as discussed elsewhere on this forum and at http://www.aloha-audio.com/ME2txt.html , then does this Qts limit apply to the Jordan?

Any comments, even stray thoughts and observations, welcome. What I've described above is the speaker I'd like to build next, with two-way line-level crossover (about 150 to 200Hz), two amps per channel, and (perhaps) a single-cap filter for the tweeter. Time+money permitting. All comments are therefore welcome.

Tarun
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Old 3rd August 2003, 01:31 PM   #9
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The jordan jx92 s will be ok, if you use separate bass drivers from 200-150 Hz downward. But you definitely will need a higher Qts for the woofers, if you want them to run open baffle.

For the output of the jx92S there is no difference whether you make the bass dipole or sealed box. (System and Room response is a different story). Just remember that you shouldn´t cross over lower than 150 Hz.

Rudolf
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Old 3rd August 2003, 05:31 PM   #10
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Default Jordan as a wide-range midrange, open baffle

Dear Rudolf,

Quote:
Originally posted by Rudolf
The jordan jx92 s will be ok, if you use separate bass drivers from 200-150 Hz downward. But you definitely will need a higher Qts for the woofers, if you want them to run open baffle.
Thanks a lot. Now at least I know my original idea is on solid ground. What do you think of the idea of using the Jordan as an open-baffle wide-range midrange driver? Will it be good?

Tarun
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