24 March 2008

Jordan JX92S Fullrange Drivers

Recently I aquired a pair of Jordan JX92S Fullrange Speakers as part of a group buy organized through diyAudio.com. Ted Jordan of E J Jordan Designs has been developing his drivers for some 50 years and his drivers are very well regarded. The Jordan drivers are different from most similar sized fullrange drivers in that they cover almost nine octaves! The Jordan JX92S speakers are well built and use a cast frame. The cone and dust cap are metalic. The pole piece is vented and the magnet is sheilded. I measured the Theile/Small T/S parameters using the new Dayton Audio Woofer Tester 3 (WT3). The measured parameters I came up with do not match very closley with those published by the manufacturer. See the Jordan JX92S Fullrange Speaker page for a detailed comparison of the T/S parameters. However, do note that the parameters measured by myself using WT3 are consistent with those measured by Zaph|Audio using SoundEasy and the Dayton Audio Woofer Tester 3 (WT3).


Given that Qts was measured to be near 0.6, a relatively large vented enclosure will be required to get some bass depth from this driver. To try minimize the size of the enclosure (for WAF), an Aperiodic Speaker Cabinet Design can be considered. Seeing that I have a unused pair of 0.25 ft^3 curved Parts Express speaker cabinets, I may go this route. The JX92S drivers have been used successfully in a wide variety of enclosures.

Related DIY Loudspeaker Projects: What's Playing: Lisa Loeb - Snow Day

4 comments:

  1. Hi, thank you for the Jordan JX92S measurements. It is interesting that they are fairly different from those published by EJ Jordan. Are you sure that you have measured them correctly?

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  2. My measurements results are consistent with what others are getting when they measured this driver. My understanding is that Jordan will be measuring drivers from the recent production run. Hopefully we will see some results soon.

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  3. I also found the parameters to be far from expected. I found in practice both of my drivers are identical within 0.5dB but find it difficult to produce bass below 70Hz in an enclosure less than 25L, I cannot explain why it would deviate so much.

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  4. I would really be interested in knowing more details. Can you post or email me your measurement results and what you used to measure the drivers.

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