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Old 20th May 2010, 10:25 AM   #1
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Default 4" jordan plus woofer design

Here is a design from Tom Evans (saw it mentioned in stereophile in front under shows).
He uses a Jordan 4" in a sealed box then rolls in a woofer with a single inductor.

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serial number 1 and 2 are for sale on audiogon right now for just over $9,000


"SORAsound is proud to have a pair of Tom Evans speakers (6,000 GBP) on demo in our showrooms. All of the speaker electronics were designed using a Jordan Jx92s run full range without a crossover. In this new design the Jordan driver is limited to 120 Hz only by the volume of air behind it (lowering distortion with the reduced excursion without any crossover parts). The bass system is deep tight and very fast. It works from 120Hz down. This driver is (like most mid bass units ) is a little peaky at 2Khz and because it starts to roll off at 120Hz the peaky rubbish is greater than 24db down (inaudible). Because it has a narrow bandwidth, it does not excite the cabinet (no box honk). Tom Evans is on a mission to reproduce the recorded arts accurately."

norman
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Old 20th May 2010, 11:47 AM   #2
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Originally Posted by norman bates View Post
This driver is (like most mid bass units ) is a little peaky at 2Khz and because it starts to roll off at 120Hz the peaky rubbish is greater than 24db down (inaudible).

norman
bit confused by this..
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Old 20th May 2010, 11:54 AM   #3
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talking about the woofer, not the jordan.

usually those light stiff metallic cones ring like a bell at higher frequencies, you can see it on freq charts past 1-2khz.

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Old 20th May 2010, 11:55 AM   #4
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He's talking about the woofer, not the jordan.

The metallic cones usually have spikes in the frequency graphs past 1khz. Not only are they louder there, but they are also ringing (waterfall response).

Norman
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Old 20th May 2010, 12:08 PM   #5
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Tom Evans- didnt he design some v nice amplifiers and work with Patrick Handscombe? Or have I got the wrong guy
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Old 20th May 2010, 04:23 PM   #6
chrisb is offline chrisb  Canada
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Sorasound's website confirms this is the same Tom Evans responsible for the "groove" series of phono stages among other things.

SORAsound | ZYX phono cartridges, AMAZON turntables, Moerch tonearms, HiFi high-end audio


Regarding the loudspeaker, it's not clear from the available descriptions which driver this design uses for bass support, or the method of XO / amplification with which the system was voiced, but note that one of the pictures on the Sorasound site shows two pairs of input terminals. Whether for simple passive bi-wiring or active bi-amping isn't clear.

Tom designs a complete line of electronics, including at least 2 models of amplifiers, and it's not hard to imagine that a custom line level XO and possible EQ would be part of an integrated system.
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Old 20th May 2010, 05:36 PM   #7
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it looks like a HiVi M8 to me
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Old 20th May 2010, 06:26 PM   #8
chrisb is offline chrisb  Canada
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it looks like a HiVi M8 to me

at the asking price, I'd be inclined to think more like Accuton, etc., but of course this is all conjecture
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Old 21st May 2010, 10:52 AM   #9
Colin is offline Colin  United Kingdom
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Tom Evans also designed a 4L polystyrene enclosure for the JX92 and was responsible for some tweaked versions of Pioneer integrated amps in the 1990s..

You could do the same with any bass unit / enclosure combination that matched the sensitivity of the JX92. Jordan has (or had) a similar approach with the JX125 or 150 rolling off via an inductor and the JX92 left unfiltered in a 3L box. A better route would be to go active and roll off the JX92 electronically, giving more power handling.
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Old 21st May 2010, 11:01 AM   #10
adason is offline adason  United States
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"for sale on audiogon right now for just over $9,000"

good luck with that! I would know way better to spend nine grand on speakers than those!
imagine what you can build for that amount of money...
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