Phase Plugged JX-92S

[soongsc]

Or so... i had a pair of his Jordan Watts 32 years ago, and before that he was doing the 50 mm driver & before that he was at Goodmans so > 50 years.

As to the phase plug in the JX92, i won't hazard a guess... the cap does seem a left over from the JX150 where its shape had as much to do with it being part of the suspension as being a dustcap.

dave

Have a look. Ted is probably 80 now, I think he deserves some respect for this dedication to speaker drivers no matter what.

 

[JohnnyBoy]

PS... very nice (aluminum?) enclosure.

Aluminum would have weighed a lot less. These are stainless steel

Dave, once I get my hands on a dead JX-92 oe or two, I'll find out what its like to remove the dust cap. If it all goes well, I'll send the drivers your way to have custom plugs made.

J

 

[Colin]

Actually I think Ted is in his mid-70s.

As George mentioned earlier, I had a pair of the mk 1 JX53s which had an aluminium phase plug in place of the dustcap of the mk 2. Having listened to both in system (crossing to a JX125 at 500Hz), the phase plug version sounded harder and less relaxing to listen to. The new JXR6 driver also uses a dustcap, a smaller version to the one in the JX92, and that sounds very sweet at HF.

I'm sure Ted would be the first to admit that the JX92 can be improved but given the fragility of the cone material, I'd be reluctant to try removing the dustcap.

 

[JohnnyBoy]

given the fragility of the cone material, I'd be reluctant to try removing the dustcap.

That's why I want to practice on a cadaver or two first!

 

[planet10]

Ted is probably 80 now, I think he deserves some respect for this dedication to speaker drivers no matter what.

Ted has to be considered one of the giants...

dave

 

[planet10]

I'm sure Ted would be the first to admit that the JX92 can be improved but given the fragility of the cone material, I'd be reluctant to try removing the dustcap.

very good point... with the nature and careful shaping of the jordan cones, the dustcap provides some structural purpose beyond being a dust protector.

dave

 

[Stixx]

very good point... with the nature and careful shaping of the jordan cones, the dustcap provides some structural purpose beyond being a dust protector.

...what I've been meaning from the beginning.
But there's always people who think they can do better ...

Well, when it's only at the cost of a cadaver...

 

[soongsc]

...what I've been meaning from the beginning.
But there's always people who think they can do better ...

Well, when it's only at the cost of a cadaver...

I've always wondered what the shape change would do to the response, and what the size of the caps on the JX125 and JX150 would do to the response. The JX125 once had a small VC cap as you can see in my previous post.

Recently I've started to play around with the "gated sine sweep" in SoundEasy, and results are quite interesting in comparison with MLS type measurements. Hope to get more understanding on what the small differences indicate.