It's the way forward if the cone (physical profile, microresonant structure) and motor design require it. It isn't if they don't.
No panaceas or automatic 'improvements' in audio, alas. What applies in one case doesn't in others. For e.g., the Fostex MG-850, Thiele CS-2.4 & some others have the dustcap physically attached to the end of the VC. It's part of the design. Bit tricky to use a phase plug in such cases.
The Lowther PM45C Drive Unit
Pincushion style frames are probably more widely employed than circular for wideband drivers. Fostex, TB et al all extensively use them.
It's the way forward if the cone (physical profile, microresonant structure) and motor design require it. It isn't if they don't.
you forgot dual concentric drivers
I'm just interested to see if some companies making metal cone drivers follow suit.. if the cone / motor are suitable of course
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They already exist. Here's one: Tang Band W4-1337SD 4" Titanium Driver 264-848 Plenty of midbass units with them too. They're mainly found in drivers with a moderate - deep cone profile. Less useful / not useful with a flatter cone.
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That polepiece extension isn't a "phase plug," except in the eyes of optimistic marketers.
Its effect on the on- and off- axis FR is going to be de minimis. It will slightly lower efficiency, though.
(The phase plugs used on the tweeters of concentric drivers - Tannoy Tulip, KEF Tangerine, etc. - are very different. They actually do what's claimed, and note that they cover substantially all of the tweeter's surface.
It does, however, trade materials/tooling costs for assembly costs: with the polepiece extension, Jordan doesn't have to spring for somebody to glue on dustcaps.
The driver chassis dimensions/drawings are now on the Jordan site, together with an announcement about the first production units:
http://www.ejjordan.co.uk
The chassis dimensions are on the Drive Units page.
http://www.ejjordan.co.uk
The chassis dimensions are on the Drive Units page.
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Yes, what a mistake the new chassis. A lot of customers lost, me included.
Northernsky
Not likely. Unless someone upfronts the 5-10 K$ for new tooling. Small manufacturers usually have to use an existing basket.
I'm fine with the shape. I always found this shape more aesthetically pleasing, and i started rebating drivers with B139/B200/B110.
dave
And the new Jordan perhaps a standard Lowther chassis then? One mans gravy, I happen to think the new design is hideous in comparison, and really you look at your speakers as much as you listen to them!
Still at least EAD is still chucking out the old JX92 design.
Tannoys are a similar shape, or were the last time I looked at them (some years ago). The whole speaker is smaller in width/height and depth, which will make it easier to fit in triangular enclosures, narrow cabinets, etc.
The new shape doesn't bother me other than requiring a bit of extra woodwork. I prefer my speakers behind grilles, especially the alloy cone variety; the shiny surface is too tempting to the "ooh what's that made of then?" brigade.
The new shape doesn't bother me other than requiring a bit of extra woodwork. I prefer my speakers behind grilles, especially the alloy cone variety; the shiny surface is too tempting to the "ooh what's that made of then?" brigade.
+1 on grilles for metal cones
Re the frame style; to whatever degree Ted has choice in the matter - it could well be an accountant with a spreadsheet telling him "y'all can save X dollars / lbs/ yen per pair by using existing parts" - as long as his name in on them, let's stop second guessing the reasons, engineering or otherwise for any aspect of the design , and just listen to the damned things
anyone heard them yet?
yes, dealing with rebating of any none circular shape can be "fun" the first time, but isn't that what DIY is all about?
spend an hour making a perfect pattern, then you can replicate to your heart's content with a router (or work in a commercial shop with a $150,000 CNC and blast them out at the rate of dozens an hour)
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