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Discussion Starter #1
Hi,

The VWR126X started out as a replacement for the FR125S but with a copper coloured cap rather than a phase plug. In spite of their predominance there is good physics to suggest that many phase plugs are more cosmetic than functional. As development progressed it became obvious that frequency response above 10kHz would be a challenge I was not willing to fund at this time. As the LD25X is also ready to go we decided that it would be good to introduce them together and that's the current plan.

The custom cone is a strand oriented flash thermo formed woven composite and the cap is vacuum deposited copper on aluminum. This type of cone is used by a well known British finished loudspeaker vendor and I'm told that one of the "S" driver manufacturers is looking at use it as well.

I'm expecting full measurements and parameters shortly and am planning other drivers using these materials.

Bob

rsz_vwr126xproto.jpg
 

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Discussion Starter #3
How is development progressing on this driver?
We have 4 samples and are expecting the first order to ship at the end of November. Testing it against similarly sized Morel, Eton, Visaton and SEAS drivers we believe it has lower distortion and higher excursion than all of them. We also expect a Klippel report this week from Red Rock Acoustics.

Combining it with the new LD25X one inch XBL silk dome (also expected in the same shipment) with a simple 1st order crossover results in a stand-mount monitor with staggering resolution and clarity.

As soon as they are on a boat there will be preorder special pricing available on both drivers as well as the 2 way kit. There may also be an MTM kit available.

We are very excited about this new direction and plan to develop more high end drivers.

Bob
 

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I'm excited to see what this thing can do. I currently own a few of the EL70's and the SDX 7's so i expect this driver to live up to its claims.
A simple two way with only a first order crossover is something to be excited about. It means even novices can have incredibly accurate monitors for critical listening at a price point that won't cause them to burst into tears the first time the cabinet gets bumped.
I feel that what happens with this driver and the tweeter will end up shaping the DIY game for a the next while, by setting the bar incredibly high for others to catch up to, Bob will in turn raise the quality standard of the industry.
 

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Discussion Starter #6
Hi,

Both the VWR126X and LD25X (Low Distortion silk dome) production samples by air arrived this week. We will be posting data, pictures, etc. shortly and finalizing the introductory special pricing. The sea shipments will arrive in early January.

The following kit designs are in progress:

Simple ported MT in .25 cu ft with VWR126X running full/direct and the LD25X padded and rolled off with a single cap.

In wall MTM including centre.

In wall MTMMM and MMTMM centre.

Ported MTM in 14 litre (.5 cu ft)

Backloaded horn with 4 VWR126X per side and either a horn loaded planar or a ribbon tweeter.

A series of Fonken style designs from Dave Dlugos where we may ask for some naming help. See Dave's post on nomenclature.

Bob
 

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Both the VWR126X and LD25X (Low Distortion silk dome) production samples by air arrived this week. We will be posting data, pictures, etc. shortly and finalizing the introductory special pricing. The sea shipments will arrive in early January.
Shortly??!?!?

I want PICS ASAP!!! :innocent:
 

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Looks Good. But whats the diff between these and ert26?
To my knowledge, The ert is a simply tweeter designed for a high crossover point to a wideband mid - to push the crossover out of the immediately audible range.

The LD25X is a modern day long throw tweeter than should handle a lower crossover point in the teens; allowing for a smooth driver transition at the crossover point.
 

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Why is it partner with wide ranger? To accomplish 1st order filter for smooth transition? Cone breakup is the main concern here, if any to achieve good performance.

Will wait for more test results :sn:

Cheers
Henry
 

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You fine gents have pointed out some of the design reasoning behind the tweeter.

What can be one of the greatest reasons is the same thing we all think about when we look for subwoofers.

Volume displacement equals greater sound pressure level.

So why is that of interest in a tweeter?

Well in a proper design it should allow lower levels of distortion. That is definitely the case with the LD25X. Greater volume displacement means that the maximum spl generated off of the tweeter will give you greater headroom. A big plus when you are trying to develop a high end speaker system.

A not to often quoted specification in tweeters is maximum SPL and distortion figures. Soon to be released!

Mark
 

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Beyond pure performance information, it is necessary to design a tweeter that will last. Remember that the vc leads need to flex, though just a small amount, at least 100 times as much as the woofer, even more than that compared to a subwoofer. Every time the vc lead flexes, that is just a little more toward its fatigue failure. It would seem that the longer throw tweeters would flex even more shortening the life of those tiny and frail leads.

Or not. (Just echoing the concerns of a couple of others.)
 

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Any news?

Lots.

They have been tested to the point of astonishment on my part. I can say unequivocally that these two drivers are in the top two or three of their type in the world. They have some of the lowest distortion widest and smoothest frequency responses I have ever measured.

So what you waiting for?

Last level of verification. This is being done very carefully. All will be revealed when the big guy is ready!
 

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They have been tested to the point of astonishment on my part. I can say unequivocally that these two drivers are in the top two or three of their type in the world. They have some of the lowest distortion widest and smoothest frequency responses I have ever measured.
Care to share?
 
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