Truextent Diaphragms in JBL four-inch compression drivers

[timc]

Ah...I thought you just lacked the woodworking skills.

But don't you already have a pair of original 4338's? Can't you make a casting mold with them as a base?

[4313B]

Ah...I thought you just lacked the woodworking skills.

But don't you already have a pair of original 4338's? Can't you make a casting mold with them as a base?

I wouldn't risk it. I'm currently trying to come up with a decent grille design for my H4338's so they are protected from kids.


The only two tasks that I have left in this thread (that I am aware of) are measuring Dan's horn and measuring the 2446 with the Truextent diaphragm on the 2311 or H93 horn with the 4355 network.

[originaltubino]

Belated thanks for the great new info posted here, such as the FR of the TAD 4001 with EQ. Since my living room system includes the 1601a and TD-4001 on TAD clone horns, this greatly interests me!

The H4338 is the best horn JBL has produced to date.

I would very much like to get my hands on a pair of those horns. Maybe the combined talents of the Toledo group could eventually produce them in wood. But to be honest, I would have to hear sonic advantages over the radial wood horns before diving into that project...

[4313B]

But to be honest, I would have to hear sonic advantages over the radial wood horns before diving into that project...

Yep. They aren't for everyone.

The H4338 and 1400 Array/SAM1HF horns are very similar in performance. The wonderful thing about the SAM1HF is that one can actually buy it here in the U.S. I don't know what the hell JBL was thinking making it available here, maybe someone goofed.

[eso]

... I wish I had the skills necessary to build a pair of wood H4338's.

What do those look like? Any pictures handy?


I might be able to help you out with that. Exotic Veneers are extra.



eso

[4313B]

Here's a photo I found of them mounted in some enclosures.

[eso]

I could do that. I would either need some good drawings/dimensions/radii or a physical example to reverse engineer.



eso

[Dingusboy]

I could do that. I would either need some good drawings/dimensions/radii or a physical example to reverse engineer.



eso

Perhaps something like this Laser scanner could get the job done with little investment and even less worry.

[originaltubino]

Perhaps something like this Laser scanner could get the job done with little investment and even less worry.

Or one of those doohickeys like a superfine comb where the steel-pin teeth push in to make a copy of any surface curve. That photo makes it look do-able, but is the throat transition something especially complex?

[eso]

Or one of those doohickeys like a superfine comb where the steel-pin teeth push in to make a copy of any surface curve. That photo makes it look do-able, but is the throat transition something especially complex?

No doubt there is some complexity within the throat. Notice there is a slot that is narrower than the throat of the driver. I would guess then that the sides are expanding faster than the top and bottom coming together while transitioning from round to ~rectangular. That is one of the difficult areas, the other being getting a nice veneer pattern on the compound curves of the mouth.

The rest is fairly easy.


eso

[Zilch]

I finally got around to digging this old post up: #27

Yes, I had that in my file here, but wasn't about to repost it.

Why are you still interested in these waveguides after I bent over backwards to get you a pair of H4338's? The H4338 is the best horn JBL has produced to date. I've not seen your project employing them. I wish I had the skills necessary to build a pair of wood H4338's.

It's not about me, and it never was; I only ever showed what others could do, that they might, if they wanted to.

We are very much alike in this respect, and it has worked out well. I hold you personally responsible for this....

[Chas]

We are very much alike in this respect, and it has worked out well. I hold you personally responsible for this....

[JoMoCo]

Yeah, lets see that diaphragm performance measured at Zilchlabs...maybe with the CLIO wavelets????.....would be nice to see it both on a 90x40 wave guide and a 2380 horn w/the 2445?....

[4313B]

Yeah, lets see that diaphragm performance measured at Zilchlabs...maybe with the CLIO wavelets????.....would be nice to see it both on a 90x40 wave guide and a 2380 horn w/the 2445?....

Measure the whole fuckin' lot at "Zilchlabs"...

Moderators, please whack this thread.

[Mr. Widget]

Measure the whole fuckin' lot at "Zilchlabs"...

Moderators, please whack this thread.

I thought that request was quite peculiar myself... I don't think it was meant to trivialize your work, I think it was posted out of ignorance. The assumption being, it would be interesting to see what these diaphragms do in a more familiar driver and affordable horn.

I think most of us who work with a variety of horns and drivers can make great use of the information posted on this thread... unfortunately not everyone gets it.



Widget