DD66000

[grumpy]

Cool. More inspiration re what to do with the set of 2234 and 2345s I have kicking around
Will be interesting to eventually hear more about the design elements and considerations
(in addition to what can be gleaned from the pictures and initial tidbits).

-grumpy

-Looks- like ~10ft3, deviated septum, flared dual ports, cc network, bi-amp-able,
custom port adapter/throat before cabinet integrated horn
and very little internal damping other than the ends of the long 1/2 cyl axis.

[Zilch]

I'm counting on Mr. Widget to come up with a horn. He has SOME experience with that.

Also, we'll need a little birdie horn for 2407/8 or BMS 4540.

For 4" diaphragm mid, the new 2452H-SL is a candidate, as well:

http://audioheritage.org/vbulletin/s...766#post123766

[grumpy]

So cutting in at 700Hz makes vertical component alignment (the wider bandpass
bass driver with the horn(s)) less of an issue? or was this one area of
compromise (apparently not much of one, given the commentary so far), or
a "feature"?

-grumpy

[Hoerninger]

A comment regarding the 2441, 375 or any other JBL compression driver. The 476Be is better in every way! It measures better in response, harmonic distortion and decay properties - period. More importantly, it just plain sounds better by a huge margin, unless you like hash, grit and false dynamics due to diaphragm breakup. We will be glad to sell you one for a cool $3500.

This has been an offer.

The white paper shows W x H x D:
965mm x 1092 mm x 464 mm
(38" x 43" x 18-1/4"),
slightly different than in the web.

The published CAD-drawings inspired me to take some measurements. There are certanly mistakes and it would be better to start with the real horns rsp. a real DD66000. But for a hardcore DIYer it might be a starting point.
____________
Peter (Posts: 100 )

[Hoerninger]

... very rare. For your convenience.
____________
Peter

[northwood]

This has been an offer.

The white paper shows W x H x D:
965mm x 1092 mm x 464 mm
(38" x 43" x 18-1/4"),
slightly different than in the web.

The published CAD-drawings inspired me to take some measurements. There are certanly mistakes and it would be better to start with the real horns rsp. a real DD66000. But for a hardcore DIYer it might be a starting point.
____________
Peter (Posts: 100 )

Wow,U r fast

[Hoerninger]

... from a korean site.
Any comments?
____________
Peter

[TimG]

I don't know how you will get an affordable horn built, but if you can find some way I'd like to try to build some. Maybe it would be easier to find an affordable way to cast some replicas of the TAD TH4003 horn.
I have a a pair of 2234H, some 2435HPL, and some 077's that I could try our for supertweeters. I have prototype woofer boxes that could be set up to approximate the woofer response. If someone can come up with a horn I could measure everything and come up with a 700Hz crossover for a system like this. I think the 2452H SL could potentially be a better candidate for the compression driver, but I certainly cannot afford $1315 for a single driver so I will have to wait until I can find some demos or refurbs on ebay for $225, the price that 2435HPL's have been selling for. The 2435H, to sound best, requires a crossover in the 9-13kHz range. I have been using them in some SRX horns and the clarity is amazing.

[speakerdave]

. . . . The 2435H, to sound best, requires a crossover in the 9-13kHz range. I have been using them in some SRX horns and the clarity is amazing.

You mean the 2381?

[TimG]

No, I'm referring to the 75x50 degree horn from the SRX715. http://www.jblpro.com/srx700/SRX700_...tion/home.html

So what I want to know is how can the VRX915M, that uses a 15" neodymium woofer and the new 2452H compression driver sell for $1349 when JBLPro parts wants $1315 for the 2452H driver alone?

[Zilch]

So what I want to know is how can the VRX915M, that uses a 15" neodymium woofer and the new 2452H compression driver sell for $1349 when JBLPro parts wants $1315 for the 2452H driver alone?

It ain't the "-SL," either. :dont-know

I don't know that slappin' an "SL" diaphragm into a 2452H gets you a 2452H-SL with a larger bolt pattern for certain, either.

In this price range, it's hard to say, "Worth a try...."

[Hoerninger]

... there seems to be a mistake:

Considering the fraction height to depth you get 1092 : 464 = 2,35. If you take the the distances from the drawing you get something like 2,5. By choosing the depth not beginning at the wooden corner but at the lips of the horn you achieve a better result, round about 2,4.

There is obviously a problem with accuracy, but the top view foto gives distances which correspond quite satisfying. There is always a problem with deformation if you take fotos. But the top view fits very well with a circle for example. I suppose the top view gives you an adequate (part of the) horizontal shape of the horn.
____________
Peter

[Guido]

Peter, are you already working at it? Where you live exactly?
You can have my 2441 with Beryllium Dia for testing.

[Hoerninger]

Moin Guido,

living in northern germany,
im wunderschönen Schleswig - Holstein.
PM follows during the day.
____________
Peter

[Steve Schell]

Although the DD66000 appears to use complex curves, it might be possible to build enclosuress that would come fairly close by using off the shelf formed plywood quarter or half cylinders. Anderson International Trading in Anaheim CA, for example, sells these parts in a wide variety of sizes.

http://www.aitwood.com/StoreFront.As...(180%20degrees)