Truextent Diaphragms in JBL four-inch compression drivers

[4313B]

The TAD schematic Ian provided with the data I measured:

[spkrman57]

I will have my new "Cosmos" horns, which are really good.

Dan,

Pics of the "Cosmic" Tractix horns are needed to be added to this thread immediately!!!

Ron

[Dingusboy]

The TAD schematic Ian provided with the data I measured:

Thank you very much for posting this information.

Thanks also to Ian for providing the time clocked schematic.

[cosmos]

Dan,

Pics of the "Cosmic" Tractix horns are needed to be added to this thread immediately!!!

Ron

For reference, here they are resting on 4507 cabs with E145 and zilch plugs..

Made from compressed cosmic dust (Poplar) and a right handed, smoke shifting calavicator (secret hammer):

[Zilch]

They sound alot better than they look but you should see a waveguide/476Be curve.

Let's SEE it!

[And how a 2452H with TruExtent diaphragm performs on the same waveguide.... ]

[Ian Mackenzie]

Huh,

Unless its dead flat its useless!! Throw it out.

(the 2446 is obviously different to the 4001)

Might need some optimisation.

[4313B]

Let's SEE it!

[And how a 2452H with TruExtent diaphragm performs on the same waveguide.... ]

I sold all my waveguides to guys that couldn't buy them from JBL Pro directly (overseas). And I don't have any 2452H's anymore either.

Huh,

Unless its dead flat its useless!! Throw it out.

(the 2446 is obviously different to the 4001)

Might need some optimisation.

I thought it looked quite good. It's perfect for someone with a 3 dB peak in their hearing at 2.2 kHz! And yes, it can probably be optimized for the 2446.

[Mr. Widget]

I thought it looked quite good. It's perfect for someone with a 3 dB peak in their hearing at 2.2 kHz! And yes, it can probably be optimzed for the 2446.

Interestingly Tom Holman designs just such a dip into his Audyssey software.

What impressed the hell out of me was that impedance plot.


Widget

[4313B]

What impressed the hell out of me was that impedance plot.

Yep.

[kegger]

With the other compensation circuit I'll be curious if we feel the need for a little extra extension
at the "extreme" top, regardless of ones hearing ability out there, that extra there can really add
to frequencies one can hear, little bit of air and or shimmer could be wanted in those upper octaves.

I'll get to hear it soon enough and find out if it seems lacking..

[Zilch]

I sold all my waveguides to guys that couldn't buy them from JBL Pro directly (overseas). And I don't have any 2452H's anymore either.

I have all that stuff, of course, and there's a 476Be local here.

All "we" need is some TruExtent (which is also local) diaphragms.

[I will inquire.... ]

[Ian Mackenzie]

Interestingly Tom Holman designs just such a dip into his Audyssey software.

What impressed the hell out of me was that impedance plot.


Widget

Agreed,

Its far better damped than a the simple series LCR network commonly used like that in the 4344 and some PA Cd crossovers.

[4313B]

Let's SEE it!

[And how a 2452H with TruExtent diaphragm performs on the same waveguide.... ]

I have all that stuff, of course, and there's a 476Be local here.

All "we" need is some TruExtent (which is also local) diaphragms.

[I will inquire.... ]

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

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.

[timc]

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

Maybe you could bribe JohnW to make you a pair

[4313B]

Maybe you could bribe JohnW to make you a pair

There's no way that I know of to get a model of one.