JBL 2450 with Truextent vs TAD 4001?

[neskor]

I need your help.
Still deciding what is best thing to do.
Anybody had a chance to compare JBL 2450 loaded with Truextent diaphragms vs TAD 4001?
What you will choose?

[cosmos]

I need your help.
Still deciding what is best thing to do.
Anybody had a chance to compare JBL 2450 loaded with Truextent diaphragms vs TAD 4001?
What you will choose?

We did not listen to the Truextents in 2450, they were in either 2441 or 2445. However, when compared to TADs, I'd give them a slight edge. Others in the group might give the Tads the nod, but in any case, it was close. Very close. I don't think you could lose with either combination.

[Mr. Widget]

I've heard both, but not at the same time... so I can't make a useful comparison. As cosmos said, I don't think you would be making a mistake with either assuming the TADs are up to spec and the Truextent's are properly installed in the JBLs.


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[neskor]

I had some bad experience buying old and (ab)used Alnico drivers.
Unfortunately there is no recharge service in my country
Maybe is better and safer to go with neodymium magnet.

[Mr. Widget]

Maybe is better and safer to go with neodymium magnet.

If you don't have the drivers yet, and you choose the JBL route, you can safely go with ferrite. They are larger and heavier, but they also are less costly. I would go with the 2446 if I wanted a 2" throat.


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[pos]

Guido recommends the Radian 950PB driver which is supposed to be better thanks to its 5-slit phasing plug. He also sells 950PB drivers with truextent diaphragms installed

I am running truextent 16ohms diaphagms in 2450 cores and I really like what I hear and measure, much improved over Ti and Ti SL diaphragms. They require some compensation in the high tho: if you want to run them with a passive filter it would probably be much easier to use a Ti SL diaphragm or a TD4001...
What you get with the truextent is a very efficient mid/high band, and a really well behaved (but rolled off) top end. The milar surround certainly has much to do with this.

[neskor]

What you get with the truextent is a very efficient mid/high band, and a really well behaved (but rolled off) top end. The milar surround certainly has much to do with this.

My plan is to use 2405 above 10KHz

[4313B]

Guido recommends the Radian 950PB driver which is supposed to be better thanks to its 5-slit phasing plug. He also sells 950PB drivers with truextent diaphragms installed

Very tempting! Too bad it has the wrong brand name stamped on the back.

[1audiohack]

The first ones of these I got my hands on, serial numbers in the 300's would not run rub free in the 2441's I had either, noway, nohow. Having carefully measured half a dozen of these I can tell you that the concentricity is much better on the later assemblies and as hard as it is to measure something so fragile and flimsy as a voice coil the later ones are about 0.010" smaller overall. There should be no problem if they don't rub, either they do or don't. The early ones went, measured, run and sound fine in the 2450's.

[Mr. Widget]

The first ones of these I got my hands on, serial numbers in the 300's would not run rub free in the 2441's I had either, noway, nohow. Having carefully measured half a dozen of these I can tell you that the concentricity is much better on the later assemblies and as hard as it is to measure something so fragile and flimsy as a voice coil the later ones are about 0.010" smaller overall. There should be no problem if they don't rub, either they do or don't. The early ones went, measured, run and sound fine in the 2450's.

Good God man... How many Be diaphragms do you need!



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[spkrman57]

If you don't have the drivers yet, and you choose the JBL route, you can safely go with ferrite. They are larger and heavier, but they also are less costly. I would go with the 2446 if I wanted a 2" throat.
Widget

I have Be diaphrams in my 2446's mounted on 500Hz tractix Edgarhorns and use them on top of my 2226's and they sound great, at least to my ears! I used to have them on my 350Hz Edgarhorns shown in my avatar.

Regards, Ron

[ivica]

I had some bad experience buying old and (ab)used Alnico drivers.
Unfortunately there is no recharge service in my country
Maybe is better and safer to go with neodymium magnet.

I think that 2446 -"motor" would be cheaper and appropriated solution, while the diaphragms would be another "story". At the end I think that desired horns would be of great influence to the total sound experience. Old 2311 with 2308 would be a good starting point if the speakers are intended for "home listening" but, with some kind of mid-bass support (such as: 2122, 2123, 2202,....).

http://audioroundtable.com/forum/pdf.php?th=16472
Upper link very interesting for reading.


Using 2405 (or something the same) would be "a must" in any case

[neskor]

I have some plots of JBL 2450j with Truextent diaphragm from German magazine.
Is it ok to post results here or is that forbidden?

[Mr. Widget]

I have some plots of JBL 2450j with Truextent diaphragm from German magazine.
Is it ok to post results here or is that forbidden?

As long as you realize any copyright infringement is by the poster not the Forum.


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[neskor]

Here it is.
I hope nobody will sue me