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2425/2416/2415 dia fits 2417, but not vice-versa.

2417 dia is shallower, and hits phase plug of 2425/16/15 before the coil is in the gap. If You try to force it, damage is inevitable.

I think I have some tinsel wire (flexible wire that is made exactly for that purpose)
of the appropriate crossection. I just need the address.
Couple of inches should fit in a normal letter...

The strip is made of berillium copper alloy. Should be easily solderable.
Simplest method is to solder the strip at the break.
That will allow You to determine if that is the only damage.

Thin...

Do You have exact measures? Weights and thicknesses?

You are right, I didn't take notice of that fact. But existance of P and S is negative in any steel. So we can maybe say "very good" ordinary steel.... :)

Element contents are usually expressed in wt. percents, not atomic..

0.23 pct is a usual construction steel..
For 1-1.4 Tesla gap field, nothing more fancy is needed.
Armco iron goes up to...

You will never see "Bare" Neo material in any of the industrial uses. NdFeB material is very susceptive to corrosion, so it is always plated or covered in epoxy.
Bare Neo material looks like gray...

More10,

Sorry, I can't use Your invite. Currently I am using Dropbox for a commercial project ( unrelated to my work at uni) ,

and last time I tried to connect to somebodies other Dropbox, I...

Earl,

Thank You for Your comments. I am aware that I need to change the way to present my graphs. I am new to this forum, so....

I will try to solve that problem in the following days. Maybe...

@ 4313B Thanks for the photo. When I received the drivers I forgot to measure and note the dimensions of the foam inserts.
The type in this case was the one on the left; simple round piece. Could...

It is usually said that the experiment which shows exactly what is expected, is useless. You can't learn anything from it.

If however, results differ from expectations, it can mean only two...

Ivica, (and others ) ;

Now I have a new 1 " PWT, attached to the 2425H driver. In fact two drivers....
Drivers are with close serials, with two original JBL dias.
Two FRs are so close that I...

Download ARTA program from

http://www.artalabs.hr/download.htm

It is a fully functional, sufficient, and free loudspeaker measurement program.

Ivica, I agree, just ..... I do not accept any generalizations withouth checking...

But this dip really dees reflect to the impedance curve....
Look up my first post with impedance graph...:)

Thanks... Just my two cents. A cheap way to get an audible difference. I know that some people give an arm and a leg for much smaller improvement.

The "leak" is not a really a leak through......

Ivica,

Yes, my project started as a hobby effort, but now I am getting more and more involved.
Solving the problem of HOM in tweeters is indeed worth a scientific project,
and it wouldn't be...

Ivica,

It is in fact much easier to make a PWT than to do a proper measurement setup with speaker and microphone on the stand.
In a "normal" measurement You need a quiet place with some free...

So here are results of the next experiment.
After trying several times more, I chose next combination
:2402 dia, big (1.71") phase plug, remounted it several times
and got the same FR, within 1...

Here is a plot of FRs (2404H or H-1) recorded with the same magnet structure, the same inner parts of the horn,
and the same PWT (to avoid positioning and angle problems with usual FR recording)...

PP hole depth is irrelevant, and probably just a production variance. Phase plug is stopped from going further in by the inner diaphragm ring.
None of the pole plugs, if correctly installed...

Both diaphragm shapes ( V-angles) are identical. Different ring dimensions create different area of the flat portion of the dia surface.
It also changes the total mass, and total suspension...

Biasing is needed only for electrolytic caps, so that they never experience reversed polarity on their terminals.

9 volt is in fact insufficient. higher is better, but then You need higher voltage...

In Fact Be is not that rare... And it takes a gram or so in every dia to be produced. The problem is Be toxicity.... It is treated as hazardous material, not exactly as plutonium, but close.
Every...

Could You say something about DS-1428.. I am interested in TS parameters: Mmd, BL Le etc... Could You reveal at least that?

FR of 2404H-1 on a 1/2" 6' PWT.

No damping, just impulse response gated at 10.5 milliseconds

three lines:

1. Open tube end, (Yel)
2. Closed tube end (Rosa)
3. Last 8in damped with a loose...