Ring Radiator Comparisons

[pos]

VERY interesting, thank you grumpy!!

could you try adding a LE25 foam pad on them?
maybe that would suppress that 8khz off axis peak (in both plans)?

here is what Widget did mesure (without 0° normalization) :

[pos]

also, here is the L220 directivity measurement (from the brochure...)
It is said to be 90x45 at 12khz
(the 076 starts at 5khz)

[grumpy]

My measurements don't seem to support the brochure directivity plot,
(at least the 5KHz+, 076-specific portion, understanding that the LE5
will have increasingly less output beyond that frequency)...

...but then I don't claim to have knowledge of the procedure used at JBL,
and I don't recall what threshold (-6dB, -10dB, ?) might have been used
to define angular coverage (neither seem to fit consistently).

I put a mic directly ~1m over the DUT, rotating the DUT in place, keeping
the center of the face directly below the mic (just tipping it, without
recentering, would add an error to the measured angle).

Also, the DUT was not on a baffle ... (Device Under Test). To be a valid
comparison vs. the brochure, one would need to create a similar environment
(baffle size and mounted driver location, and rotate the unit/baffle).

Given all that, I'll see what kind of foam I might have available to test
your hypothesis.

[Allanvh5150]

The lens on the 220 was on the LE5 was it not?

[pos]

The lens on the 220 was on the LE5 was it not?

Yes it was. The part in the graph we are interested in is past 6khz

[4313B]

If I find some foam to cut up, I might try some "backyard experiments"

Happy to take questions/comments/criticism.

Given all that, I'll see what kind of foam I might have available to test
your hypothesis.

You could just sell them for vast sums of cash and make them someone else's problem.

Then buy a nice pair of 077/2405's and call it done.

[boputnam]

Tracking between 5-10KHz appears reasonable for 30 year old drivers.

Yeah - not bad at all for that age. Above that, not so much...

[grumpy]

OK, ok... I'll just do the one more test for POS-terity (I hope mangled
puns translate).

[Ducatista47]

Just read this thread. In the spirit of just listen to it, I used the slot for years with nothing but listening pleasure. The bullet has given me instant listener fatigue every time. I won't have one in the house.

Of course there might be some suitable application for it. A 25mm soft dome Audex matches up well with my twelve inch full range driver. Perhaps the bullet matches up well with a cat getting its tail stepped on.

Caption of the picture: "Well named. Paladin would have put a bullet through it alright, to put it out of its misery."

Clark

[IsakAlexander]

Well can any of you experts tell me what this is?


It`s the one 2404 I`ve got, the other two will arrive in 14 days or so. Guess I`ll need new diaphragms for all of them.

[grumpy]

Thanks for the post... reminded me I was supposed to run a test for POS.

[toddalin]

Well can any of you experts tell me what this is?


It`s the one 2404 I`ve got, the other two will arrive in 14 days or so. Guess I`ll need new diaphragms for all of them.

Looks to me like a 2404 magnetic assembly and phase plug with a 2402 diaphram that looks aftermarket.

[Allanvh5150]

Of course there might be some suitable application for it. A 25mm soft dome Audex matches up well with my twelve inch full range driver. Perhaps the bullet matches up well with a cat getting its tail stepped on.

Probably one of the longest produced drivers in history. I am sure the maketing people at JBL can tell you more than a few useful aplications. As for the Audex soft dome, I can give you a few very useful applications for it.

[pos]

Thanks for the post... reminded me I was supposed to run a test for POS.

[IsakAlexander]

Well the bargain I got from ebay turned out to be dissapointing. This is what the diaphragm looked like and this was supposed to be the good one:



Is it aftermarket or original and if so what type?
Looks like I will have to get 3 new ones