JBL 2404H Tweeter Diaphragm Replacement

[Wrinkles]

Hello,

I have a dead JBL 2404H tweeter. Measures open on my DMM at the terminals at the diaphragm connection points.

What are the better speaker repair establishments that can replace this diaphragm?

Are some replacement diaphragms better than others? Can it get back to oriignal specs?

Thanks,

Wrinkles

[djk]

Anything other than the real JBL part is a waste of money.

If you have never replaced one before it is not a first time project.

Go to JBL and find an authorized service center near you. Send it to them.

"spitty" or "harsh"

208.252.113.176

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• Posted by

djk ( M ) on July 09, 2004 at 02:20:17

In Reply to: Re: JBL 075 posted by weltersys on July 08, 2004 at 22:41:41:

One reason this tweeter has the rep being "spitty" or "harsh" is that most of them rub.

Shim

ming both the inner and outer horn sections while using a spectrum analyzer takes care of the problem. The

shim

s needed are in the range of 0.002"~0.010".

Having said that I would dump 2402s and buy 2405s or 2404s for hi-fi.

They all need

shim

s.

The 2404 can use either the 2402 or 2405 diaphragm.

The 2402 diaphragm is twice as thick as the 2405, and has a peak at 12.8Khz, but handles more power for lower crossover points.

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• Posted by

djk

(

M

)

on July 13, 2004 at 02:37:29

In Reply to:

Re: "spitty" or "harsh"

posted by weltersys on July 12, 2004 at 23:25:11:

The diaphragm is normally left in place, make sure it doesn't rub in the gap, they usually don't (with real JBL parts).

The

shim

s go between the diaphragm and the phase plug and outer horn assembley. I cut

shim

s from masking tape using a pair of wire cutters, and stick them on top of the JBL

shim

s (which are stamped aluminum spacer rings). Use non-magnetic tweezers for handling the

shim

s.

I use 3M masking tape, its thinner and has less adhesive to squish. Usually it takes two layers for the right thickness. I

shim

both the phase plug and the outer horn in four places so they don't rock (a total of eight places).

I've seen 2405s go from ±5dB to ±1dB over their range.

The ones that rub sure play a lot louder (if you can stand the sound)!

[Coytee]

I had a pair of (working) 2404's that I presumed had aftermarkets in them. I contacted my local JBL dealer and ordered new replacement diaphragms and as best I can recall, they cost just about $200 after shipping for the both of them.

I have ZERO idea how the OEM's stack up against the inexpensive ones you see on EBAY. You can also order 8 OR 16 ohm of the same thing so be sure you're ordering what you want.