celestion a2 tweeter blown or not

I have a Celestion A2 floor standing speakers, both tweeters are now silent after I hooked them up to a Karaoke system and started to sing ;^(. I took them out of the enclosure and looked inside particularly at the diaphragm, they both look intact, clean and undamaged. What can be wrong with my speakers ?

Any idea for how to fix it ? Looking for original parts might be a dead-end since these models have been discontinued for years.

Both the Midrange and Woofer still sound very good, seems not being affected. I don't know if anything in the cross-over might cause the tweeter to not being able to function.
Do you have a meter to check continuity? Should NOT be zero and any greater than 8 or 10 ohms is suspect. Someone may be by with the real spec.
zero ohms is a short. Check speaker only, out of circuit.

Is there a fuse somewhere in the tweeter circuit?

Were the speakers plugged or unplugged with the circuit 'hot'? A brief spike can have high amplitude and come and go so quickly you may only hear a brief 'chirp'.

How bad is your singing? just kidding. Mine is worse.
Contact Celestion USA on this link for help:
Good luck
Vinh Vu
First, thanks for all the responses. I really appreciate them all.

I looked at the crossover circuit board, it looks very clean, no altered color and no smell, I did not see any fuses there.

I am a nobody when it comes to electronic stuff, so I guess, tomorrow I will bring the tweeter to a speaker repair shop to see where the problem is. Hopefully, it is something trivial.

My other alternative is to look for "compatible" 1" diaphragms on line, and try to re-use the Celestion housing but right now I am not sure if that is where it failed.

By the way, I am in Austin, TX, if you know any decent speaker repair shop, please let me know. I just pick it out of random. There are not many of them though.
Measured the tweeter and all are zeros ohms. So they are blown. Looks like the hair line tiny coil is broken off. I wonder if replacing only the diaphragm part of the tweeter is good enough or do I have to replace the whole thing, diaphragm plus the magnetic metal part.

I just try to make sure after the repair, the great old sound can be salvaged as much as possible.
Got them replaced by F-series tweeters as suggested by Celestion/KEF of America. Sound acceptably OK. Able to retain the housing, so outside will look unchanged. But inside, behind the housing, the tweeter is one piece, you cannot separate the diaphragm from the magnets, and does not look as impressive as the old one since the new one is pretty small and of different material. The faraday ring from the old tweeters were partially reused and clipped on top of the new tweeters.

Just some info for those who have to fix Celestion A series like mine. Hope this helps.

The cost of two tweeters is approx $60 plus $40 labor for the pair.
This week I was lucky to find 2 pairs of Celestion 5 for a price of $30 for both, locally through Craigslist, both have the tweeters in very good shape. I used one pair of tweeters to replace the F-series currently installed in my A2. The other pair, I use it in another room and also keep it as a backup just in case.

Thanks to info from this forum, in deed the tweeters are identical, except that the A2 tweeter has a Faraday ring that the C5 does not. Other than that, they are the same.

Just remove the diaphragm from the C5 and re-use the magnet from the A2. The speakers now sound sensational like before, which is far better than the cheap F-series tweeter that I temporarily installed earlier on.

This is what I did to remove the diaphgram. First I removed the 3 inner cricle screws to allow me to detach (lift off) the magnet, but still keep the housing on the diaphgam, then I used a hairdryver and turn it on to high, then blow it on the housing side surrounding the diaphragm, but not on the coil, just do it for about 10 seconds, not longer just to be sure not to overheat it, the heat caused the glue to melt and allow me to easily peel off the diaphgram from the housing.

After that, it is just a simple task to mount it back on the A2 and reused the magnet of the A2 that has the Faraday ring.

Before starting, be very careful to mark which side the positive is. Also the magnet is extremely strong, it can suck up the screws and metal pieces, so keep those far away. Also try to blow off the dirt during the work to keep the diaphram clean.

Voila, a good pair of A2 speakers again.
I'd like to correct an earlier post that said the faraday was reused, actually, it was only a piece of wood that allows the F-series tweeter driver part which is of different size, very small and not thick enough to be clamped on by the old metal bar.