Tweeter repair questions. - AVS Forum
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post #1 of 11 Old 10-03-2012, 11:23 PM - Thread Starter
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This is with one of my Pioneer FS51s

I think one of my tweeters is maybe blown I guess. I don't think I ever pushed it too far, and the other one sounds and measures perfectly fine.
I don't know exactly when this would have happened.
I tested all the speakers in the same spot and same location off the same speaker outputs of my AVR and the one rolls off significantly sooner.
I noticed this when running test tones for setting volume.
Also my Audyssey EQ trys to boost the higher frequencies of this speaker.

It does still produce sound throughout the entire frequency response. Just not as loud as the others.



That is measured from the exact same speaker connections and location.

I took it apart. From the start of reading a problem would be if the two connections don't measure any resistance.
Mine seems to.



Any thoughts on other potential problems?
I sent a email to pioneer but I can't imagine getting a useful response.

Is there anyway I can get an idea of what tweeter to replace this with?

Thanks

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post #2 of 11 Old 10-04-2012, 01:00 AM
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Tweeter is probably ok and problem might be in crossover. If you want to be sure, swap that tweeter to other speaker to see if it's ok.

Crossover problem might be caused by bad cap or tweeter protector circuit.
http://www.eden-electronics.com/info/articles/tweetertext.htm
If you find some kind tweeter protector component, measure if that is ok.
If you arent sure what resistance that component should have, compare it to other working crossover.
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post #3 of 11 Old 10-04-2012, 10:25 AM - Thread Starter
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I started taking apart the other one and the first thing I did was measure the impedance. its 6.1ohms.

I can't imagine they would be different on purpose?

Going to try switching it to the other one anyways.

If you look at the picture I don't think the normal tweeter repair methods(that I have been able to Google) will be viable as the coil appears to be sealed over by part of the dome.

Thanks for the great reply, learned a lot.

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post #4 of 11 Old 10-04-2012, 09:46 PM - Thread Starter
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switched everything around multiple times, definitely the tweeter.

Seems like trying to find the short in the winding might not be possible. If it is I am up for trying it.

Otherwise how do I begin planning possible replacements? I obviously must impedance match correct?

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post #5 of 11 Old 10-04-2012, 11:29 PM
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Have you tried contacting a Pioneer service center?

FWIW, I blew a tweeter on one of my JBL floorstanders. None of the local JBL distributors had what I needed. I was able to find a part number via a service manual I found on Google. Then after more Googling (and a very long back order), I obtained a replacement from Speaker Exchange online.
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post #6 of 11 Old 10-05-2012, 12:39 AM - Thread Starter
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I tried contacting pioneer support through email. Gonna try finding a service center to contact. Thanks

Edit: service center could only tell me its a "sealed" unit and they don't have parts available. And so far customer support through email simply replied with telling me to mail them to them to repair. Would cost as much to mail as buy new. Going to call them Monday and see if I can get anything else arranged.

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post #7 of 11 Old 10-05-2012, 08:01 PM - Thread Starter
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I am trying to figure out how exactly this one got damaged but can't seem to figure it out.
My amp is not capable of more than the rated power of the speaker.
4 other of these tweeters in my other speaker all measure 6ohms and sound and measure accurate. They were being driven with multi channel stereo(music) which is what I imagine has been the loudest thing I have played with my system and what would have potentially done it.
Should I just consider this a fluke?

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post #8 of 11 Old 10-05-2012, 08:34 PM
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if you clip your amp, you will be sending direct current through your speaker. that can damage a tweeter even though the amp doesn't appear to have more power than the tweeter is specified for. unfortunately, consumer amps don't have clip lights.

i suppose that it is possible that it is a fluke.

the tweeter is probably the same in the bookshelves that you are running for surrounds. you could buy another pair of them for $50-60 just for the parts. unless you can get pioneer to sell you a replacement tweeter, i'm not sure what to suggest.

Listen. It's All Good.
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post #9 of 11 Old 10-05-2012, 08:55 PM
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Doing frequency response sweeps stresses the amplifier and the speaker, so always be a little careful. I roasted the Vifa ring radiator tweeters in one of my speaker pairs doing that.

Smell the tweeter. Does it smell "burnt"? That can be a sign of overloading it.

One possibility is that you melted the voice coil or one of the contacts just a little, so it has more resistance and plays quieter now, but it still sort of works. I don't really know how possible that is, but it seems like a possible explanation for what you are experiencing and measuring.

Bottom line, it seems clear that you need to replace the tweeter.

-Max
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post #10 of 11 Old 10-05-2012, 10:50 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

if you clip your amp, you will be sending direct current through your speaker. that can damage a tweeter even though the amp doesn't appear to have more power than the tweeter is specified for. unfortunately, consumer amps don't have clip lights.
i suppose that it is possible that it is a fluke.
the tweeter is probably the same in the bookshelves that you are running for surrounds. you could buy another pair of them for $50-60 just for the parts. unless you can get pioneer to sell you a replacement tweeter, i'm not sure what to suggest.

Interesting, thank you.
That's the plan. Going to call Pioneer Monday, otherwise buy a set of bookshelves once they are on sale.

Quote:
Originally Posted by maxcooper View Post

Doing frequency response sweeps stresses the amplifier and the speaker, so always be a little careful. I roasted the Vifa ring radiator tweeters in one of my speaker pairs doing that.
Smell the tweeter. Does it smell "burnt"? That can be a sign of overloading it.
One possibility is that you melted the voice coil or one of the contacts just a little, so it has more resistance and plays quieter now, but it still sort of works. I don't really know how possible that is, but it seems like a possible explanation for what you are experiencing and measuring.
Bottom line, it seems clear that you need to replace the tweeter.
-Max

I don't think it smelt burnt, or at least any different than the other ones.(yes I smelled all my speakers)

The resistance actually measured lower on the bad one, I think from the coil shorting and the current running less length of the coil.

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post #11 of 11 Old 10-31-2012, 04:41 PM - Thread Starter
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Wow, well after only a couple phone calls.

PIoneer paid for return shipping and sent me the newer model of the speaker. I am very impressed with how they handled it.

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