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Blown Crossover?

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talmadge3

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Post Sat Aug 03, 2013 4:20 pm

Blown Crossover?

Apparently I just blew something in the crossover in my original amazing speakers. (upgraded with the 60" ribbons) I heard a pop, then some smoke. As a result the bottom woofer is no longer working. Here is a picture of the crossover. How can I tell if its the crossover or the woofer? Was the crossover upgraded when the 60" ribbon was installed? Can anyone tell by looking at the crossover?
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MRHP

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Post Sat Aug 03, 2013 5:00 pm

Re: Blown Crossover?

Hopefully its something simple, there will be someone along shortly that can help you out.
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angelod307

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Post Sat Aug 03, 2013 5:01 pm

Re: Blown Crossover?

If only one woofer is gone, then a woofer is the issue. A pop denotes perhaps a capacitor. At that age, all electrolitics need replacement. Poly caps , not so much. Hi and glad to meet you.
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talmadge3

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Post Sat Aug 03, 2013 6:16 pm

Re: Blown Crossover?

Thanks for the help. I see you're from SC. I'm in Charlotte. Do you know anyone that could help me with the crossovers, test rebuild, etc.?
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Chauss

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Post Sat Aug 03, 2013 7:06 pm

Re: Blown Crossover?

Check out the Polk Audio website- there are a few guys over there pretty adept at it. Cheers!
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frankieD

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Post Sat Aug 03, 2013 8:03 pm

Re: Blown Crossover?

You can have the crossover looked at but if 3 of the 4 woofers are working the problem is not the crossover.

Welcome to the forum.

PS: The woofers are available & not too expensive either.
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angelod307

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Post Sat Aug 03, 2013 8:45 pm

Re: Blown Crossover?

talmadge3 wrote:Thanks for the help. I see you're from SC. I'm in Charlotte. Do you know anyone that could help me with the crossovers, test rebuild, etc.?



yup,me.
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F1nut

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Post Sun Aug 04, 2013 2:11 am

Re: Blown Crossover?

Visually I don't see a problem with the crossover, but looking at your picture is not the same as seeing it in person. A pop and smoke would generally indicate a capacitor going bad, although I suppose you could have blown the single woofer. Can you see anything on the board that looks black and charred? Can you locate where the smell is coming from? Does the bottom woofer move in and out freely? If you have a meter, desolder the two leads to the bottom woofer and check the resistance, it should be 3.5 ohms.

Was the crossover upgraded when the 60" ribbon was installed?


From what I can make out, it would appear that the high frequency section has been changed to accommodate the 60" ribbon.
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talmadge3

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Post Sun Aug 04, 2013 6:55 pm

Re: Blown Crossover?

The woofer moves freely, does not appear to be a problem with it. I can't smell any burn nor do i see any on the crossover. Everything appears to be fine but the bottom woofer still does not work. I saw the smoke in the crossover area when it popped. So you do think the crossover was changed when the ribbons were? With caps, etc. so old would it help to have them rebuilt? It seems the speakers still need an enormous amount of power.
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mbskeam

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Post Sun Aug 04, 2013 8:20 pm

Re: Blown Crossover?

so when you play music do the other woofers work?
if so, then there you go, a bad woofer
do you test tone disk?
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angelod307

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Post Sun Aug 04, 2013 8:24 pm

Re: Blown Crossover?

optical illusion perhaps then as the crossover is right there next to the speaker
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F1nut

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Post Sun Aug 04, 2013 9:35 pm

Re: Blown Crossover?

The woofer moves freely, does not appear to be a problem with it.


Ok, next step is to check it with a VOM.

So you do think the crossover was changed when the ribbons were?


Not the entire crossover, just the high frequency circuit and yes it would have to be changed in order for the new ribbons to work.

With caps, etc. so old would it help to have them rebuilt? It seems the speakers still need an enormous amount of power.


Replacing the original crappy caps with high quality film and foil caps would be an excellent idea. Changing the resistors would be too except that none of the better ones come in the required 25 watt rating, at least they didn't years ago when I looked into it. None of that is going to change the fact that they are a bitch to power.
Political Correctness...defined

A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.



In a recent press conference, President Obama remarked, "If I had a city, it would look just like Detroit."
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talmadge3

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Post Mon Aug 05, 2013 7:07 pm

Re: Blown Crossover?

Thanks for the help and advice
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angelod307

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Post Mon Aug 05, 2013 8:49 pm

Re: Blown Crossover?

Bigger ribbon will work with older crossover but not correctly.
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talmadge3

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Post Tue Aug 06, 2013 6:49 pm

Re: Blown Crossover?

ok so you guys were right. It is the woofer, not the crossover.
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