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Multi-Way Conventional loudspeakers with crossovers

Broken tweeter
Broken tweeter
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Old 6th December 2017, 08:57 AM   #1
Kay Pirinha is offline Kay Pirinha  Germany
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Default Broken tweeter

Hi,

two weeks ago I've got a pair of old two-way speakers for free. I connected them to my stereo console and they worked. Driven just by curiosity, I decided to open one of them and poke my head into it. I found two polarized (!) electrolytics (47 in parallel with 33) in the xover's 2nd order HP section and degenerated foam surroundings in the woofer. Then I lifted one leg of each 'lytic for measurement reasons and resoldered them.

Next I bought a pair of cheap (EUR 1.95) woofers of suitable diameter, same impedance and about the same magnet size, leaving open the option of refoaming the original drivers.

After reassembly, I gave the speakers a new try and immediately noted a muffled sound from the speaker that I had opened first. Further investigation led to an open voice coil in the tweeter.

What had happened here? Is this purely coincidence, as the tweeter worked first, prior to my fiddling in the xover network?

Best regards!
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Old 6th December 2017, 05:54 PM   #2
Lojzek is offline Lojzek  Croatia
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Maybe a tinsel lead broke off while you were busy managing wires. Who knows. Have you got any pictures of this fine 2 € woofer? Dynavox?
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Old 6th December 2017, 06:37 PM   #3
Kay Pirinha is offline Kay Pirinha  Germany
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I've already inspected the tweeter, it's without pathological findings . No obviously broken wires.

The new woofers are these: Tieftoner 491048021302 online kaufen | Pollin.de. Oops, they were impressive EUR 3.95...

Best regards!
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Old 20th December 2017, 09:30 AM   #4
Kay Pirinha is offline Kay Pirinha  Germany
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By close inspection I found out that the tweeters are vintage KCH25 by German manufacturer Heco. Is there any change to get new diaphragms for these?


Best regards!
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