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Multi-Way Conventional loudspeakers with crossovers

Crossover crackle
Crossover crackle
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Old 2nd July 2017, 03:42 PM   #31
system7 is offline system7  United Kingdom
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I think you might have a dry joint on one of the coils, or possibly a capacitor or resistor:

Quote:
On the prototype I built I heard the tweeter crackle like clipping, in the pattern of "the lack of dithering". However, when switching the crossovers around the sound followed along to the other speaker. The one troublesome crossover also has some weird harmonics that sound like a damaged diaphragm.
Click the image to open in full size.

You know you must scrape the enamel off coils wires and tin them well... they are tough as old boots and rarely fail. As are resistors. Capacitors are more fragile with excessive heat. The chocolate block connector is not the most reliable thing in the world either. FWIW, those spade or ring (what do you call them?... ) connectors sometimes don't make a great connection either. Tighten them well.
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Last edited by system7; 2nd July 2017 at 03:46 PM.
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Old 2nd July 2017, 04:05 PM   #32
scottjoplin is offline scottjoplin  Wales
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Those are ring terminals, spade terminals look like.........er.......a spade
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Old 2nd July 2017, 04:13 PM   #33
mondogenerator is offline mondogenerator  England
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Default Just a thought

I've had a similar experience before and found it highly frustrating.

Try loosening the fixing screws around the tweeter faceplate by a turn or so.

My crackling issue was caused by over tightening these screw and distorting the tweeter frame....
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Old 2nd July 2017, 04:20 PM   #34
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by system7 View Post
Tighten them well.
Take 'em off!
Everything
Just a thought: keep the tw well isolated too

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Old 16th August 2017, 06:04 PM   #35
HumbleDeer is offline HumbleDeer  Belgium
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Quote:
Originally Posted by system7 View Post
I think you might have a dry joint on one of the coils, or possibly a capacitor or resistor:



Click the image to open in full size.

You know you must scrape the enamel off coils wires and tin them well... they are tough as old boots and rarely fail. As are resistors. Capacitors are more fragile with excessive heat. The chocolate block connector is not the most reliable thing in the world either. FWIW, those spade or ring (what do you call them?... ) connectors sometimes don't make a great connection either. Tighten them well.
I'm actually aware of the enamel. I would've removed it if it weren't for Jantzen Audio helping out the true beginners that wouldn't know by pre-tinning the leads. Trust me on soldering. I'm an advanced electronics maker and breaker. Just not in audio-grade as far as electrical knowledge goes.

Quote:
Originally Posted by mondogenerator View Post
I've had a similar experience before and found it highly frustrating.

Try loosening the fixing screws around the tweeter faceplate by a turn or so.

My crackling issue was caused by over tightening these screw and distorting the tweeter frame....
This can't be the case, as the tweeter's face plate is completely separated from the main frame.

I nailed it down though: The tweeter's voice coil gap has defects. Apparently I'm not the only one. The RS28-A is, supposedly, notorious for voice coil rubbing.
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Old 16th August 2017, 07:56 PM   #36
sesebe is online now sesebe  Romania
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So you find a defective tweeter?
Or just consider tweeter defective because other had problems with it ?
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Old 16th August 2017, 08:11 PM   #37
HumbleDeer is offline HumbleDeer  Belgium
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I consider it defective because I actually took Diaphragm A from Tweeter A and put it in tweeter B, and it still scratched. I hooked up my ND-series tweeters from something else and it went completely away.

I already am way past the switch-crossover-and-see-if-problem-switches stage
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Old 16th August 2017, 08:42 PM   #38
sesebe is online now sesebe  Romania
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I did not understand your test exactly but if you are convinced of this I do not want to change your belief
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Old 16th August 2017, 08:43 PM   #39
HumbleDeer is offline HumbleDeer  Belgium
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What I did:

Took out tweeters, used different tweeters: problem gone.
Conclusion: one of the original tweeters is damaged.
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