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Multi-Way Conventional loudspeakers with crossovers

Crossover crackle
Crossover crackle
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Old 1st July 2017, 02:59 PM   #1
HumbleDeer is offline HumbleDeer  Belgium
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Default Crossover crackle

Hi!

I recently finished building my Tango MT loudspeakers, but I'm having a little issue with one of the crossovers.

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.

I'm not exactly sure what the issue might be but I suspect a damaged component. What would be the most likely to fail, so I can check? I hope at least that RMA will cover it :')

Thanks,
Anna

PS: the top side, which you can differentiate, is the High-pass section. The top view is in reverse. On the top view, the big coil, the long cap and the coil next to the cap are the Low-Pass. The other coil, and the resistors & capacitors are the High-pass there.

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Last edited by HumbleDeer; 1st July 2017 at 03:07 PM.
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Old 1st July 2017, 03:23 PM   #2
HumbleDeer is offline HumbleDeer  Belgium
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As an add-on: here are some samples from DJ Snake's You Know You Like It (it's a remix) that especially trigger the crackle.

I'm also using a perfect iNuke 1000DSP for the powering of them. It's certainly the crossover.

https://mega.nz/#!vYxHSCzb!TNy7qDQNx...GY-fqEXJXxn64k

Last edited by HumbleDeer; 1st July 2017 at 03:25 PM.
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Old 1st July 2017, 03:31 PM   #3
scottjoplin is offline scottjoplin  Wales
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Hi Anna. That's a bugger, at least it's not the tweeter. Most likely one of the two tweeter caps, I'd swap them over one at a time. I presume you've checked all the joints and wiggled the components a bit whilst listening?
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Old 1st July 2017, 03:51 PM   #4
HumbleDeer is offline HumbleDeer  Belgium
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I can't do that whilst listening because they're closed, but they're all solidly soldered in place. By switching do you mean switching from #1 to #2 and when it switches over requesting RMA for the one that changed it?
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Old 1st July 2017, 04:00 PM   #5
scottjoplin is offline scottjoplin  Wales
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Yes, switch over the caps between the crossovers one at a time and see when the problem shifts over. But first, how about when you have the problem crossover out, connect it to the tweeter only and have a good wiggle and poke about at all the components, you never know, it might save you a bit of time locating the fault
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Old 1st July 2017, 04:12 PM   #6
HumbleDeer is offline HumbleDeer  Belgium
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i'll connect a spare tweeter then. Just to make sure I don't damage my expensive tweeters.
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Old 1st July 2017, 04:15 PM   #7
scottjoplin is offline scottjoplin  Wales
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Good idea, have you any spare caps?
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Old 1st July 2017, 04:27 PM   #8
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by HumbleDeer View Post
I can't do that whilst listening because they're closed, but they're all solidly soldered in place.
Put them out, and well away...I mean, isolated.
Edit.You don't have to twist the cable...Well, I have mine twisted but I bought it like that (with some nylon chord to keep the cables tight and at the same distance...clever! But nahhh.. )
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Last edited by picowallspeaker; 1st July 2017 at 04:29 PM.
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Old 2nd July 2017, 10:38 AM   #9
HumbleDeer is offline HumbleDeer  Belgium
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I don't have spare parts, no. That's too expensive. I'm having a hard time finding out if it's actually my tweeter or my crossover, and it's so much work to change around a tweeter every time or a component and screw everything back in.
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Old 2nd July 2017, 10:54 AM   #10
bentoronto is offline bentoronto  Canada
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Crossover crackle
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Originally Posted by HumbleDeer View Post
i'll connect a spare tweeter then. Just to make sure I don't damage my expensive tweeters.
Disconnect all the drivers and connect almost anything reasonably robust (including one of your woofers) to one tweeter output at a time.

If you still hear it, connect that driver directly to your amp output.

Can you pin down if some particular musical passage triggers the problem?

B.
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