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Testing reconed driver
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scott_fury View Drop Down
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    Posted: 18 June 2019 at 7:23am
Hi,

What tests should I be performing on a recently reconed driver in order to make sure there are no issues before loading them into a cab and relying on them for gigs, etc..

Thanks!
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Tonskulus View Drop Down
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Check for voice coil rubbing by hand and feed some signal to it at lowish to moderate power levels. Check that suspensions are well glued. 
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scott_fury View Drop Down
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Points: 319 		Post Options Post Options   Thanks (0) Thanks(0)   Quote scott_fury Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2019 at 7:01pm
Originally posted by Tonskulus Tonskulus wrote:

Check for voice coil rubbing by hand and feed some signal to it at lowish to moderate power levels. Check that suspensions are well glued. 


Thanks Tonskulus. I’ve reconed a driver before and found that if I pushed the cone the voice coil rubbed, but pushed the dome and it didn’t. Pushing by hand feels a bit hit and miss.

Does it matter what frequency to put through it? For example, the FS of the driver?
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Tonskulus View Drop Down
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Try something like 15-20Hz. Just to get cone moving about 10mm (do NOT exceed Xlim value!), if you hear any rubbing sound its not ok. Keep in mind that voice coil cooling holes may keep some noise..

Yes, voice coil may rub if you push the cone from one side only. 


Edited by Tonskulus - 18 June 2019 at 8:28pm
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scott_fury View Drop Down
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Thanks for the advice.
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Chris Grimshaw View Drop Down
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Originally posted by Tonskulus Tonskulus wrote:

Try something like 15-20Hz. Just to get cone moving about 10mm (do NOT exceed Xlim value!), if you hear any rubbing sound its not ok. Keep in mind that voice coil cooling holes may keep some noise..

Yes, voice coil may rub if you push the cone from one side only. 

+1.

FWIW, I also test new drivers like this, just to be sure. Turning the volume up briefly means you can push to the mechanical limits (drivers tell you when they're distressed) without worrying about cooking the coil.

Chris
Quality sound from Sheffield
www.grimshawaudio.com
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