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Old 22nd January 2007, 09:49 PM   #1
Skorpio is offline Skorpio  Denmark
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Default Loudspeaker protection...

Can a series fuse of say 5A protect speakers from damage from amplier fault?

I want to protect my speakers during DIY changes as simple as possible.....
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Old 22nd January 2007, 09:52 PM   #2
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No, Highly reccomend building a proper spkr protect ciruit with a spkr cutout relay.Similar to
http://sound.westhost.com/project33.htm.............;)
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Old 22nd January 2007, 09:54 PM   #3
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Agree, Xeaglekeeper! A big NO!

(And the fuse produces audible distortions too...)
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Old 22nd January 2007, 10:59 PM   #4
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Quote:
Originally posted by sixtek
(And the fuse produces audible distortions too...)
Care to explain that?


Also look up a uPC1237HA IC, it's an speaker protection, anti thump on-off, and more.
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Old 22nd January 2007, 11:47 PM   #5
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That is a neat chip! Thanks ifrythings.
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Old 23rd January 2007, 12:25 AM   #6
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Have you used it?
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Old 23rd January 2007, 03:31 AM   #7
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Quote:
Originally posted by XEAGLEKEEPER
Have you used it?

Not yet, but I do have 10 of them on my bench staring me down so I will be using one of them for my mosfet power amp from ESP.

I have a Clarion car amp schematic that uses one of them for the protection, but they don't use an output relay.
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Old 23rd January 2007, 03:42 AM   #8
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ESP P101 "They Rock"
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File Type: jpg esp.jpg (31.0 KB, 397 views)
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Old 23rd January 2007, 06:26 AM   #9
Skorpio is offline Skorpio  Denmark
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Why does a fuse not protect sufficient?

Why do speaker woofers burn with DC?
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Old 23rd January 2007, 07:34 AM   #10
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Quote:
Originally posted by Skorpio
Why does a fuse not protect sufficient?

Why do speaker woofers burn with DC?

The fuses are too slow, they take time to heat up and then snap the wire in it glass tube. As were a protection IC can do this 1000 (or more) times faster then a fuse can It also doesn't need to be replaced, it's not prone to nucense blows and can trip at 1V offset or less(as were a fuse requires many volts before it opens).

A speaker is a AC device, to put it basicly if you put in 1W of audio signal(AC) into a speaker, it will put out 1W of sound vibrations (this is extremely simplifed) but if it gets DC all it can do it pop in or out and the 1W of DC (for example) will turn into heat and not sound waves. If the DC is Large enough the speaker will be damaged before the fuse even knows whats happening.
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