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Speaker protection system
h20
post Apr 4 2013, 17:18
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I decided to build a good protection system for my speakers. Can somebody suggest me a good speaker protection system? Is it possible to use Varistors for protecting speakers against surge voltages?

This post has been edited by h20: Apr 4 2013, 17:19
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markanini
post Apr 4 2013, 18:27
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Maybe consider a passive limiter or soft clip circuit on the power amp
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Arnold B. Kruege...
post Apr 4 2013, 20:22
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QUOTE (h20 @ Apr 4 2013, 12:18) *
I decided to build a good protection system for my speakers. Can somebody suggest me a good speaker protection system? Is it possible to use Varistors for protecting speakers against surge voltages?



Fuses work pretty good.

The varistor-like device that is used for speakers is called a polyswitch

http://www.parts-express.com/cat/speaker-p...ion-devices/307
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MikeFord
post Apr 9 2013, 06:20
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QUOTE (h20 @ Apr 4 2013, 09:18) *
I decided to build a good protection system for my speakers. Can somebody suggest me a good speaker protection system? Is it possible to use Varistors for protecting speakers against surge voltages?


Common sense seems to work pretty well. What exactly are you wanting protection from? Surges like lightening, or accidental high levels?

Varistors aren't very practical devices for speakers, voltage range isn't well suited, and once fried they do nothing.

Quad had an effective circuit for there ESL speakers with I think a triac that would ground the input above a certain voltage, but some amps didn't like it.

Fuse isn't a bad option, but to be effective might require a fuse for each driver. A thermal switch on the woofer might work as well. Weakness of a fuse is that it may not protect short duration or frequency specific overloads.
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