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Old 16th March 2012, 11:06 AM   #1
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Default How do fuses affect the sound quality?

I have a pair of nice Infinity RS-2001 studio monitors with a much more powerful amplifier. A few months back I accidentally blew my tweeters and had to replace them--fortunately I found a good pair for $40 that are identical.

Now I am thinking about putting a fuse between the speaker and amplifier to limit the input current to protect them.

Would this noticeably affect the sound quality? I rather risk not having a fuse than sacrifice sound quality.

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Old 17th March 2012, 06:43 AM   #2
system7 is offline system7  United Kingdom
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Location: Portsmouth UK
A fuse is not a bad idea if your speakers get abuse at parties and such, getting driven into distortion and clipping where everyone is too drunk to notice. The idea is to put them before the tweeter crossover to protect the amp and the tweeter.

The KEF T27 tweeter used a 0.5A slowblow. A modern Time-delay would probably do the same sort of thing. A quickblow would probably pop irritatingly often.

As for the sonic effect, well, you probably would only notice it at high levels where the fuse gets hot. It'll be a sort of slight compression. But frankly, the tweeter voice-coil and crossover components are going to show a similar effect anyway.
Best Regards from Steve in Portsmouth, UK.
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Old 17th March 2012, 02:39 PM   #3
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Raychem/TE Connectivity RXE050 0.50A Polyswitch 071-254


Polyswitches have a base resistance, here probably ~1R,
that increases rapidly beyond a certain temperature. If the
speakers have a tweeter series resistor ideally you should
reduce it a little if you want to keep the same treble level.

rgds, sreten.
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