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Tweeter protection

Hello, I have a few sets of B&W 800 series speakers and I'd like to install an inline fuse to protect my tweeters. My question is; should I go with 125v or 250v 1 amp fuse? Open to suggestions.Thanks

128x128danmar123
mijostyn's avatar
mijostyn
8,570 posts
 

@danmar123 

Why do you want to do this? How did you come up with the 1 amp rating? As for the voltage it makes no difference in a loudspeaker, but you might as well use the 250 volt fuse. The main issue is the amp rating. I would check with B+W and find out how many watts the tweeter is rated for then you can do the math and come up with a figure. 

mijostyn's avatar
mijostyn
8,570 posts
 

I should also mention that depending on the frequency of the overload the tweeter can wind up protecting the fuse.

danmar123's avatar
danmar123 OP
450 posts
 

Thanks. Will do.

erik_squires
16,126 posts
 

1 A seems a little low. https://www.rapidtables.com/calc/electric/power-calculator.html

Though honestly not sure that anyone would use a tweeter protection circuit anymore. Depends on the rest of the crossover. If the HP filter is low order (i.e. slow rolloff) then it’s more critical, assuming you aren’t trying to overpower the speakers or overdrive the amplifier to begin with.

AFAIK, a lot of the cylindrical fuses do both 120 and 250V, the important part is the current in this case, as the voltage from one side of the fuse to the other is nearly identical. That is, you wont’ have 120V across it, and frankly 120V is already overkill, so make yourself happy.

120V across an 8 Ohm tweet is about 1800 Watts. :D 

erik_squires
16,126 posts
 

Also, depending on the exact model, you may find yourself better off with a complete crossover replacement.  Troels Gravesen among others does a great job of re-thinking the originals from a blank sheet of paper and it's a much better idea than part swapping.

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