Fusing Speaker Outputs

Aaron407
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Hey everyone, sorry if this has already been asked:

I want some extra protection against blowing my subs, so I'm fusing the speaker outputs on my amps. I want to use a 7.5A inline fuse with a 4ohm sub. With P=(I^2)*R, this should theoretically limit the power to 225Wrms. Is this a correct assumption, or are there other factors to incorporate?

407

 
Fuses were used in the old days to protect speakers from catastrophic amp failures. Like shorted output transistors that would put DC on the voice coil and burn them out. Modern amps have fast acting protection circuits that shut down the power supply for those kinds of failures. Fuses are not needed.

 
One of the amps I'm using doesn't have a protection circuit. Anyway, why would it take several minutes at 450 watts rms? Shouldn't the fuse blow when the current exceeds the fuse rating? Sure they're slow blow fuses, but I don't understand how it could take minutes.

 
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