[Tone Depth]

Is there a formula or an online calculator for selecting the appropriate speaker protection fuse amperage, when I connect various speakers to my AVA amplifier? My interest is selecting fuses based on the maximum power rating for a speaker, so to not overdrive a speaker.

[TomBo]

Hey, not a direct answer but hopefully a good data point. Have yet to damage a speaker using AVA gear with the fuses that shipped from the factory .  I had to replace the speaker fuses once in my old Fet Valve amp...blame me for pulling speaker wires while the Amp was fully energized...glad it was only the fuses...

[hawkmoon]

Perhaps this will help:
https://avahifi.com/pages/fuses?_pos=1&_sid=e85fec0a1&_ss=r

Some people use aftermarket fuses as well for improved performance.

[Rusty Jefferson]

There are formulas for the theoretical. This thread from Audiokarma might help.
https://audiokarma.org/forums/index.php?threads/how-to-calculate-fuse-value-for-speaker-protection.569038/

If you're really concerned about overpowering a speaker with music as opposed to protection from a failure/accident then start really small with .25-.50 amp fast blow fuses. Also keep in mind most speakers damaged from turning up the volume too high are damaged because the amplifier didn't have enough power and started to clip. With lots of headroom in your amplifier you're unlikely to damage your speakers without recognizing you've turned it up too high.

[opnly bafld]

Is there a formula or an online calculator for selecting the appropriate speaker protection fuse amperage, when I connect various speakers to my AVA amplifier? My interest is selecting fuses based on the maximum power rating for a speaker, so to not overdrive a speaker.

Why worry about it?
Only drunk/high people and stupid relatives overdrive speakers long enough to damage them.

[Tone Depth]

Why worry about it?
Only drunk/high people and stupid relatives overdrive speakers long enough to damage them.

I include bored audiophiles and ignorant friends to the list.

[Tone Depth]

There are formulas for the theoretical. This thread from Audiokarma might help.
https://audiokarma.org/forums/index.php?threads/how-to-calculate-fuse-value-for-speaker-protection.569038/

If you're really concerned about overpowering a speaker with music as opposed to protection from a failure/accident then start really small with .25-.50 amp fast blow fuses. Also keep in mind most speakers damaged from turning up the volume too high are damaged because the amplifier didn't have enough power and started to clip. With lots of headroom in your amplifier you're unlikely to damage your speakers without recognizing you've turned it up too high.

I think peaks that cause over-excursions of a cone is equally important.

[Rusty Jefferson]

I think peaks that cause over-excursions of a cone is equally important.

In that case...

....If you're really concerned about overpowering a speaker with music as opposed to protection from a failure/accident then start really small with .25-.50 amp fast blow fuses....

If you're using a large solid state amplifier with speakers that can be damaged easily from too much power I don't think depending on a fuse to prevent damaging a driver, while playing music, is a good idea. Even a fast blow likely isn't fast enough.  Consider a speaker protection circuit instead. They can be dialed in very precisely to trip out before a driver is damaged. I don't use one but have friends who do. One is using an active system with kilo-watts of power and it makes him very comfortable knowing he won't ruin a driver(s) from carelessness or an accident.

[Tone Depth]

In that case...If you're using a large solid state amplifier with speakers that can be damaged easily from too much power I don't think depending on a fuse to prevent damaging a driver, while playing music, is a good idea. Even a fast blow likely isn't fast enough.  Consider a speaker protection circuit instead. They can be dialed in very precisely to trip out before a driver is damaged. I don't use one but have friends who do. One is using an active system with kilo-watts of power and it makes him very comfortable knowing he won't ruin a driver(s) from carelessness or an accident.

Thanks for your input, I'm just dealing with an AVA FET Valve 600R @ 300W/channel amplifier. I've seen fast blow fuse specs of triggering in milliseconds, should be fine for my use case where high audio levels aren't generally tolerated. 

[opnly bafld]

I include bored audiophiles and ignorant friends to the list.

Don't let any of them touch the system unsupervised, problem solved.

[Tone Depth]

Yep