fuse between sub and amp?

I have 2 15"s CVX, 1000RMS 2000Peak, 2000RMS both 4000 peak, DVC 2 Ohm
I'm going to buy an SPL GRLA5500/1D
1700 Watts @ 4 Ohm RMS
2500 Watts @ 2 Ohm RMS
3200 Watts @ 1 Ohm
5500 Watts Max Power

I'm going to run the subs at 2 Ohm, But i'm not sure the the peak of the amp at 2 Ohm will exceed 4000 watts. I'd like to have t fuse in between the subs and amp just in case (less expensive to buy a new fuse than new subs). Only problem is I don't know what size fuse to use? What fuse blows at 4000 watts?

I = √(P/R), ie Amps = the square-root of {Power (Watts RMS!) divided by Impedance (Ohms)}.

I'll leave the suitability of fusing for this application to other experts.
If there is any point to it, fuse ratings and response time become factors.

But ignore PEAK Wattage - that is a useless measure in practice (equipment design excluded) - it is the RMS Wattage that matters - ie, 4000W peak does not exceed 2000W RMS.
RMS is essentially the long-term "average" power capability (under stated conditions).

FYI - peak Wattage is always 2x RMS Wattage - that's a mathematical relationship. The exception is where people make up their own "peak" relationship - as I do when I say my 68HP engine outputs a peak in excess of 2,780HP (for 1uSec at the gudgeon at 3mSec after ignition & extrapolated to all cylinders with a southerly breeze...).
The point being, peaks are useless and have often become "imaginary" - a mere way of appealing to the ignorant, and often matching volume knobs or displays that go up to 590 instead of 10 or 40 etc.
However, I stand to be enlightened...

The fuse before the amps isn't to protect the amps its to protect your car from becoming a fireball if the power wire was to come loose from your amp. The fuse 12" to 18" from the battery should equal the total amps of the fuses that are on the amps themselves. Just add them up and your set.

I'm hoping the fuse between subs and amps was a typo... you did mean battery and amps?

tee hee... I assumed not...

Glad to see someone else with my POV - an amp-speaker fuse is not the way to protect...