So I was gifted a sub off a mate which runs at 250W @ 4 ohms and just bought an amp, the amp is a Juice Ja1201d 1200W peak (I don't believe this rating lol), rms 480W @ 1 ohm, 380W @ 2 ohm and 225W @ 4 ohm. It has a 50A fuse on it.
I was trying to do some math to figure out what fuse I needed...