im just wondering since the recommended fuse size for 4ga wire is 125a would it be possible to use a 150a or even a 100a being that i just cant find exactly a 125a anl fuse??
actually 4ga cable is good for up to 125A peak. you should match the fuse to the current draw of your amplifiers. I'd stay under 125, so 100A at most is good. remember even a 100A fuse takes a max of 4 minutes to burn through at 200% load, so you're still very much in a safe zone there.