I read here on AG that a cold start with a regular fuse can take up to an hour to recover from the a hard cold start. That is the main reason boutiques sound better and over time stay sounding better. That little wire isn't moving in a fuse filled with a dampening and heat sink material, it never gets hot like a standard fuse on startup..
Cold start a 3.5amp stock fuse 30 times and look at the wire inside. It use to amaze me when I'd change the fuses in my old speakers. Tightening driver screws and changing fuses was like getting new speakers. Amps; any fuse with a dampened wire, barrel and goo will work for me. -------> please not <-------- way. It matters. I don't know about SR but most the fuses I use sound different one way vs the other. ACME with a crinkle coat is a good fuse.