Whats wrong with my car amp?

I was disconecting the remote wire from my amp when it quickley pulled out and touched the positive terminal while the wires were still connected to the battery. It created a spark and blew the fuse that was in between the battery and the positive wire, but did'nt blow the fuse to the amp. Ever since, my amp has'nt worked at all. Why wont my amp work even though there were two fuses, and if my amp is blown out, why didnt the fuse to my amp blow out?what can I do to fix it myself? Thank you.Amp type is 2/1 ch, MRP-T220, 70W per ch