I replaced the speakers and head unit in my Accord LX. I also added a pretty powerful amp to the system. The problem is when I turn the volume up to a certain level, the "Back-Up Radio" fuse under my hood blows. Is there any way that I can make it so the fuse can handle more before blowing out?

Try turning the Treb, and the Bass down, if this doesn't work, you will need to keep trying bigger and better fuses until you find the right kind.. good luck to you!

P.S: I am not sure that this is EXACTLY the problem, but this is what happened to me, and that is what I had to do.

Well, I have the settings how I want for the sound, so I don't really want to change that. In terms of fuses, the fuse under the hood that blows out is a 7.5. Wouldn't putting a larger one in cause more problems?

Larger fuses hold more voltage...

It said in the manual under fuses that putting a fuse in of a wrong voltage could cause problems or something

It's totally up to you, I mean I come from total redneck ville so we like to think that manuals are for losers for some reason though, but I'm not going to be the one to go against your manual.. It just worked for me man..