A fuse is only there for speaker protection. And if you practice careful playback habits, they are not needed. Plus, adding a fuse is not going to offer any sonic improvements to your playback system. Adding a fuse, could in fact degrade the sound of your system. You're adding a devise that would basically limit the input signal, as it's gauge isn't any where near the size of a standard piece of speaker wire. So, if you're careful with how you use your system, why consider it?