I guess one way to look at this is quite simple. Replacing the 6.5A fuse with an 8A is perfectly fine..........until it isn’t, but then it’s too late. Beyond that I have to take exception to a comment made by @auxinput. In his post he made the following comment...
"Generally speaking, a higher amp fuse is a thicker wire with less resistance. It will allow more current and faster current through to the device and the result can be improved dynamics and punch/power in the sound."
While his point is theoretically valid consider this....
The speed of electric (electromagnetic) field propagation in copper wire is slower than in vacuum by a factor referred to as the velocity factor. The speed of electromagnetic waves propagate in vacuum is 299,792,458 meters per second. The velocity factor for a 12-gauge copper wire copper wire is about 0.951 (according to this source). Therefore, the speed of electricity in a 12-gauge copper wire is 299,792,458 meters per second x 0.951 or 285,102,627 meters per second. This is about 280,000,000 meters per second which is not very much different from the speed of electromagnetic waves (light) in vacuum.
My point, respectfully to @auxinput is that if you can hear a difference in the thickness of the material in an 8A fuse vs. a 6.5A fuse then dude, I want your ears! This just seems like a logical fallacy to me.
"Generally speaking, a higher amp fuse is a thicker wire with less resistance. It will allow more current and faster current through to the device and the result can be improved dynamics and punch/power in the sound."
While his point is theoretically valid consider this....
The speed of electric (electromagnetic) field propagation in copper wire is slower than in vacuum by a factor referred to as the velocity factor. The speed of electromagnetic waves propagate in vacuum is 299,792,458 meters per second. The velocity factor for a 12-gauge copper wire copper wire is about 0.951 (according to this source). Therefore, the speed of electricity in a 12-gauge copper wire is 299,792,458 meters per second x 0.951 or 285,102,627 meters per second. This is about 280,000,000 meters per second which is not very much different from the speed of electromagnetic waves (light) in vacuum.
My point, respectfully to @auxinput is that if you can hear a difference in the thickness of the material in an 8A fuse vs. a 6.5A fuse then dude, I want your ears! This just seems like a logical fallacy to me.