Auxinput, also a relatively inexpensive to try with a fuse change. I never heard of a fuse change making a sonic change. Can you help me understand t
stock fuses are usually made with low grade metals (such as nickel or tin). Also, we have electrical and mechanical resonance that makes its way into the fuse. The fuse is a small wire that is stretched across two points. A/C power is applied to the fuse at 60 hz (60 waveforms per second) and will also have it's own noise and resonance. Think of it as a guitar string vibrating in air. Additionally, the glass case also can resonate mechanically from vribrations.
All this electrical resonance prevents the wire from charging smoothly. The result is generally a bright and harsh sound, but can also be lack of bass.
Upgraded fuses use much better metal components (copper or copper alloy). They also have anti-vibration material inside the fuse casing, such as powder or a liquid. Some use cermic casing instead of glass, which also reduces resonance.