Actually my best fuse swap was actually to remove the cheap fuses that came with my Magnepan 1.7i speakers and replaced them with the silver tubes (not fuses) that came with my Powell Ag Magnepan upgrade. Besides the silver tube in place of the fuse there was also a silver jumper to replace the steel plate stock jumper. Using the above upgrades improved bass tightness and top end treble/cymbals. Of course, the ultimate bass upgrade for the Maggies came recently when I added a stereo pair of REL T/9i subwoofers! Wow!