One reason why aftermarket fuses usually sound better than stock fuses is simply because they are inserted in the proper direction, especially if the stock fuse was inserted backwards. Now, knowing that wire in the fuse is directional should be a tip-off that all wire is directional, no? Can you imagine what the sound could be like if all speakers and electronics and transformers and capacitors, etc. were fabricated with this directionality in mind? Hel-loo!