New "Hi-Fi Tuning Fuses"

[Feanor]

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That even this amount of difference could be had simply by replacing a line fuse is amazing.

Indeed ... amazing.

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But what was truly amazing was the sound after replacing the remaining four fuses. If I were to make an analogy, it would be the same as the before and after if you have your car tuned up, put on new tires, and have the wheels balanced and aligned: while the car may have performed well before, now everything works better. It starts more easily; it runs more smoothly; the transmission shifts more readily; the handling is better; and it rides more smoothly. In short, while good before, it's a whole lot better now.
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I have yet to get around to trying the fuse in my amps or preamp but do have them in my Magneplanars. I feel I hear a difference on account of the fuses which, however, is very slight at best. My analogy would like wiping a fine layer of dust from your TV screen.