Fuse upgrades? -- 6.3 amp 250v 5X20mm fast blow fuses

Geoff,
Thanks for chiming in.  I will admit that Steve McCormack is a devotee of SR fuses and he knows audio gear. 

@whitestix SR hasn’t sold 30,000 fuses for no reason.

30k fuses, eh?

You’re makin’ me think I should go back and finally finish the fuse tech I was working on (tinkering with, off and on) for nearly a decade, and finally bring it to market.

Before we have a zealot coming in and reducing this thread to a troll fight, I will say that fuses are a way to tune your sound.  There's no right answer and I have actually used different fuses in different situations to "adjust" the sound.
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Such as, Furutech are probably the most neutral high resolution fuse.  However, too many Furutech in one device can make things too warm/slow.  If you have 4 fuses in the DNA, you probably have a single "Main A/C" fuse.  I would do the 4 fuses all Furutech and then keep the stock fuse for the Main A/C or look at faster alternatives.
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Hi-Fi Tuning Supreme is a silver/gold mixture and it is a much faster sound with faster attack and more detail.  However, it can easily push a system over the line into the "too fast/bright/harsh" area. 

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Isoclean or Hi-Fi Tuning Supreme "Cu" (copper).  These are gold-plated copper and can be used to make a system warmer sounding.
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There are others you can play with, but I haven't tested any of the other new offerings.

Another note.  I haven't tested the Synergistic BLACK/BLUE fuses. The older SR20 fuse is very clean and fast, but it lacks the high frequency response (so it sounds a little like a Class D amp would).
The Synergistic "RED" fuses is about the least offensive fuse.  It will sound okay in any system, but it is slow and not very detailed.  The Isoclean actually gave more detail and resolution, even though it was still a warm sound.