Do Fuses make a difference ib sound?

Unequivocally no.  They don't make a difference.  Sleaze bags like Synergistic Research counts on you believing his word salad and thinking you hear something that is NOT there.

I use the slugs also and my mono blocks are protected with a digital (electronic) breaker. I noticed a good change. The breaker on one was tripped and protected the amp as it should and resets itself. Highly recommended. 

@mggartner +1

One audiophile friend swears by them.  Another couldn't be bothered.  I've tried them but can't hear enough of a difference to keep spending money on them.  Generally speaking, when I hear a tweak that really makes a difference, it stays in the system.  If not I save my money for something that offers a discernible improvement.

"Unequivocally no.  They don't make a difference.  Sleaze bags like Synergistic Research counts on you believing his word salad and thinking you hear something that is NOT there."

You never tried them, so your claims are fabricated. I've done blind testing on them and they make a difference. Also, I know how to do bling testing the correct way, not some senseless test where, "I tried a cheap one and an expensive one and no one can hear a difference.".

No doubt you are going to say I'm wrong. Fine. Show us where you are getting your information from. You will not be able to provide a single, credible reference to support your "facts".