Power Conditioner

Because the fuse is almost as much improvement as the conditioner.

What about the utility to have both conditioner? 
Also, the swap of the fuses will void the warranty on the equipment? 

Be warned, power conditioners tend to rob some of the dynamics & limit current in amps.
The ones that don't, usually have massively large transformers & cost much more than the Furman.

Unless it has a lot of capacitance, which these do. Simply putting a great big cap on your AC will improve dynamics and bass like you won't believe. The problem is it needs to be carefully designed, or else filling all that will draw so much current it blows breakers - which already happened to kijanki see his comments above. 

How big of a capacitor across the AC line Millercarbon?  Since you say careful design can you tell us what that value is?