Hello Gianni,
I'm beginning to believe that although these fuses prove advantageous in all locations, Further up front in the signal path is where to start. DAC/CD player and preamp are very impactful locations. I began with one Red fuse in my tubed Line Stage and was utterly impressed with what I heard. It was more significant than I had anticipated. I'll receive my Black fuses in 1 or 2 days. They'll go DAC, Line Stage and then my two mono blocks. Fortunately(cost wise) each component requires only one 3 amp fuse.
Charles,