Where has been your most effective placement for an aftermarket fuse?


Not looking for a debate with anybody on whether aftermarket fuses work or not, this thread is for those fortunate members with the hearing to know that they do indeed work.
I am very interested in your thoughts and opinions as to where they work the best, the biggest bang for your buck if you like.
For myself I am going to say it is in my Metrum Onyx DAC.
And not just my present DAC, all of my last 3 DAC,s showed a very nice easily audible improvement with an aftermarket fuse.
Next I would say is in my Gold Note phono stage and lastly in my BAT integrated amp.

So what or where would you say has been the most noticeable piece of equipment that has benefited from a fuse change in your system?
128x128uberwaltz
To my ears, the biggest improvement I’ve heard on my source components...streamer and CD players. The preamp and amp fuse swap resulted in very subtle improvement.

I have tested Furutech, SR Black, Hi-Fi Supreme Supreme Au/Ag and Cu. I end up preferring the HiFi Tuning Supreme Cu‘s in digital components as they slightly pushed the sound towards organic and warmer presentation.
I have never heard of using a fuse?  Aren't there fuses built in to each component?  How could a fuse cause any audible difference.  Maybe it is like the Emperors New Cloths?
I have never heard of using a fuse? Aren't there fuses built in to each component? How could a fuse cause any audible difference. Maybe it is like the Emperors New Cloths?
Sorry Larry but I have to ask, where have you been over the last few years?
Aftermarket fuses have been one of the most contentious topics in these forums with some quite spectacular histrionics on display. 
@clearthinkder-      "The best cost $500 a pop,....."        Interesting!     What fuse is priced at $500.00, specifically?       Certainly: nothing that’s been mentioned here.      Have I overlooked one?
Rodman.
I had pondered that statement and even googled it but most expensive I came up with was Audio Magic Ultimate Beeswax SHD  at $225.