5560, I found upgrading fuses on my 3.7's from stock to Audio Magic LA fuses was well worth it. I can't tell you what amperage the 1.7 uses. I would wait until you get the speakers at which point you will be able to tell what amperage to replace them with. They will be fast blo fuses. I also found getting rid of those nasty stock jumpers to be very worthwile. Both of these tweeks resulted in an immediately noticable reduction in grain.
Magnepan MG1.7 fuse question
I have placed an order for a pair of 1.7s. I want to upgrade the fuses but I don't know what spec is shown on the back place for the fuse. One person thought the spec was for a 4amp but I thought that seemed high. Could someone please let me know what the amp size it is. I assume it's a fast blow. Any help would be appreciated.