Unless the 1A replacement fuse blew I don't think an under-rated fuse should stop the sub from turning on. The new fuse might blow in normal use but that's not your problem right now.
We haven't seen a lot of Axiom subwoofer problems here other than those related to shipping damage or teething problems with the first EP500/600 units a couple of years ago so there may not be a big body of experience re: what components to look at. I assume you checked to make sure that the new fuse didn't fry, and that it's not a slow-blo vs. an original fast-blo ?
Axiom's customer service is really good so first step might be to give them a call.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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