Hi a401classic,
These fuses are not required for the amp to work properly or to avoid damaging the amp. In fact I don’t think they are even required for either CSA or UL but CAS wanted them in there because we also have a CE rating on the amplifier. Originally they were internal because they are very difficult to blow; you would need a drop below 90 volts followed by a spike to blow them. Since this actually happened in a few instances we moved them to the panel for easy replacement. Two of my EP600s are the original prototype amps and they do not even have these fuses inside or out and I have never damaged my amps; and living in rural Canada big voltage swings are a fact of life. We can certainly send you some fuses for them if you like on Monday. Recently we started including spare fuses with every EP400/500/600 sub just in case. We did not realize they were a bit tough to find until we out-boarded them on the panel. I hope this helps you out a bit with your current blown fuse issue.
