Could be a number of different things. If you replace the fuse, how long does it play before it blows, will it still blow if the bike is sitting parked, how loud are you playing the radio when the fuse blows? A lot of variables. I used to have the PBRs, didn't have much luck with the 300x4, and still wasn't happy with the 300x2, though IMO it was the better of the two. I never had a problem with fuses. What size fuse are you running to the amp?
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......