Keep Blowing Fuses On My Amplifier and Subwoofer?

I have a single 4 ohm Boston Acoustics g5 10" subwoofer hooked up to an Alpine PDX1.6. My subwoofer is 450 RMS My Amplifier throws out 600 RMS at 2 ohm and 4 ohm. Whether its 2 or 4 ohm, it puts out the same wattage, so dont question this. My amplifier has been tuned by a professional. My wiring is yes... show more I have a single 4 ohm Boston Acoustics g5 10" subwoofer hooked up to an Alpine PDX1.6.

My subwoofer is 450 RMS
My Amplifier throws out 600 RMS at 2 ohm and 4 ohm. Whether its 2 or 4 ohm, it puts out the same wattage, so dont question this. My amplifier has been tuned by a professional. My wiring is yes the right gauge infact. Everything is properly secured ground, etc. So when I Turn my Subwoofer up why do I keep blowing fuses? Sometimes its on my amplifer sometimes its on my subwoofer. Im getting pisssed off cuz these fuses cost like five bucks for two.
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