Old Rockford Fosgate 800 x 2 amplifier and 12 inch mtx road thunder subwoofer. is sub or amp gone?

I was listening to a song and had my head unit volume on high. All of sudden, my subwoofer zapped on me. I checked the fuse and it was broken. The sub still got some power on it because I heard a small thump on it. I replaced the fuse and it still didnt work. when my car starts there is a hissing sound coming from the amplifier which i have no idea what it is. The dealer gave me a old mtx subwoofer from 2002 (road thunder model) 125 RMS while i believe my amp is a 2 channel 800 watt amplifier. Could the amplifier be too powerful for the subwoofer? I'm pretty mad right now not only because of this problem but because this guy sold me a 2002 mtx subwoofer that looks vintage! What should i do?

We need model numbers and connection info, but RF tends to under-rate their amps, so an 800W RMS x2 RF amp is likely 960Wx2 RMS in real power.  If you hooked it up to a 125W RMS sub, it is likely to have blown it no matter what you did if the head unit volume was on high.

Hope This Helps!!!