i had two of these and they sounded great. I had them for about a month and a half and they sounded fantastic, I had them in a sealed box ran by a RF PRIME 500-R. and they hit HARD. but after a while, the rubber surrounding on the sub, started to come unglued and so then the subs would make a really irritating rattling sound. So their durability is a little poor but other then that they are a great sounding subwoofer.