Comp Subwoofers Are Kicker Comp Subwoofers Decent Or Terrible?

Are kicker comp subwoofers decent or terrible? - comp subwoofers

I've looked on eBay kicker comp subs and ask how they say to compare Rockford Fosgate 12 "s to explode, or Sony. They seem to have power behind them, but they are only 300 watts maximum'm sure I've noticed that it is very cheap on eBay. Why is that what is good or bad? In view of 10 ", 12" and 15 "

For now, I have taken a 15 "eclipse of operating a power amplifier 6300 watt sound, 10 farad cap, and I wonder if I have a couple 12" s, it is would sound good, did. let me know