Car Audio Amp Vs Amp?

I would say keep your kenwood. It can push 900 watts x 1 @ 2ohm. If the sub cone has a hole in it I wouldnt take it. I would go get myself sum better condition ones if your really looking for new subs. that kenwood can power some good quality subs with 900 watts at 2 ohms. Just be sure to get a pair of subs that can be wired at 2 ohms