The 8 ohm? Very good. So wire them all together in parallel and you will get a 2 ohm load on the amp. There are a lot of good amps out there that will give you 500 watts RMS at 2 ohms... A monoblock for 4 subs is just fine, you could use the JL 500/1 if you wanted, but shop around and see what kind of deals you can get.