How to wire these subs

If you want to do it that way, then you'd wire each of the subs in parallel like this so they each offer a 2 ohm load and the amp will provide 400W RMS per channel.  Alternatively, that amp can be wired to provide 800W RMS at 4 ohm by bridging the channels, so you could wire each of the subs in series and then together in parallel to present a 4 ohm load to the amp and they'd split the 800W, but it's pretty much apples and oranges.

Now as far as the subs getting enough power, that's questionable since they can handle 500W RMS and I'd have doubts about the Audiobahn amp giving you all 800W to begin with, though it may.  Regardless, I'd personally probably try and find something that's going to give you a bit more power if you can (closer to 100W anyway), but that amp will work you just won't be getting the full potential out of your subs.