Well if they say 440 max then they can probably take 220 rms which is about inline with your how its wired assuming the crunch amp puts out what it is rated which is a big if. Right now you are wired 4 ohm stereo. You really dont have any other options with that amp. Your only other options are 8 ohm bridged (mono) which is pretty much the same power or 2 ohm bridged (mono) which your amp cant handle.