I recently purchased Audiobahn AW1251T subwoofers in a dual bandpass box. Now all I am looking for an amp. The sub specs: 400 RMS - 800 RMS MAX The box is pre-wired for 2 ohms so I am wanting go with that. I was told you can cut the wattage in half when using a bandpass box rather than a sealed box. I was looking at this new Punch amp that was at a local audio shop... I can seem to find it on the Rockford Fosgate site, but I believe it was a 900w ... would this be sufficient for these subs?