Bandpass is not recommended for the HCCA line of subs. Either a ported or sealed box. You are going to need a 3000 watt rms amp at least, but these subs can take much more than their rated rms wattage. I have 1 HCCA 12.2 running on 3200 watts rms and it is fine. I have it in a 1.5 cf ported box and it is very loud.
