I have two Infinity Perfect 12s in a dual bandpass box with the specs that Infinity recomends. They are powered by a 2000 watt amp. They are in a 1990 grand prix ste. I have a pioneer ph9300 deck with non fading sub preamps. They are 4V. 300 watt amp powering my Pioneer 6 x 9s. I have Pioneer 6 1/2s in my door. 5 1/4s in the dash, and a tweeter in each door. Thanks in advance guy!