I would like to know what the sq and spl differences would be between (1) 15" x.x.x. powered with a phoenix gold Xenon amp (1200 watts @1-4 ohms) in a sealed box compared to (2) 12" x.x.x. powered with a MTX Thunder 1500 (750 watts per sub)?This question is kind of off the subject, but if i get a set of diamond audio hexs500 for the front with no rear fill would i be better off with the id max or the triple x? If i got 2 id max 12" would 600 watts a peice be enough power to get the most out of them? if not please give a recommendation if possible.Also does anyone know of any other regulated power amps other than jl and phoenix gold? Sorry for the long post.