hey i was wondering if i can get some help in picking out an amp. im getting a infinity perfect 10.1d. im thinking of getting the Sony XM-DS1300P5 amp but i thought id get your opinoin on it first. i was reading how the frequency on the sub goes down to 18 hertz and the amp plays down to only 40. is there a noticeable difference in that. any suggestions would be greatly appreciated im looking to spend no more then 200 on the amp. other info: the amps going in a sealed box, i listen to mostly rock and metal if it helps. and one final question do you think the sub would sound better in the trunk or behind a front seat in a coupe? thanks!