ok, so i decided to go with the jbl bp600.1 since everyone was talkin that up so much. i was just wondering if anyone that has this setup, two alpine swr-1221d and this amp, or somewhere near it, could tell me all the settings i should adjust my amp to? like subsonic level? and the low pass range. now i think i know high pass/low pass, thats like the frequencies that are sent to the sub right? so id only want like 80hz or below? would i want more like 100 or lower than 80 or wat? any settings would be helpful, thanx