help i think i screwed up my si 18
last night i was listening to music at a reasonable level and on of my subs started making a rattling sound so i took it out of the box and shook it and it sounds like something came loose inside the voice coil. anyone know what this could be? is this something i can fix? the sub is only a week old and ive got 30 people coming over for football on sunday and would love to show them both off.