as per halon451 making fun of my sub i went out and purchased a new jbl 10 inch powered sub now a few questions what ido i set it at 0 degrees or 180 degrees. it will be in the front of the room also do i set the crossover on both my amp and the back of the sub..and if so what is a good starting point to have it set at. i heard 80 is recommended. all my speakers are set to small thanks for your help guys