I've read that speaker placement can effect SQ and volume bla.. bla... bla! So with that in mind, is there a science to finding the optimum location for subs, or is it just trial and error? I have 2 PA FUBR-10's I made my own sub tube, ported and tuned to 39hz (mfg recommended) but i only have room in the truck for 1. I have a sealed inclosuer.....incloseu...BOX also mfg recommended that is smaller. .5 cu.ft. If I put 1 sub in the sealed box and 1 in the tube would i get bass cancellation becouse of the different freq. I,m getting Orian hcca-d2400 today to push the subs.