So I'm kinda in a bind right now I can't decide want to do I currently have 2 sa10s in a pre fab box I recently sold my amp and I'm getting the sae-1500d and adding a battery should I sell the 2 sas and get one X15 or keep them and get a new box, which would sound louder the 2 Sas in the right box or 1 X15 in the right box?