I got a pair of 15L7's and I was wondering is it worth it to do the SPL/Deepbass box or do the street bass box they recommend. I don't really care about space in the car. I was just wondering if it makes an audible diffrence or not. If it does its bye bye backseat.//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif