I have a Dd M3a already and I am thinking bout doing 2 12" or 2 15" American bass xfl for a daily/comp setup for my 2000 gmc sonoma was wondering what tuning would be best for my vehicle and which subs to get and how many cubes. I dont want to sound like and idiot I am pretty new to the box tunings and how many cubes will work best

 

If you want somethinh for daily and comp i suggest a box with interchangeable ports ...2cft per 12 and 3.5cft per 15 is a rough estimate ...tuned to 28-35 for daily and 40-50 for comps depending on the peak freq of ur car

 

This information is very constructive for correct planning. I like your work for providing information to the other.
I’ve been researching this topic for a few hours and found this post pretty helpful. Thanks for compiling the info in one spot.