1 sub vs. 2 subs

i'm pretty sure that you're right wiseguy when you say you only get 3 more db but to get 3 db is like addin atleast half as much power ontop of what you're already puttin in.  so yeah it's not a lot (of sound increasement) but when you look at it it takes a ton more power to add those 3 db.

i'll second heavilymedicate's notion of one quality sub over two lesser ones.  You could hook up ten rockford-fosgate punch z's and put that up against one quality speaker (heavilymed uses JL for the ie.) and I put my car on it that the JL will sound better as far as sql, and probably come close to even with spl. 

Like I said though, you can get those 2 10w6v2's or get a 12w7.  Both run around the same price and both have probably the closest to "best sound" for the price you'll pay.  Oh and the 10w6v2's can be put in one SMALL box.  So box size can be taken into comparison.   Also look at Infinity's Kappa Perfect VQ those can run in like .4 cu ft sealed boxes.

thanks a lot for everyone's help

ill deffinately look into one quality sub, good amp, and great box

and i deffinately that its worth it to sacrafice a little spl for sql

anyone know any good internet sites for really cheap or discounted audio stuff?