Hi! Is between the Q and BL such a great differece? I watched many videos and i like them both *g* 2 x 12 " would fit much better but i want 15 " ( sry if that sounds littl bit silly ) and i wrote in my first post that with the Q -Serie i coul make some experiments ( 2 closed , 1 in a big reflex and 2 in a smaller reflex ^^ )