I just installed my Alpine 149BT along with a HW RS400. I installed a set of HW ZX speakers in the factory location. I think it sounds awesome but I would like to add more speakers. My question is if I put a set of 6x9's in my lids or if I choose to add another set of speakers to my inner fairing will I be able to drive the set of speakers I have now and one additional set with the RS400? In your opinion which would benefit more, 6x9's in my lids or another set of speakers in the inner fairing? Thank you.