Bradon if you wanted to you could run 6 speakers off 1 amp especially the 4250. I ran 8, 4 ohm speakers off my 4180 in parallel! The only tricky part you would have with 6 speakers is that, you would run 1 pair off channel 1-2 and 2 pairs off channel 3-4. The 2 speakers in parallel would have to be 4 ohm and very close in efficiency (sensitivity)! But it would be easy to do. The set up your considering 6.5 in fairing, 8' in lower, and 6x9's in lids would be difficult to run in parallel! A small amp added would be the best way to go in your case. If you do get a high end amp like the Focal or BT I would also put a better speaker in the fairing like a DD AW or BT Pro 7.1 or Hertz, or Focal K2 component set! I would try to listen to a PA speaker before you decide to put it in your fairing, They are loud but not as musical or accurate...depends on your ear!