Sure you could run through a head unit. That's the easy way to go. Just stash it somewhere. (As long as the head unit allows hand control of the iPad/iPod).
3-way passive up front, + sub. Kenwood Single DIN, Helix Competition A4S, Dynaudio Esotar 1200 infinite baffle in ski pass, MW 152 door, MD 102 sail panel, Jehnert Designs mids, Ixos, Straight Wire