Here is my current setup, Vehicle 05 TrailBlazer Speakers (2) Eric Stevens Full body horns Under the dash (2) Silverflute 6.5's Factory location Processing MiniDSP Amplifier USAcoustics Barbra Ann 100x4 at 4 ohms or 175x4 at 2 ohms. Currently I am very satisfied with the current sound and output however, soon I will be going from no subwoofers to four fifteens. I am worried I will not have enough output on the mid side since I am running a single mid in each door in the factory locations. At my disposal I have an extra pair of silver flutes sitting in my closet just as spares which could be added. My question for outputs sake would I be better off going with two pairs of silver flutes per door, or a single large 10"+ mid? Fabrication wise; I'll be fiberglassing obviously, so mounting location is really up to my imagination losing some legroom wouldn't be out of the question, but I'd like to keep as much as possible. My overall goals are output, clarity, and able to keep a high level of output for long periods od time without fatiguing. Any questions please feel free to ask.