I will be purchasing MB Quarts reference series component speakers from a buddy. It includes 2 highs. 2 mids and 2 lows speakers w/ the cross overs. My question is, will I be okay running the highs and mids in my front doors, and the lows in my back doors. I do plan on adding a moderate sub in my trunk, so will I be putting too much low in my car? Or would it be better to get a pair of mids for the rear doors?