I have a JDM Subaru Legacy GT Twin Turbo Wagon (right-hand side driver) and have had my subs on driver's side, passenger side, and in the middle. I think it sounds the best on the passenger's side (left-hand side) in my vehicle. My wife has her sub on the driver's side (JDM right-hand side). I think it varies with every vehicle. Try it in all positions and see what sounds best. ...hope I didn't confuse you.