I dont think it would make a difference
Aren't soundwaves from a sub non-directional.
yeah. it doesn't matter which way they face. the soundwaves are non-directional. i've been putting a sound system in my car for the past 6 or 7 months, and i've had lots of problems b/c i ordered all the shit online. warning: don't order from gopcplus.com. first amp they sent me was used. second one looked new, but it burned one of the voice coils on my sub, and i found out that it was remanufactured after i sent it into kicker. if you order online. try to make sure the site is an authroized dealer. i'll post pics of my set up in the trunk. it's clean. and from what i've seen on the forum, it's saved the most trunk space out of any other set up. (it's one 12, and that big ass kicker amp in the pic).