You're wrong. It won't sound bad. I bet you wouldn't even notice. They have special meters designed to detect phase so that you can correct phase issues. You may have to flip the phase your right front mid bass to even out imaging issues for mid bass, right now my right front woofer is out of phase and is obviously apparent. The test CDs confirm problems like this, and flipping phase will help the center the soundstage.
In my Blazer, flipping the phase on the sub to "backwards" made the sub cleaner, and more accurate. That's why high end head units let you flip polarity on each individual channel. Sometimes speakers, being placed at different distances from your ear, can be out of phase, even though they're all hooked up "the same".
I'd advise you learn what you're talking about before you comment. Changing phase on one speaker can be used to alter the imaging of a system, and often for the better. Many of the audio elite use this tool, in home audio especially.
http://www.diymobileaudio.com/forum...dumb/104232-wiring-one-speaker-out-phase.html
---------- Post added at 12:33 AM ---------- Previous post was at 12:29 AM ----------
Lol. You truly are completely oblivious to car audio. Make that statement on a car audio forum and they'd disagree tooth and nail.
I'm trying to share some more advanced car audio knowledge I have, just because it's over your head, doesn't mean I'm wrong.