[BruceH]

As others have said, your door speakers are bass only. Upgrade your door speakers at the same time you upgrade your HU. Take a look at these two threads:

http://986forum.com/forums/general-discussions/30925-door-speaker-upgrade.html

http://986forum.com/forums/general-discussions/49796-found-6-5-speakers-fit-door-without-mods.html