Since we don't have an audio section...

I don't use an amp with my 10's, just the Stereo and it does fine for me.
Don't use a lot of volume, just hi bass and mid treble with the midrange down so it sounds good without being obnoxious for people to talk.
(which I hate doing if music is playing anyway, but it happens if anyone is with me) :-)

How does this not ruin your head unit? I tried doing this when I was 16 when my amp died. I had a pioneer head unit 50wx4 I believe. I hooked the two subs in place of the rear 6x9 speakers, and it worked well for awhile, but then the head unit died.

Someone said the subs were trying to draw more power thus killing the head unit. Maybe it was unrelated?