I prefer to use the OEM head and amp, but dang, I had to unplug the other speakers in order to hear if the tweeters were working... They are, but don't think they could be heard.

Ok, the OEM tweeters are just over 3 ohm, but I don't know the sensitivity spec of them. Had as anyone found a better replacement tweeter only? Or have you replace the door speaker with another "componet" set with better sound?