Lower door tweeters aren't bad, just have to be careful because coaxial speakers tend to have a passive inline crossovers, where as component speakers tend to have external crossovers handled either at the head, the amp, or at a separate unit. The issue you run into is if you just splice off of the main line you can be sending full range through woofers and tweeters. Tweeters hate bass, woofers don't really care about higher treble but it can muddy your sounds quite a bit.
The way to tell is the speaker will have a woofer with a tweeter that sits in the middle of the speaker on what looks like a stick.
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