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- Plano, Texas, USA
I have different definition of "woofer". Woofer or sub-woofer is designed for low frequencies. A full-range speaker is designed to cover full 20Hz~20,000Hz for our ears. A dual-cone speaker is a cheaply made full-range speaker using a small whizzer cone attached to the center of the woofer helping to reproduce the high frequencies. But the 2-way coaxial speaker comes with an independent tweeter with crossover which will have much better sound quality for full-range frequencies than dual-cone speaker.... OEM speaker in the door is a woofer, even if full range. It's just not a sub-woofer.
Agree that dropping in a coaxial and leaving the tweeter alone will be an easier mod, but dropping in a proper component set will no doubt sound better even on head unit power.
Since our OEM non-Bose audio system uses dual-cone 6" full-range speakers on doors, the output from Tuner and Amp Unit is a full-range frequencies. If you use component speaker setup, I believe you'd lose high notes from your door speakers with new woofers which has no attached tweeter to produce high notes.