Perhaps they put a freq filter on the door speaker to take away the high freqs, and a filter on the tweeter lead to only allow high freqs to it. All done with caps of various sizes if I recall correctly.

This way the door speaker acts more like a woofer and being close to your body provides the good vibes of a louder sound.

BTW did they do this probono or did you have to cherio up with the greens! as they had shortchanged you and perhaps many others.

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