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"You need to seal the drivers inside the panel so that the front and the rear wave ofthe drivers (180 defrees out of phase from each other) don't meet and cancel each other out."
Phasing speakers is ensuring the polarity of the wires to the speaker is correct.
Sealing the rear of the speaker assy. (e.g. in an enclosure), is mandatory for the best audio reproduction. However, speaker enclosures with the correct interior volume is a luxury; it isn't practical in our cars - most cars, and if done via DIY methods, there's usually not enough thought about the ideal size. Protecting the rear of an exposed door-mounted speaker is a good idea.
I'd go with the speakers in the door panel rather than the space-encroaching add-on enclosure next to your foot unless it also performs double-duty as a foot rest. The audio guys usually recommend the high frequency driver (tweeters) be close to the mid-range driver. For that reason, I installed mine in a compromised position in the kick panel next to the authentic foot rest and closer to the mid-range speaker. It's some distance from a more ideal sound path to driver and passenger ears.
There is no convenient and ideal location for speakers inside an early 911. In the future, I see the ideal sound system to be personal headphones or even complete sound systems that allow important sound frequencies to be more audible (more than noise cancellation), but user-selectable to filter fatiguing exhaust resonances.
Sherwood
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