Speaker in doors considered ported or sealed? I'd say they're ported because there are so many leaks in the door panel edges. So how should you set up the door system? Try to absorb all the sound inside the door as you can or let some of the sound out?
Even though loudspeakers utilizing bass reflex techniques (i.e., ported or passive radiator designs) are quite common, or maybe even the norm if you carouse the average audio/video retailer. There are, however, many misconceptions about how a bass-reflex system works. Most of these are either incomplete or flat out wrong. Here is a list of typical bits of misinformation:
Porting a speaker increases efficiency by allowing the back-wave generated by the driver to reinforce the front-wave.
Ported speakers have higher distortion than sealed enclosure speakers.
Ported speakers are more dynamic than sealed enclosure speakers.
The output of the port and woofer are out of phase with one another.
Ported speakers aren’t accurate as sealed enclosure speakers because ports (and passive radiators) are resonant devices