[randywebb]

We also need to distinguish relative and absolute phase...

There is also phase shift as the speaker (enclosure) itself moves back & forth from the movement of the cone moving the box - first shown using laser interferometry by B&W IIRC...

"This is done by using the thiel small parameters of the driver."
- ?? Most commonly today, as ported designs are used. Sealed boxes/acoustic suspension are a bit different.

Can we come up with a real simple set of steps to avoid the confusion you refer to?

I definitely agree that there is no really good solution in a 911. But you can get pretty decent sound with door speakers as long your expectations are not extreme...


{Since phase was mentioned, todays biological-acoustics tidbit will point out that owls have asymmetrical ears - they are spaced differently on the head and differ somewhat in size and placement of the tufts to maximize phase shifts between the 2 ears. The brain can use this to better calculate distance information for more accurate prey capture.}