[Johnb911]

There is a difference between Acoustrical and Electrical Phase.

If you hook up the speakers terminals pos to pos etc.
They are in electrical phase alienment with each other.

If you switch one speaker around neg to pos etc.
Then they are 180 degrees out of phase with each other.

IE.
If you have them in phas with each other electrically you will be able to see the driver move out together and back in together. Assumming the are playing the same signal.

Acoustical Phase deals with arrival time of the wave form at your ear.
Depending on the distance diference between the two speakers and the ear they will be slightly out of acoustical phase with each other.
This can lower or raise the soundstage, blur the image etc.

As an example.
Sometimes you pull the whole front end of the car out of electrical phase with the subs in the rear to help simulate the bass coming from the front.

None of this takes into the phase shift issues with passive crossover networks though.

Hope this helps.

The last thing we need to do in confuse people.