Break-in procedure

Your pre-amp inverts polarity, not phase. You don't need to consider that, just connect one of the speakers out of phase. Presumably you are putting the speakers face-to-face and running them out of phase in order to cancel out as much of the sound as possible. If so, use a mono source. And be careful not to turn the volume up too high.

Not sure what you mean by directionality.

I would NOT wire one speaker with reverse polarity from the other and then face them at each other to help break them in. This works the one speaker's suspension in the normal manner that it would be used while the other speaker is working exactly the opposite of normal.

Having said that, i would face them together and then play a mono signal into them OR use the out of phase track on the Ayre Acoustics Irrational but Efficacious "break in" cd. Do NOT try to use this track with your preamp in mono mode as it will simply null itself out and you'll have absolutely nothing coming out of your speakers.

As a side note, i used this entire disc to help break-in my father's speakers that we just got done rebuilding. This disc was put on repeat and played for almost two weeks straight. Given that he wasn't home during that period of time made it a lot easier to do this : ) Sean
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PS... Be careful with the Ayre disc as it starts out at 5 Hz on two different tracks. Vented speakers will be throwing like mad if you have the volume turned up at all, resulting in possible damage.

What difference would it make to work one speaker in the "normal" manner and one reversed during a break in? Range of motion is the same, and the speakers will see reversed polarity source material all the time anyway. If it's really a concern, reverse polarity between channels half way through the break in process.