High resolution digital is dead. The best DAC's killed it.

"But how do you know whether your system is in correct Absolute Polarity? "

I've have also been reading material concerning absolute versus inverted polarity.  According to the author, polarity is most easily determined by utilizing either a "Polarometer"  or "Polar e Detect" developed by ronco and sold exclusively on TV and at better department stores.

Alternatively,  one may look at your system through a mirror, if the image is reversed, your system is in correct absolute polarity, ahhh, or maybe its the opposite way around, have to look that up again?   Naturally, if you are one of our friends located south of the equator, the opposite of the north positive for inverted polarity will indicate southern correct absolute polarity.

I am not certain this is the same thing, but the Meitner PA6i preamp I had years ago had an absolute phase inversion button on the remote. I could not tell any difference whether the button was selected or not.
http://www.museatex.com/pa6i.htm

Erik "Most multi-way speakers have 1 or more inverted drivers. A typical 2-way box speaker inverts the tweeter relative to the woofer (but not always)."

Sorry, I am being dense here.  Are you saying that the tweeter and woofer are set up to not work in tandem.  That is, when a signal is telling the woofer to play a note (extend out), the same signal would have the tweeter do the opposite? Or maybe to say it in another way, the woofer and tweeter + and - are attached opposite to the signal from each other?

Thanks for the clarification.  The only reason I mentioned it is that it would have meant that when replacing drivers I had them not correct.

I have used the battery testing method, but not with a tweeter.  Can you see anything move in or out on a soft dome tweeter to test polarity?