What causes phase shifts...Sean?

I just ordered a reference grade book on electronics that is supposed to be both excellent and very easy to understand. If it turns out that it is as good as all of the hype says it is, i'll post something listing the name and good places to pick it up. Only problem is that this book is not cheap, but would be well worth the investment if it can help those that are interested in really learning more about this subject. Other than that, Aball did a nice job on that one : ) Sean
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Other than electrical elements which inherently cause phase shift (and enables passive x'overs to work), there are: room reflections and delays to waveforms introduced by A/D and D/A converters, microphone placement, wiring losses, RF/EMI, processors, mixers; anything that comes in contact with a signal has the potential of screwing with the timing relationship.

A good reference with more info than you'll know what to do with:
"Acoustical Engineering" -Harry F. Olson, 1991.

From what I have read, the most common cause is in the crossovers of 98%+ of speakers ... one driver ... as I understand it the mid-range or tweeter ... is wired reverse phase to the other drivers with anything other than a first order (-6dB per octave) crossover.

Thanks for popping up the question again Wellfed! You helped me to learn, which is always good. Cheers