To complicate matters, the drivers in many loudspeakers are wired in various states of inverted polarity relative to one another. Vandersteen famously are not, all drivers in them being wired in the same polarity and crossed-over with 1st order filters, which maintains the speakers phase (at x/o frequencies at least). Many planars are of single-polarity design, of course. When you have speakers whose drivers are in opposite polarity to each other, good luck trying to correct for source material! I guess getting the midrange driver to move positively to a positive signal is the thing to prioritize.
Technical question on phase inversion.
This past weekend, I replaced my solid state preamplifier with a tube preamp. What a difference! I really like the change in the sound but I'm confused by one thing. The MFA Magus B manual says this about the main outputs, "NOTICE: The high-level stage of the Magus preamplifier is an inverting amplifier. Many audiophiles prefer to correct for this by reversing the speaker cables on BOTH speakers (+ to - and - to +)." So, now I'm confused! I have tried it both ways and they both sound good to me. I'm wondering if there is a rule of thumb about "inversion" that I'm not aware of. So far, I'm only listening to CD, if that helps. Don't get me started on how to correct for inversion when playing analog. That's my next adventure!