Why do you think the effects are very audible in my setup? Its not the greatest but I like to think the speakers are more than decent (Dynaudio, which are also used in Studios). One thing I can think about is my living room is very small (condo) and the room gain greatly amplifies the effect. I feel that the most noticeable change is using dynamic and bass-heavy songs where dynamics are required for the woofer to work on. I recorded it here:
My video clip
Short answer, I don't know, but without a true blindfold test are you absolutely certain beyond doubt you hear a difference ?
I'll check out your clip, .. Dynaudio's are usually a cut above (the ones I've heard in person), do have a history in studios and a great reputation so you are sure to have an excellent source to reference...
another thing to consider as an experiment in if polarity change is audible is to take a small crappy speaker like the one's that used to be found inside cheap portable AM radios (the small black ones) and flip the speaker wires and measure its response... if any speaker is going to reveal a difference in sound with inverted polarity, a cheap sub $3 speaker with limited frequency response and a primitive voice coil/magnet would right ?
So why doesn't it ? It's respomse will be uniform regardless of the polarity of the source fed to it...Surely a less capable speaker would stuggle more to be consistant in the negative phase of the waveform if that was so, but it doesn't, it stuggles equally to reproduce sound in both directions... the better quality speaker is more capable at producing a greater range of frequencies, at the same volume with lower distortion.