So here is my rather crude explanation --A Wilson cross over is second order which will create a 180deg phase lag on the low pass driver compared to the high pass driver. So lets start with the bass driver connected in normal polarity------ the signal goes through it and emerges 180deg out of phase at the mid - in order to counter act this the mid is wired reverse polarity --once the signal has passed through the mid the tweeter sees 180 deg phase lag compared to the mid and is wired the opposite of the mid to correct phase ---so the same as the bass driver (standard polarity ). In the end the Phase remains the same but yes the mid is wired reverse polarity .
hope it makes sense----and hope I got it right !
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