I recently got an 8-string guitar with Blackout pickups. I am still curious about the 'strange' sound I get when combining neck+bridge pickups (middle switch position), since it is pretty weak. So I checked the electronics, among other things, and found out that the pickups have opposite polarity/phase. I did this using a magnet and looking at the waveform once recorded. So this explains why the signal is so weak when I combine both.
The question is: are they supposed to be of opposite polarity? Does anyone know about this? I find it weird.