Invert ?

@mwh777  +1. Great explanation

Pual Mc educated me decades ago, except he incorrectly calls Polarity Phase, which he admitted. I  first learned about it when I had Genesis Vs with powered sub, which had RC of volume and Polarity. I discovered the biggest offender was bass Polarity. If you're looking for a sub IMO, best is one with RC of Polarity. That said Polarity/phase on a remote preamp or integrated is very meaningful to my ears

hth

Play some music you know that has good bass (make sure your speaker cables are connected correctly). Flip the switch and listen for any change to the bass. whichever position has the most bass is the correct polarity. 

@ everyone. Ty for all your explanations. Very interesting. 

@larryi +2 Thanks!

Mike

@tattooedtrackman,

See article below:

Mike

https://www.justmastering.com/article-phase-and-polarity.php

You should get one of these to stop yourself from going crazy listening for the effect