Happy Holidays and Your Favorite Tips?

Yes, I'm being inclusive. 

What's your favorite tip to audiophiles?  Here is mine:

If you are using a subwoofer with ported main speakers, consider plugging the ports and raising the sub crossover.  Even if you don't have a subwoofer, sometimes plugging one or the other can really reduce bloat.  It's worth listening to it since it's cheap and non destructive (assuming you don't lose your sock in the port).