Polarity on a non-bladed plug?

The correct way to orient a 2-prong plug is to try both ways and see which way sounds better, if indeed one way sounds better. Sometimes it will make a difference, sometimes not.

Rlawry thanks for the reply. I had thought of that but figured some input from others would be helpful. I'll give it a try.

There are ways using a multimeter to measure the current between the chassis of the component a known ground, but I never worried about how to figure it out. Maybe your component does have some way to figure which side of the cord is ground, but in my book the sonics are what matters most. I have also been able to reduce 60 Hz hum on components by plug orientation, particularly digital ones.