Works as advertised!

I recently hooked up surround speakers in a house that was pre wired for them. Unfortunately whoever wired it chose to use plain wire without any indication of positive or negative.

I was strongly suspicious that my speakers were wired backward, and I found this app.

Sure enough one of the surrounds was out of phase, and after fixing it they sound dramatically better!

This is one of those apps that is well worth the 5 bucks. Im very pleased. Thanks!

DS Leadfoot about Speaker Polarity, v3.0