I install home theater and a little trick we use to locate which speaker is left/right/center etc., is to hook up the speaker....go to the "home run" run of speaker wires....skin them....take out a AAA battery and touch the leads together to get a nice little "pop" letting you know know which speaker wire you hold in your hand.
A few weeks ago we finished one where the customer took his old pair of Klipsch La Scalas (the...ummmm..."portable" version of their corner horns) to use as his front Left/Right.
When I used that little 1.5 volt AAA battery on them, you'd have thought a cannon had gone off...LOL!
