Speaker Polarity is an iPhone app that tests a speaker for correct polarity (sometimes called "phase"). See our new demo video of this module. This video was recorded in the simulator, and shows the module running within AudioTools. To use Speaker Polarity, you need to send our proprietary test signal to your speaker. Then, holding the iPhone near the speaker, the polarity is read using the internal microphone (located on the bottom of the phone). Speaker Pop generates the signal, and as long as you use a stereo tip-ring-sleeve 1/8" audio cable, and not a cable with a 3-ring connector, the iPhone internal microphone will still function.