Product Features
This phase meter can test all speakers of all car.
Comes with a CD which includes 4 section test music.
Perfect for healthyly troubleshooting and testing audio systems.
Help to adjust the speaker and amplifier wiring of the car audio system.
Can test all speakers of all car, such as small treble, door speakers, subwoofer, etc.

Specification
Material: Plastic
Color: Black
Powered By: 1 x 9V 6F22 Battery (not included)
Package Content: 1 x PH Phase Meter & 1 x Test Audio CD

Four Sections of Test Audio
> The first section: left channel noise signal (if the right speaker has a noise signal when playing the first segment, it means that the left and right channels are reversed).
> The second section: right channel noise signal (if the left speaker has a noise signal when playing the first segment, it also means that the left and right channels are reversed).
> The third section: phase detection signals (If the green light flashes once and the red light flashes 3 times, it means that the output of the speaker is negative phase, that is, your speaker wire is connected upside down).
> The fourth section: same content of the third section (If the green light flashes 3 times and the red light 1 time, it means that the horn output is positive phase, that is, correct).

Operation Steps
1. Put it in car cd player, and play section 1 (left channel )or section 2 (right channel) to check if left / right channel connection is correct.
2. Play section 3 or Section 4, the sound speaker will produce a fixed frequency signal, then press 'test' button.
3. If 3 green light flash and 1 red light indicates that the speaker output is in positive phase (correct connection).
4. If 3 red light flash and 1 green light indicates negative phase (reversed connection).
5. When the yellow light is on, it means the tester is running low, please replace the battery.