ONKYO PC-1
¥8,000
Commentary
Phase checker.
The fact that the polarity of the entire playback system, from the amplifier to the speakers, as well as the speakers, is the same has a good effect on the grade of the playback sound.
The PC-1 sends an impulse signal to the speaker and detects the polarity by picking up the sound from the speaker with the built-in microphone.
You can also determine the polarity of the entire playback system by receiving a signal from the input of the amplifier.