Sony VPLL-3024 Fixed Short Throw Lens (2.34:1 to 3.19:1) - Manual (Page 202)

Help Guide
Linear PCM Recorder
PCM-A10
The volume of the audio you recorded from an external device is low or you hear
squeaking noises when you listen to the audio via the built-in speaker.
If you record audio from a monaural external device that is connected to your linear PCM recorder with a stereo
connection cable, playing the recorded files may sound low in volume or make squeaking noises when you listen to
the audio via the built-in speaker. This is because the left and right audio signal output is reversed in phase, and
does not indicate a malfunction.
Be sure to use an audio cable with a monaural plug to record audio from a monaural external device.
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