Sony PHA-3 Help Manual page 50

Turns off
The headphone amplifier is being input with;
the linear PCM digital signal of sampling frequencies under 48 kHz
the analog signal
Lights up
The headphone amplifier is being input with;
the linear PCM digital signal of sampling frequencies not under 48 kHz
the DSD digital signal of the High-Resolution Audio format
DSD indicator
Turns off
The headphone amplifier is being input with;
the linear PCM digital signal
the analog signal
Lights up
The headphone amplifier is being input with the DSD signal of the High-Resolution Audio format.
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