Audio Power Source Setting (J7); Table 2-5: Audio Power Source Setting - Advantech PCM-9550F User Manual

2.17.3 Audio power source setting (J7)

The PCM-9550F/FM is designed to work with a single +5 V power
supply. The audio interface can also function normally under
single +5V power supply, but most audio controllers require an
independent power source generated from a +12 V power supply.
The independent power source avoids the noise from the other
digital circuits. The PCM-9550F/FM's audio interface can accept
+12 V power to provide improved quality audio. This is done via
J7.

Table 2-5: Audio power source setting

*+5 V +12 V
1 2 3 1 2 3
J7
* default setting
Configuration of the audio interface is done entirely via the
software utility. You do not have to set any jumpers. Refer to
Chapter 6 for audio setup details.
2 6 PCM-9550F/FM/L User's Manual