Aaeon EMB-BSW1 Manual page 26

16. Internal audio connectors (2-pin SPK_L1, SPK_R1)
These 2-pin connectors are for audio connections. Connect the audio cable
to these connectors for Line Out and Rear Speaker Out functions.
SPK_L1 SPK_R1
EMB-BSW1
PIN 1 PIN 1
EMB-BSW1 internal audio connectors
EMB-BSW1
2-18