Asus M4A78LT-M PLUS - Manual (Page 37)

8. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port.
Ensure that the audio device of Sound playback is VIA High Definition Audio (the name
may be different based on the OS). Go to Start > Control Panel > Sounds and Audio
Devices > Sound Playback to configure the setting.
The S/PDIF module is purchased separately.
SPDIF_OUT
GND
SPDIFOUT
+5V
M4A78LT-M PLUS
M4A78LT-M PLUS Digital audio connector
9. Speaker connector (4-pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
+5
V
GN
D
GN
D
Speaker Out
SPEAKER
PIN 1
M4A78LT-M PLUS
M4A78LT-M PLUS Speaker Out Connector
ASUS M4A78LT-M PLUS 1-27