LG L1753HR Owner's Manual

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Connecting  the speakers - 
The feature is only for speaker models - L1753HM, L1953HM
A3
Connecting the speaker
1
Place the monitor with its front facing downward on a soft cloth.
2
.
Insert the protruding hook of the speaker in the direction of the slot in the back of the product.
DC-OUT
D-SUB
DVI-D
AC-IN
DC-OUT
D-SUB
DVI-D
AC-IN
Hook
Slot
Audio DC-In
Cable
AUDIO IN
3. 
After setting up the speaker, connect the Audio DC-In Cable to the back of the product. 
DC-OUT
D-SUB
DVI-D
AC-IN
Audio 
D C - O U T