Samsung PPM42M8H Owner's Instructions Manual page 14

Connect the speaker audio cable to the external speaker output jack on the rear of the PDP Display
matching the "+" and "-" ends of the cable with the diagram on the PDP Display.
➢
◆ The speakers MUST have a power handling capability of 10 watts minimum (impedance 8Ω).
◆ When you connect the speaker wire to the external speaker out connector, first bind the
speaker wire round the ferrite core to secure it.
English - 14
Ferrite Cores
The ferrite cores are used to attenuate undesired signals.
When connecting cables, attach one of these ferrite cores to the cable
near the connector.