The chair will have to have its own amplifier, but connecting from 3.5mm from the TV, use your remote and tap in the following:
MENU > SOUND > Speaker Select > External Speaker
Does that help?
Have been trying to wire up a gaming chair (Rocker)and only option for the PS3 if to keep to HDMI quality is to use the above jack. All options work but involve using componento or composite connections.
How do I enable the 3.5mm audio out jack please?