JVC TH-C40 Instructions Manual page 61

Connections
7 Connecting the surround speakers —
Surround speaker (SP-THC50S) (2)
Red
Black
Do not connect the power cord until all other connections have been made.
TH-C50
Speaker
(bottom)
White
Black
7 Connecting the center speaker —
Center speaker (SP-THC60C) (1)
Red
Black
For TH-C40, the front, surround and center speakers are
equipped with their speaker cords attached directly to their
speaker unit instead of having speaker terminals on their cabinet.
Front speaker Surround speaker
(SP-THC40F) (SP-THC40S)
TH-C60/TH-C50
White
Black
Center speaker
(SP-THC40C)