Pioneer GM-X554 Owner's Manual page 11

Two-channel mode (Stereo)
RCA input jack A
From car stereo (RCA output)
Two-channel mode (Mono)
RCA input jack A
From car stereo (RCA output)
Input Select Switch
Slide this switch to the left.
Connecting wire with RCA
plugs (sold separately)
Input Select Switch
Slide this switch to the left.
Connecting wire with RCA
plugs (sold separately)
Speaker (Left)
+ ≠
≠ +
Speaker (Right)
Speaker (Mono)
+ ≠
≠ +
Speaker (Mono)
10