That is strange. This is from the owners manual!
6 SPEAKERS • Connect the right speaker to the terminals marked “R +” and “R-” ensuring that the “R+” is connected to the “+” terminal on your loudspeaker and the “R-” is connected to the loudspeaker’s “-” terminal. Connect the terminals marked “L+” and “L-” to the left speaker in the same way. • Always use heavy duty (16 gauge; 1.5mm, or thicker) stranded wire to connect loudspeakers to your C 316BEE. The high-current binding post terminals can be used as a screw terminal for cables terminating in spade or pin sockets or for cables with bare wire ends. • The C 316BEE is designed to produce optimum sound quality when connected to speakers with impedances within its operating range. Please make sure that all the speakers are rated 4 ohms minimum per speaker. 7 AC POWER CORD
6 SPEAKERS • Connect the right speaker to the terminals marked “R +” and “R-” ensuring that the “R+” is connected to the “+” terminal on your loudspeaker and the “R-” is connected to the loudspeaker’s “-” terminal. Connect the terminals marked “L+” and “L-” to the left speaker in the same way. • Always use heavy duty (16 gauge; 1.5mm, or thicker) stranded wire to connect loudspeakers to your C 316BEE. The high-current binding post terminals can be used as a screw terminal for cables terminating in spade or pin sockets or for cables with bare wire ends. • The C 316BEE is designed to produce optimum sound quality when connected to speakers with impedances within its operating range. Please make sure that all the speakers are rated 4 ohms minimum per speaker. 7 AC POWER CORD