Yamaha SM15V Owners Manual - Page 4

Connecting the Speakers I Phone Plug Wiring Phone plugs for connection to the phone jack inputs should be wired as shown to the right. Be sure to use proper speaker cable - NOT shielded instrument or line cable - for all speaker connections. I Neutrik NL4FC Plug Wiring If you will be using the Neutrik connectors for speaker input, wire the plugs as shown to the right. Be sure to use proper speaker cable - NOT shielded instrument or line cable - for all speaker connections. 1+ : HOT(+) 1- :COLD (-) 2- (NO USE) 2+ (NO USE) Neutrik NL4FC connector I Full-range Connection Each speaker features four input/parallel connectors-two 1/4" phone jacks and two Neutrik NL4MP connectors. Use either a phone jack or a Neutrik connector to receive input from your sound system/power amplifier. One of the spare connectors can be used to parallel-connect an additional speaker (keeping in mind the impedance considerations mentioned below). MIXING CONSOLE L GRAPHIC EQUALIZER L POWER AMPLIFIER L R R R SPEAKER SYSTEMS SPEAKER SYSTEMS Impedance Considerations When connecting speakers in parallel be sure to check the rated load impedance of the power amplifier. Most power amplifiers are capable of safely driving speakers with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-connected 8-ohm speakers have a total impedance of 4 ohms. The S112V/S115V/SM10V/SM12V/ SM15V/SW115V/SW118V are 8-ohm speakers, and two of these can safely be paralleled on one output. The S215V/SW218V, however, has an impedance of 4 ohms and should not be parallel-connected with another S215V/SW218V or any other model. These models can be connected in parallel, however, if you are using a power amplifier that can safely drive load impedances of 2 ohms or lower. 4