How To Wire a 100v Line Speakers System RS100 Background Music System
From the amplifier, you are only using 100v Output ( positive ) & Com output ( Negative )
Cable to 1st Speaker 100v from amp to RED on speaker and then COM on amp to BLACK on Speaker, make sure the speaker is set on a power tapping ie 6w and NOT 8ohm
Next speaker just link from the 1st to the next speaker, and so on.
The cable does not come back to the amp from your last speaker. It ends at your last speaker.
For more help on understanding 100v line speaker systems see here for more information