UNKNOW 4 pin connector
This connector is used in PA and home speaker connections.
|1+||Positive 1||This pin carries the signal from amp to the speaker|
|1-||Negative 1||This pin carries the negative back to the amplifier (of channel one)|
|2+||Positive 2||Second positive from amp|
|2-||Negative 2||Second negative back to amplifier from speaker (of channel 2)|