The Speakon connector is used by audio professionals for connecting speakers and amplifiers. With safety lock based on two notches that must match the plug and the socket. After inserting the connector, you have to turn it a quarter turn to the right to move horizontally slots and so the piece is secured against inadvertent cable pulls. Cable rangeSpeakON based speaker 4-pin connectors (2-way). Section wires each 2.5mm.