Audio Connectors - Speakon Connectors 4 Pole - Chassis (receptacle) - Neutrik locking Speakon Loudspeaker connector, 4-Pole, Chassis, D-Style flange. Speakon cable end connectors lock into Speakon Chassis connectors. Speakon locking feature reduces significantly the possibility of disconnection. Speakons are great for professional sound reinforcement type applications for PA systems, amplifier to Speaker.