4 pole chassis connector for 40 A rms continuous, 50 A audiosignal duty cycle 50%. Black D-size flange, countersunk thru holes, 1/4" flat tabs. The speakON panel mount connectors are the standard chassis connectors for loudspeaker/amplifier interconnections. They feature a unique metal locking system, making contact only once fully locked. The speakON receptacles are robust, versatile and easy to terminate.