4 Pole NL4 Plugs: Speakon connectors are popular in the audio industry because they can be locked securely and can handle high currents. They provide a better connection for PA, amplifier and console, and can be used for concerts, gigs, and band shows 2 or 4 Core Wiring Option: The NL4 plug has 4 terminals and can be used for multi-channel connection. You can use 2-core wires to connect +1 and -1 as mono connection, or connect +1, -1, +2, -2 together with 4 conductor wires for dual channel audio setup Unique Latching Design: The NL4FC connector incorporates a reliable twist-lock mechanism that enables swift and secure locking. This design offers a reliable and stable connection, reducing the risk of accidental disconnection and electric shock on stage Durable Insulated Housing: Made from high-impact plastic, providing anti-slip and wear-resistant properties suitable for tough conditions. It also reduces dust build-up and prevents static interference, extending the audio device lifespan NL4MP Panel Socket: This is the standard female mounting connector for sound equipment interconnections. The airtight design and precise keyway locking structure ensure that the socket is dustproof and noise-shielding, thus enhancing overall performance Complete Connector Kit: Package includes 4 sets of speakon connectors with 4 pieces of 4 pole SpeakON twist lock plugs and NL4MP panel mount sockets in blue color, compatible with NL4FC, NL4FX, NL4MPR, NL4 and NL2 series audio cable adapters 4 pole speakon connector blue & socket package