1. COMPATIBLE NL4FRX TYPE CONNECTORS: The right angle connector is compatible with NL4FC type adapters. As a professional plug for sound systems, it is an excellent choice to handle high current and stable signal transmission with angled design. 2. RIGHT ANGLE FOR CABLE PROTECTION: Compare to NL4FX version, the unique 90° offers extra protection for wire without bending or cracking. User-friendly rear part extension improves grip on latch. Airtight outer is touch proof to prevent electrical shock. 3. RELIABLE LOCKING MECHANISM: Twist and lock the adapter into socket of compatible device is a more reliable and safer. The trouble-free connection makes us no worry for any disturbing that unstabilize the signal transmission even in high-power situation. 4. 2 or 4 CORE WIRING CHOICE: The connector has screwed pins of +1, -1, and +2, -2. You can wire up 2-core wiring in +1, -1 or +2, -2 as positive & negative signal cable, or wiring 4-core wire as dual-channel or dual-line high power audio with speakon connection. 5. PRO SOUND SYSTEMS USE: Angled speakon connector is perfect for loudspeaker, bi-amplified cabinet connections if your equipment has the NL port. You can use for home audio setups, pub gig performance, music concert, church choir, club party, ect. Neutrik 2 4 pole spekon speak-on speakon connector plug cables end speaker amplifier audio pa dj stage cables cords plug Compatible with NA4LJ, NA4LJX, NL4MP, NL4MPR, NL4FC, NL4FX, NL4 & NL2 Series, NL2FC