10pcs Black Speakon 4 Pin Female Jack Compatible Audio Cable Connectors - Connectors - AliExpress
Amazon.com: NANYI Speakon to 1/4 Adapter Connector, Upgraded 1/4" Female to NL4FC Male Connectors are for Converting 1/4" Cables to NL4FC Plug for Speaker/Amplifier/Mixer (Speakon to 1/4 Adapter) : Electronics
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Amazon.com: CESS Speaker/Amp Speakon Compatible Female to Female Connector - Audio Speaker Jack Twist Lock 4 Pole - for NL4MP, NL4MPR, NL4FC, NL4FX, NLT4X, NL2FC, NL4 Series - (jcx) (2 Pack) : Electronics