Check the listing for details. Neutrik NL4MMX Speakon Cable To Cable Adapter 4-Pole. Condition: New. Listed at 6.54 USD. Neutrik has engineered the 3rd generation of their world standard professional amplifier/loudspeaker connectors with speakON® SPX Series Professional Loudspeaker and Amplifier Connectors. Assembly is now faster and easier with less parts to handle and a redesigned insert that does not require any special tools.