These are the connectors that are used for Speaker Cables

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Neutrik NL2FX Speakon

http://www.neutrik.com/en/speakon/nl2fx

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Neutrik NL4FX (bridging)

http://www.neutrik.com/en/speakon/spx-series/nl4fx

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Neutrik NL4FRX right angle

http://www.neutrik.com/en/speakon/spx-series/nl4frx

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Rean NYS225

http://www.rean-connectors.com/en/products/1/4-plugs/nys225

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Dual Banana

http://hosatech.com/product/bna-260/

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