Just connect both spades on the speaker end to the proper posts.
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Redo connectors at speaker end :
(i) remove all 4 spade connectors first;
(ii) then combine and twist like cables together;
(iii) then re-solder /reconnect with new banana or z-plug connectors. I prefer quality gold plated compression plugs (including WBTs) that fit snug and no soldering req'd