2 Spades are great, 1 spade and 1 banana is fine also.
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Another possibility. Take a peak behind your binding posts to see how they are connected. You might be able to double-up on one binding post there. I have found that any connector will degrade the sound. I'll also read the same wire should be used for your jumpers as the spk. wire you are using. I will say that in my experience using diffent jumper wires will affect the sound. Reread your question. I personally would use a spade both top and bottom.