Audioquest makes some adapters that you may be able to use. I have some and what makes them so good is that they are very simple, but high quality. They're very small and accept a spade on one side and the other side is a banana. The only problem is that I haven't seen them in a while and forget if you can stack them. (That's when one banana goes into the speakers binding post and the other banana plugs into the back of the first banana). I got mine from The Cable Company. I would call them and see what they have. They're inventory is huge and will most likely have something that will work for you.
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