Will your speaker/amplifier accept a banana jack?
If so, I think Monster makes an adaptor for banana to spades. Your solution will not hurt but as you said, it is not optimum becasue you don't have much surface area to makes contact. Also, this arrangement will loosen up over time.
If so, I think Monster makes an adaptor for banana to spades. Your solution will not hurt but as you said, it is not optimum becasue you don't have much surface area to makes contact. Also, this arrangement will loosen up over time.