I bought a pair of speaker cable from Klaus at Odyssey, and he said banana at amp end, he said it sounded better to him, he should know, i use his amps.
Ryriken - Many amps don't support bananas. My old Cambridge A3i supported only spades. My current Rowland 102 (and perhaps all current Rowland amps) have Cardas style clamp - for spades only.
As for the sound, if there is any difference then according to people opinions the best is bare wire (not always possible) then spades followed by bananas.
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