I personal don't think there is any difference in the sound between Spades and Bananas. But as for tighter connection I think the Spades works the best. It all really depends on your speakers.
I agree with Bill as I have used good examples of both in soldered and solderless form. I do however think that a bare wire connection sounds different, better IMO.
Connectors do sound different, and in the case of speaker cables, the connectors both on the cable and the amp and speaker are very very important. But there are good banana connectors and bad spades, and vice versa. I like the WBT bananas much better than their spades for example. A great buy, by the way, are the very inexpensive Audioquest spades.
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