Bananas rule, spades drool. End of discussion.

There are such things as SOCKETS to TIGHTEN stuff. 

On my FIRST DIY speaker, I simply used copper screws and nuts. As with EVERY bolt on your car, proper tightened with a socket and a wrench, they never come loose, and provide gigantic contact area. 

SO, we we can twist off that childish hand know, figure out what thread size we need, we can then just order us nice nuts. For purist who buy pixel dust by the pound, we could even do soft copper or aluminum (nah, gold) WASHER (to be confirm to the uneven contact surface of the spade; same reason your oil drain plug or banjo bolt on the car have a soft metal washer) and put a stainless nut on.

Since I abstain pixel dust, and constantly plug in/out/move/change my system, I just suffer the terrible sound those bananas provide. 

@akgwhiz  I remember asking for a no solder banana recommendation, and I might have even asked for a spade.  Eventually I went with some affordable silver plated bananas recommended to me by another A'goner and they were perfect for the 12 and 10 gauge cables I needed to make.

I want to put in a vote of agreement with E_S, with one qualification…BFA bananas, not the regular spring loaded kind, whose metal quickly fatigues. Screw-lock or Cardas’ with the little rubber plug to maintain contact are OK too.  The problem with spades is the increased chance of causing shorts due to the lack of any standardization in how they fit.  Old school barrier terminals fitted with correct spades are great, but not what most of us have.

BTW, I'm sure you can get good spades to stay tight... but if you ask me over all the time I've been working with speakers, plugging and unplugging them and troubleshooting them, bananas have been head and shoulders more reliable.

Oh, and PS, the contact area of a split banana is quite large.