Banana!
Spades need a fastening every period because they get lose.
This type are the best:
https://www.ebay.com/itm/10PCS-Nakamichi-Gold-Plated-Copper-BFA-4mm-Banana-Plug-Male-Speaker-Connect...
This type of spring is making the best, long lasting contact, with maximum surface contact with the binding post.
Spades need a fastening every period because they get lose.
This type are the best:
https://www.ebay.com/itm/10PCS-Nakamichi-Gold-Plated-Copper-BFA-4mm-Banana-Plug-Male-Speaker-Connect...
This type of spring is making the best, long lasting contact, with maximum surface contact with the binding post.