All Jeff Rowland amps use Cardas clamp for spades (or bare wires). It does not accept bananas. It creates extremely strong connection and rotating spade won't make it loose. I have small Rowland 102 with speaker connector and it is great (other than not accepting bananas).
Bananas rule, spades drool. End of discussion.
I just checked my speaker connections. All using bananas, all nice and tight.
The number of times I’ve had spades get loose instead though.....
Point is, and it really is kind of a tongue in cheek thing, bananas beat spades for long term reliability in almost all setups. If you have to use a Cardas or Mundorf speaker terminal to ensure your spades stay tight it kind of proves my point.