I've tried literally dozens of various adaptor/connectors and because I regularly pull out the bananas from my main speakers when I re-route the sound to my kitchen speakers, I've found most standard banana adaptors 'loosen up' over time and become very loose in their receptacles.
These ones I have found to not only maintain their incredibly tight connection, but also to be the ones able to be tightened onto the spade the hardest.
http://www.musicdirect.com/product/72732
Good luck.
These ones I have found to not only maintain their incredibly tight connection, but also to be the ones able to be tightened onto the spade the hardest.
http://www.musicdirect.com/product/72732
Good luck.