Can you PM me or post a link to the Pomonas???
http://www.pomonaelectronics.com/index.php?i=prodsub&parent=HWARE&cat=BANANAPLGJCK&getDetails=0
I have used the first item on some speakers that connect to the amplifier they sit on.
I usually use the dual banana plug like the yellow one on page 2 but I don't have any yellow ones. Red and Black mostly and I don't worry about using specific colors for whatever channel. They have about ten colors if you need that.
I bought some of the imported crap dual banana plugs and if a full size chunk of wire is inserted the threads of the retaining screw do not bite and it will not work. I had to grind off the tip of the screw. Pomonas are fully threaded.
I bought some of the imported crap dual banana plugs and if they are put into a jack that is tight the banana will peel, losing its skin, just junk, I say.
The Pomonas just work. If they need to be tightened, just use a jewelers screwdriver and pry out the four chunks of peel in the middle all the way around and go as new. If these, without some fancy gold plating are good enough for Tektronix, Hewlett Packard and other test equipment manufacturers, I'll let em handle a stereo signal.
This brand is available at a number of retailers like Mouser, oh wait, let me just say all the big electronics houses.
Now to be on topic, many think bare wire is the best and spades can be held in a 5-way binding post very well with a good tightening of the post. But I have numerous speakers that have banana jacks (DCM Time Windows), Magneplanar (with a side screw for using bare wire or tightening onto the banana plug) and a number with 5-way binding posts.
Dual banana plugs allow easy speaker switching and there is no chance of the + and - sides touching each other.