Well I was trying to plug in 3 lots of single wire and 2 lots of bi wire Chord carnival silver+ speaker cable into the back of my Denon amp. After trying for about 30 mins and strugiling due to the thickness of the wire I bought alod of cheap banana plugs. Once these where fitted to the amp side only it was a hell of a lot quicker and easier to plug them in.
The plugs are gold plated, and they where the screw on type so no soldering involved. I don't think you would notice any difference in sound quality from not using them. But they do make it alot easier.