So my pop's has a ton of old stereo equiptment, including two enourmous (and I mean huuuuge, they must have been for a stadium/concert or something) speakers in the living room. And he also has these smaller speakers, which I can remember him adamantly claiming that these are far louder then the big'ns could even dream of being. I finally decided to drag them out and put that to the test - and immediately hit a road block....
What the hell are these inputs? It's a set of two, both are labeled the same. I can handle matching up '+'s and '-'s and that's about it... and these ancient things go and add letters and numbers into the mix?! I'm baffled. Any info is much appreciated!