Hello all from a total newbie here. Great forum and have enjoyed browsing. I have a couple questions about a single speaker I scored from the free pile at our recycle center today. The speaker is labeled AR-1 and the box is in un-finished condition. The serial # is 07979. The speaker appears to be in fairly good condition except the grill is a bit stained. There are quite a few connection options on the back which is my first question. How to connect to a basic Yamaha SS amp. My worry is ther