Two 16 ohm speakers in parallel will give you an 8 ohm load. It's mono, so all you need is a mono jack and plug. There are a few different types commonly used. I have heard of 6.3mm phone, 3 pin Canon, and neutrik, all being used. For home and light use, the 6.3mm phone jack/plugs are cheap and work fairly well. However, once, on a powerful, well sealed cabinet, I had troubles where the air pressure from the speaker, on loud transients, caused the 6.3mm jack to "bounce" in it's socket and caused horrible sounds as it disconnected the signal momentarily. Not good for the amp either. So, I often use canon plugs (same as used for balance microphones), in bigger stuff.