I got bored and started reading through the manual for my Ampeg SVT-3 Pro head and came across a labeled diagram of the rear panel. To connect my head to my cab I usually use one of the two 1/4'' speaker output jacks with a regular speaker cable, but above them is this bigger looking output hole that I just kind of ignored. It says that this is the speakon jack and that I should use it while playing at full output. Since I make a habit of playing at "full output" at gigs and practice, it occured to me that I might be doing something wrong. It says something about using heavy gauge cables and that the pin connections are 1+ and 1-. What exactly does this mean and what do I need to use this jack.