So, I got one finally, it's an original version SN# T0449. There's a DC connector added just above the power cable. Does anybody know why they would have done that? Is this something that was common by some? I have already tested the unit on AC power and it works just fine. I'm just curious about the added DC connector and why they would have done that.
![mesa1_zpsnq78dqmg.jpg](https://proxy.imagearchive.com/dbf/dbff89a39d9d6c15924b824a1643a261.jpg)