My bass has active pickups. I know if there is a choice on an amp for passive/active input, that I should plug into the active one. My amp doesn't really label it clearly. There are 2 inputs. One is labeled "Hi" and the other "Lo". I don't have any manuals or anything for the amp.

It is a Tubeworks 7200 Mosvalve

My questions are:
1) Which one do I plug into? I would assume the "Hi" one, but it's just a guess.
2) Could I mess up the amp by plugging it into the wrong one?