This thread sent me on a trip to the way-back machine where I remembered this very subject being discussed over on AA.
This 22-year old thread recommends the positive wire to the MF/HF terminal and the negative to the LF terminal, and also provides some (humorous) explanations as to why cross-connecting sounds better.
In this other 22-year old thread, it is explained that Eichmann also recommended connecting the positive lead to the MF/HF terminal. That thread is part of this larger thread, which shows how the more things change, the more they stay the same.
If you look at the whole thread, the back and forth covers the listeners vs. engineers and marketing vs. reality arguments that still occur here every day. You might also notice the occasional appearance of industry professionals, like John Curl who enters the thread and discusses the use of transformers in amplifiers. Fun times.