for those of you who power the 671 externally: is the polarity reversed, like on the UA-5? i know i saw it posted in one of these 671 threads but couldn't find it.
i plan on running some tests in a bit, but those who know: if i am using a power runner l-ion with the voltage set to 9-12v, will the 671 shut down when the voltage decreases to a certain level?