As long as both channels are the same, it will not matter. As you said yourself, there was little effect in changing polarity.
about 5 years ago
Its my understanding that many tripath amps invert the speaker polarity. On my T2 is the speaker output labelled positive actually the negative? Or does hifimediy label the boards accordingly? Ive experimented with switching the speaker output polarity with little effect in sound. Which do you recommend and why?