Rogue Metis speaker polirity

I found a couple of reviews and neither one mentions that the preamp inverts phase.  If it did, I'm sure the reviewers would have said.  There are some preamps that do indeed invert phase, but I don't think this is one of them.

https://www.hifiplus.com/articles/rogue-audio-metis-preamplifier/

http://www.soundstage.com/revequip/rogueaudio_metis.htm

( The Rogue Metis definitely Inverts)
 Flip both speaker leads at the speakers

 Best JohnnyR
 Audio Connection
 

Thank you John. Bill at Rogue confirms that you do need to flip the leads. Just didn’t understand why no mention in the manual or any of the reviews I read. Once again thank you for all your help. Audio Connection and Rogue both give fast, friendly service I recommend them both highly.

Would someone explain why some preamps invert polarity?  Seems it would be just as easy to not wire them that way.  Thanks

Here ya go!
http://www.gcaudio.com/resources/howtos/absolutephase.html