Polarity on Gamut Phi Loudspeakers

Making sure the speakers are 'in phase' is, IMO, more important than the absolute phase of the speaker.
You can and should do that by ear.

Once in phase, swap both speaker wires or use the phase switch on the pre to determine if you have a preference. That'll also change by album or even song if you can hear it at all.

Magfan, I find myself switching the phase on my DAC for certain CD's, it really can make a large difference in the soundstage.

Face:
When I tested....Most rock zero response. Apparently too many inputs and not enough attention to coherent phase in the recording process.

Some solo instrumental, it makes a difference. Live albums? That seems to work sometimes, too.

I took an online test using earbuds, which I know not to be 'best case' and scored 50% correct. Maybe I'm not sensitive to this phenom.

It may not help that I am a 'set and forget' type. The remote for the amp, with the phase control is over on a shelf......somewhere........It may not even have batteries installed, since it it so infrequently used.

As far as the original post:: The speakers can either be identical or 'mirror image'. So, looking at the back of the speakers, the posts can be A/B//B/A or A/B//A/B. That's why I recommended starting with getting them in phase. The rest? Have fun! Swap the leads around to hearts content.