phase issue

I was over at at a friend’s place listening to music and thought I heard his speakers out of phase. We played some test tracks and confirmed that the speakers were out of phase. i suggested we switch the + and - terminals and we ran the test again but the speakers remained out of phase. We did a...

Salesman tried selling me expensive cables. He connected some streamer to emotiva pt1 then basx 300. He then rotated cable and sound was way different. I have hard time figuring out what happend. Of course he said that the reason why I don't like those speakers is because all my installation in...