I think the ideal A/B test for speakers would be, first you listen to Norah Jones sing a song (A). Then she sits down with you and you listen to the same song played through your sound reproduction system. (B) If they sound the same, then it is a good system. Competing systems are graded by how true to the original source material they come.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.