If you reverse the leads on only one speaker, you will be out of phase, and your imaging will be wrong. This can be easily checked with any available test disc. It's pretty easy to hear. A single vocal will not have a centered image, but will instead be split across the soundstage.
Absolute phase is something different. To reverse absolute phase, you reverse the +/- leads on both speakers. Absolute phase is more difficult to hear, but it's easy to experiment. BTW, you can reverse leads at the amp instead of the speakers with the same end result.
Absolute phase is something different. To reverse absolute phase, you reverse the +/- leads on both speakers. Absolute phase is more difficult to hear, but it's easy to experiment. BTW, you can reverse leads at the amp instead of the speakers with the same end result.