Stereophile test CD2 In/Out of Phase test:question

I never looked at the booklet before. If you only listen to the CD then my assessment is correct. Track 2 is labeled "channel phasing, not absolute phase. "Having "a clearly defined central image" as the recording tells you to listen for has only to do with the speakers being in phase with each other, not absolute phase.

Then if you read the booklet the discussion is all about absolute phase. So it appears that it can be used for both.

It is probably the common confusion in the booklet as it is played "in" phase and then "out of" phase. If it is really one channel out of phase with the other, which channel would be reversed for "out of" phase?

Tbg, it really is one channel out of phase (actually inverted polarity) with the other on the recording and then the two channels are in phase. If you reverse the wires on just one of your speakers the image will be centered when he says the signal is out phase and diffuse when he says they are in phase.

Your question is the tricky part. Once they are both the same polarity (image centered when he says they are in phase) the idea is to listen to the part when he says they are in phase, then reverse both speaker leads to invert the polarity and try it again. The bass should sound more natural one way or the other. As Rives pointed out, some people are more sensitive to this than others. Or perhaps some know what to listen for and others don't. I've never tried it, but I will later today to see if I can hear the difference.

how can you tell which binding post on the speakers is + or - if they are not marked. I have altec horns and can remove the backs. Thanks

Lvk47, I thought I had posted this, but I guess not.

Take a D cell battery and connect the bottom to one of the leads to the drivers. Then just touch the top + of the battery to the other lead. If the driver moves forward that is the red or hot end. If it move backward, the lead to the + is actually the neutral.

Herman, what you say is contrary to my experience.