Speaker Polarity Testing

To positively insure your speakers are not phase reversed from the factory or after a repair, test them with a 1.5 volt dry cell battery. These are the same as used in a common household flashlight. Connect the plus terminal of the battery to the plus terminal of the speaker, and likewise with the minus terminal. The moment both terminals are connected, the woofer should make a very small forward excursion. If both speakers test the same, they are both in phase. The same test can be done through the speaker wire, to insure phase accuracy of wire and speaker together. Just connect the battery in place of the amp, with plus to plus as described above. This is useful if the positive and negative leads are enclosed within in a single housing, where you cannot visually verify that the color code or markings are correct.

Let me reiterate that about half of the CDs out there have the absolute phase reversed. Everyone needs a component in their system with a phase reversing switch as the difference can be startling. There are some previous threads on this subject.

I do not intend to plug an item I have for sale on the site...but if you REALLY want to be sure, the best way is to use the Sheffield Labs/LAX polarity tester and test track CD. Not only will it measure relative polarity, but it will also tell you if the absolute polarity of your system (or a given recording) is off. Fun and useful if you do a lot of component swapping..and very useful if you amp and/or DAC/CD Plate allow you to switch absolute polarity. Alas, my preamp don't do that, and i just sold my Muse 296, so it don't do it for me anymore.

What about if you have a test CD tell you to reverse the leads on one of your speakers - i.e. that one speaker came from the factory out of phase?
Could there be any other problem?