Originally Posted by desertdome
When you look at the back of both of the subs, the right binding post is positive and the left is negative. The right binding post should also be red and the left black. On one sub, the binding post is reversed and black is on the right and is positive and red is on the left and is negative. You can't just reverse the binding post. You also need to reverse the wiring. Alternatively, you can just connect your positive speaker cable to black and the negative cable to red.
That is what I thought you meant, but then I wasn't sure which was correct and which was wrong. I wound up taking off both sets of plates and checking the wires running to them. In both cases, the black internal wire was going to the black post and the red internal wire was going to the red post. Now that doesn't necessarily mean they are right, it is possible that Jeff wired the black and red incorrectly at the back of the driver, but that seems doubtful and I have no way to check that short of taking out the drivers.
What we did last night was wire up the first one normally, play it and listen to the level. Then swap polarity and listen again. The level audibly dropped off so we swapped it back to "normal".
Then we added in the second speaker, we assumed this was the wrongly wired one, so right at the start we set the red wire going to black and the black to the red post. We then watched some of the movie and again paid attention to the level of bass, we then paused the movie, swapped the wires around, and listened again. This time there was a noticeable INCREASE in bass, so we left it alone. That seems to mean that both of them are wired up correctly internally, but one of them simply has the entire plate flipped in a 180. If that explanation makes no sense, I'll show you next time you are over.
Now that you have me thinking about it, and it has been years since we wired up that Danley, it could be that one of the Danley sets of wires is reversed at the back of the amp. Those internal drivers are in a push/pull configuration right? I can't remember if I swapped polarity at the amp side or at the Speakon side.