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I tried reversing the connections, but it did not change which of the two speakers was the + side. I confirmed this using the battery and trying it connected both ways... I had to change the internal speaker connection or flip one upside down which was not wife acceptable.. (looks stupid were the exact words).
Here are two links to discussions on dipole/ bipole speakers that should help with positioning and getting the + and - aligned correctly. Also, I think buried somewhere in these many pages is a direct reference from KEF and how they are suppose to now be labeling the Q800s L and R and assuring that they are matched pairs... getting them right makes a big difference in the null point/ sound field.
A Guide to Bipolar, Dipolar, & Direct-Radiating Monopole Surround Speakers (PART I) - Blu-ray Forum
A Guide to Bipolar, Dipolar, & Direct-Radiating Monopole Surround Speakers (PART II) - Blu-ray Forum
update to previous info about the faulty KEF Q800ds speakers:
I exchanged both emails and a few phone conversations with a gentlemen named Corey at KEF USA.
He was very gracious and sent the info I provided on to an "engineer" at KEF somewhere. The response (see below)was total BS and ignored the null point/ phase issue.. which was the whole point. They are admitting to nothing which is not surprising is it? Very ticked.... and would suggest that any poor sod like me that ownes a pair of Q800s do the switch or flip one over... and to anyone is considering the purchase of Q800ds speakers DON"T!
hers the response from KEF "At mid/high frequencies, the two drivers are arranged to work out of phase, resulting in complete cancellation from the drivers at the listener position. The idea is that the listener can't locate the source (due to the cancellation) and only hears the reflected sound from the surfaces around the room. This is what gives an impression of a surround sound field.
Here is a link to the same discussion over on the AV Forum
switching the polarity of the speaker wires has no effect on which of the two speakers in each of the Q800ds is the "+" or which one is the "-" in the Q800s... you can try it yourself using the battery test method....
Really ticked off about the whole issue and the less than weak answer from KEF.... The other funny verbal statement made was that the Q800s are only made for use as side surrounds and not to be used as rear surrounds.... a stupid statement at best.... like having a pair of out of phase side surrounds would be OK... And of course this was the issue that started the whole discussion to begin with....uneven sound caused by the Q800s being out of phase with each other!
The simple answer seems to be to just NOT buy KEF Q800ds speakers period! Shame on you KEF