William, I agree with you in that, but there could be also others reasons, and one of them, could be that maybe they, in fact, are not the same product, as everybody believes, or maybe a very similar product, the measurements are not the same for both, you saw that, and IMO THIS IS an evidence, right? But also yes, IIRC, they are still in the same case, IIRC they still have different msrp, so if they are the same, this could be considered as a fraud, right?
And maybe at the end, they are, I do not say that they could not be the same, just that this statement is too serious to be sustained like that, and the fact is, that NOBODY HAD PROVED that, and someone had provide some evidence of the difference in sound, if someone write to Sony, and get an answer please let us know, I would like to see them agreed in a fraud....
OTOH some people belive also that the 7509 and the V900 are the same, and they are not, I had both, opened both, and IIRC, it was long time ago, they were slight differences between both drivers, IIRC, the drivers on the 7509 are more similar ot the V700DJ, that to the V900 in fact...