Briefly, here are some additional details gleaned from bluray.com:
comments by rmorph: "The site owner deleted posts a few times before shutting down the thread..
I have some transcripts at http://www.stabbingpixies.com under "HTR Transcripts" for anyone thats interested."
As I understand from Audioholics.. the Lexicon fails basic THX spec requirements: Lexicon didn't see fit to alter in any way the Oppo player, even to bring it inline with THX standards.
Audioholics discuss finding the same limitations on both players.
THX have now begun a cleanup of what was previously a rather wide web campaign discussing the Lexicon as the first THX blu-ray player for this reason..
The Oppo BPD-83 "SE" , on the other hand, does make some improvements ( I can't wait for Audioholics to pull that one apart - and i hope it passes THX :-D):
Whether or not those improvements are good enough to make the spec or not, it got a bit funny when HomeTheaterReview reviewer claimed the Lexicon (BPD-83) was better than the Oppo BPD-83SE model.
THX rated the Lexicon as being THX approved: according to the technical tests, it fails basic THX readiness tests (because its an oppo) THX apparently just took the money offered by Lexicon without analysing it.
Oppo tells you what they changed in the audio circuitry between the BDP-83 and BDP-83 SE. It will be interesting to hear Lexicon's explanation of what they changed on the Oppo player before rebranding the unit.