Dom,

I just finished looking at the link you provided. It looks good as far as the original THX (now Ultra1) and Dolby Pro Logic (one) is concerned, but bear in mind it was last updated in Nov '97 and doesn't address the numerous changes since then.

For a quick, not too detailed breakdown of Home THX Ultra(1) and Home THX Select, you can also check out the "official" (ooh!) description at [Link: thx.com]
This link does not address some more technical questions (darn it!), nor does it talk about THX-ES, nor Ultra2.

BTW, in addition to power ratings another difference between the Select and Ultra processor standards is that Select processors are not required to include the de-correlation circuitry.

-Bruce

This message was edited by Bruce Burson on 12/19/01 06:22.16.