BoB:

You're entitled to your attitude about Dolby Labs but, in fact, they didn't develop DPL2. The technology was created in the analog domain by Jim Fosgate -- the surround synthesis pioneer who created the original Tate/Fosgate decoder back in the 1980s.

The Dolby Lab programmers implemented Jim's tech in the digital domain under his guidance. And to his specs.

Everyone it entitled to dislike DPL2, of course; but I wanted to make it clear that one of the giants of audio, IMHO, actually created DPL2 and it represents his magnum opus in this area. It is MUCH MORE than just DPL with full-range surrounds.