I really dont think that it really is a 'catch all mode' :P
I am sure u know that the original DPL II is used to enhance stereo and Dolby Surround encoded soundtracks. I believe that DPL IIx simply builds on any 5.1 signal. So, for analogue 2 channel sources, the original 5.1 would be derived similar to the DPLII with enhancements to allow for 7.1 channel sound. Likewise, it would pull in a decoded DD 5.1 soundtrack and enhance it to allow for 7.1 channel sound. Of course, i m no expert (YET...hehe...I intend to work for Dolby within the next 10 yrs ;-) that is my life goal lol)

Quote Originally Posted by ronning
IIx...?
I'm considering between two different receivers for my next purchase - a yamaha and a sony. (probably the yamaha). The yamaha has IIx decoding and the sony only has II. IIx seems to be a rather significant improvement (although I believe both yamaha and sony have proprietary "upscaling" matrixing from anything to 7.1).

I'm a little confused, though.. Dolby actually wants you to use IIx for *all* recorded movie material - 5.1, ex, and even 2 channel?? Is it designed to be a "catch all" mode that you can just leave your receiver in and always have 7.1 sound no matter the DVD soundtrack??

Thanks,

Olen
...and I thought I knew everything about surround sound - until 7.1 entered the market