This is also the only SR/TJ convert DVD with 24bit PCM audio.
Then there's the Blu-Ray version of Ultra C, with exactly the same audio template as Zazen.

And of course, the venue probably makes a difference too. Maybe they figured Ultra C wouldn't have any audible improvements from the audio being packaged beyond 2304kbps. They could have more than doubled that, without compromising the video quality.

bumping this thread to mention I recently found love in this.. when I was ringo collecting it completely escaped me that this was a recent/old release.

I relished in this Ringo for the day.