Yay PCM! I've honestly noticed that it is more punchy than the lossy 5.1. And in Pro Logic with a sub it's not to different from the 5.1 soundfield.
From what I've heard about the 5 Star boots they were just claiming to have that DTS audio and were just crummy upmixes.
The DTS audio discs that pop up occasionally accompany 35mm prints because there is no DTS optical track. The disc has to be put into a DTS decoder and then run with the print which has a specially printed time code to sync with the audio. No one has ever cracked the encoding and you have to have all the necessary equipment plus a print of the film.
What would the quality of one of these be though? I figured something like DTS Laserdisc (and early DVD) which was about 1500-1600 kbp/s.
EDIT: found this on wiki:
In theatrical use, a proprietary 24-bit time code is optically imaged onto the film. An LED reader scans the timecode data from the film and sends it to the DTS processor, using the time code to synchronize the projected image with the DTS soundtrack audio. The multi-channel DTS audio is recorded in compressed form on standard CD-ROM media at a bitrate of 1,103 kbit/s. The audio compression used in the theatrical DTS system (which is very different and completely unrelated to the home Coherent Acoustics-based DTS Digital Surround format) is the APT-X100 system. Unlike the home version of DTS or any version of Dolby Digital, the APT-X100 system is fixed at a 4:1 compression ratio. Data reduction is accomplished via sub-band coding with linear prediction and adaptive quantization. The theatrical DTS processor acts as a transport mechanism, as it holds and reads the audio discs. When the DTS format was launched, it used one or two discs with later units holding three discs, thus allowing a single dts processor to handle two-disc film soundtracks along with a third disc for theatrical trailers. The DTS time code on the 35mm print identifies the film title which is matched to the individual DTS CD-ROMs, guaranteeing that the film cannot be played with the wrong disc. Each DTS CD-ROM contains a DOS program that the processor uses to playback the soundtrack, allowing system improvements or bug fixes to be added easily. Unlike Dolby Digital and SDDS, or the home version of DTS, the theatrical DTS system only carries 5 discrete channels on the CD-ROMs. The .1 LFE subwoofer track is mixed into the discrete surround channels on the disc and recovered via low-pass filters in the theater.