This, apparently:
DTS-HD Master Audio Essential provides the same quality high-end sound offered by DTS-HD Master Audio, and is a full Master Audio feature set for Blu-ray Disc, with the exception of DTS ES Matrix and NEO 6.
Although DTS-HD Master Audio Essential does not currently support DTS | 96 /24, DTS ES, ES Matrix, and DTS NEO 6, for standard DVD discs, it offers DTS backwards compatibility, allowing you to enjoy DVDs in high quality DTS Digital Surround.
According to Pioneer's specs for the LX52.