It's actually a DVD soundtrack selection, ie go to "setup" in the DVD menu and look for a "DTS" option. Sometimes DTS is another "language" in the menu.

The receiver has to support DTS decoding but I think pretty much every receiver on the market decodes DTS these days.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8