The only other thing I've found is the Pioneer SE-DIR800C, but it's a discontinued wireless headphone system.
Fortunately, the Dolby Headphone DSP/DAC/transmitter box is said to actually have an analog output, so you're not forced to use that particular set of wireless headphones. It even has the DH1/DH2/DH3 room mode adjustments.
Unfortunately, the eBay prices are stupid high, as in $300+, and given that, again, it's DISCONTINUED, I don't see that getting any better...actually, come to think of it, my JVC/Victor SU-DH1 also has DTS decoding and room mode selection, and of course, it's discontinued too. I suspect common components in both of them being discontinued parts in favor of the cut-down versions used on the DSS and Mixamp.
A bit more research reveals that the transmitter module itself is designated the TRE-D800. Good luck finding a standalone unit for sale, though...I'd certainly like to get my hands on one just to pit it against the SU-DH1.
Edited by NamelessPFG - 1/5/14 at 7:32am