Hi Clondalkin,
This is according to iboum.com (last update, Dec. 14, 2009)
http://www.iboum.com/artkill/hd-audio-media-players.php:
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Dolby TrueHD Media PlayersPass-through: **WDTV Live, **WDTV (mk2), **Netgear Elite 9150, **QNAP NMP-1000, **SageTV HD, DViCO Tvix 7000, Egreat EG-M34A, Popcorn Hour A-110, DViCO Tvix 6500, HDX 1000, Elektron EHP-700, I-Box Z400W
Downmix: **WDTV Live, **WDTV (mk2), **Netgear Elite 9150, **QNAP NMP-1000, **SageTV HD, Popcorn Hour C-200, Xtreamer, ACRyan PlayOn, Mede8er MED500X
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DTS Media PlayersPass-through: ACRyan PlayOn, Astone AP-100, ASUS O!Play HDP-R1, ASUS O!Play HDP-R3, Brite-View CinemaTube, Dune HD Base 3.0, DViCO Tvix 6500, DViCO Tvix 6600, DViCO Tvix 7000, Egreat EG-M34A, Egreat EG-R1, Elektron EHP-700, Ellion HMP-500, Ellion Labo, Eminent EM7075, Emtec N200, Fantech MM-FHDL, HDX 1000, Hisense MP800H, I-Box Z400W, IcyBox IB-MP305, Mede8er MED500X, MediaGate M2TV, MediaNow MNP-101, Myka 250, Netgear DE Elite, Patriot Box Office, Popcorn Hour A-110, Popcorn Hour C-200, Poppstar MS30, Prodigi PD-100N, SageTV HD Theatre , Sumvision Cyclone, WDTV (mk1), WDTV (mk2), WDTV Live, Xtreamer
Downmix: ACRyan PlayOn, ASUS O!Play HDP-R1, ASUS O!Play HDP-R3, Brite-View CinemaTube, DViCO Tvix 6500, DViCO Tvix 6600, DViCO Tvix 7000, Egreat EG-M34A, Egreat EG-R1, Elektron EHP-700, Ellion HMP-500, Ellion Labo, Fantech MM-FHDL, Hisense MP800H, I-Box Z400W, IcyBox IB-MP305, Mede8er MED500X, MediaGate M2TV, Mvix Ultio, Patriot Box Office, Popcorn Hour A-110, Popcorn Hour C-200, QNAP NMP-1000, Seagate Theatre+, Sumvision Cyclone, WDTV (mk2), WDTV Live, Xtreamer
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DTS-HD MA Media PlayersPass-through: Netgear Elite 9150, Elektron EHP-700, I-Box Z400W, SageTV HD, HDX 1000, DViCO Tvix 6500, DViCO Tvix 7000, Popcorn Hour A-110, Egreat EG-M34A
Downmix: WDTV (mk2), WDTV Live, Egreat EG-R1, Popcorn Hour C-200, Xtreamer, ACRyan PlayOn, QNAP NMP-1000,
Note: Players with
** can downmix AND pass through the respective format.