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'''DTS-HD Master Audio''', previously known as ''DTS++'',<ref>{{cite web|url=http://news.ecoustics.com/bbs/messages/10381/107453.html|title=DTD Unveils DTS-HD Brand For High Definition Media Formats - ecoustics.com|date=1 November 2004}}</ref> is the second of two DTS-HD audio formats.<ref>{{cite web|url=http://www.dts.com/~/media/D84CFDAD4E534E32920F80A5A3B7D4CC.ashx|title=Box|website=www.dts.com}}</ref> It supports a virtually unlimited number of surround sound channels, can deliver audio quality at bit rates extending from lossless (24-bit, 192 kHz) down to DTS Digital Surround and, like Neo, [[downmixing|downmix]] to 5.1 or 2.1 systems.
DTS-HD Master Audio is selected as an optional surround sound format for [[Blu-ray Disc|Blu-ray]], where it has been limited to a maximum of 8 discrete channels. DTS-HD MA supports variable bit rates up to 24.5 Mbit/s, with up to [[5.1 surround sound
All Blu-ray players can decode the DTS "core" resolution soundtrack at 1.5 Mbit/s, however, as DTS-HD Master Audio is also implemented as a standard DTS core plus extensions, but cannot decode audio from DTS audio CDs. DTS-HD Master Audio and [[Dolby TrueHD]] are the only technologies that deliver compressed [[lossless]] surround sound for these new disc formats, ensuring the highest quality audio performance available in the new standards. (DTS Coherent Acoustics' coding system was selected as mandatory audio technology for Blu-ray Discs.)<ref>{{cite web|url=http://www.dts.com/company/press/press-article.php?ID=132784259&yID=2004&cID=1|title=''DTS technology mandatory for next generation discs'' - dts.com|access-date=2008-06-02|archive-url=https://web.archive.org/web/20060324224057/http://www.dts.com/company/press/press-article.php?ID=132784259&yID=2004&cID=1|archive-date=2006-03-24|url-status=dead}}</ref>
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