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.) DTS:X For each speaker, DTS:X allows the "location" (direction from the listener) of "objects" (audio tracks) to be specified as polar coordinates. The audio processor is then responsible for dynamically rendering sound output depending on the number and position of speakers available. Dolby Atmos uses a similar technique, although the speaker layout employed by cinema DTS:X is the sum of Dolby Atmos and Auro-3D. The layout showcased at AMC Burbank theatre number 8 has a standard eight channel base layer, a five channel height layer on top of the base layer (on the front and side walls) and three rows of speakers on the ceiling. The surround arrays are bass managed by woofers suspended from the ceiling. A first public demonstration was performed at CES 2015 on a Trinnov Altitude32 processor. DTS Neo:6 DTS Neo:6, like Dolby's Pro Logic IIx system, reconstructs 2.1, 5.1, 6.1, or 7.1 sources to 3.1, 4.1, 5.1, 6.1, and 7.1 channel systems. A 7.1 system's 2 rear speakers are mono. Neo:6 is a multi-band decoder, unlike Dolby Pro Logic II's broadband logic steering, meaning that the decoder can enhance more than one predominant signal at a time — provided each predominant signal lies in a different frequency band than the others. The number of bands steered varies in each Neo:6 implementation, with the first decoders steering in 12 separate bands and later units steering up to 19. DTS Neo:X DTS Neo:X reconstructs 2.1, 5.1, 6.1, or 7.1 sources to 11.1 front height and width channel systems. Dolby's Pro Logic IIz's system adds only front height channels to the 7.1 configuration. Neo:X also matrix downmixes 11.1 sources to 5.1 or 7.1 channel systems. DTS Neural:X DTS Neural:X, like Dolby Surround, is an upmixing technique to serve legacy bitstreams and PCM content by upmixing or remapping them to virtually any speaker layout (in which the sound can come from anywhere around the listener, including above). It is complementary to the DTS:X system, allowing the full use of a DTS:X speaker layout when the content has not been encoded for it. DTS Virtual:X DTS Virtual:X creates "phantom" surround and/or height speakers using