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Thats because dts was converted to dolby before processing and then to DH. The Marantz receivers did the same. Dolby headphone is just that, a dolby encoder for headphones. This is why devices like the Mixamp and DSS will never do proper surround unless its a DD signal. In the case of the PS3 bitstream mix option, I assume the PS3 internally changes DTS to Dolby Digital, or there is a hidden Dolby container in the audio file that you cant access other than through special situations. That is why blu-rays encoded in DTS can go to Dolby Headphone... ONLY in Bitstream mix, and not Bitstream direct, while the rare Dolby enabked blu-ray can do DH regardless of bitstream setting (I.e. G.I. Joe Retaliation). In the case if the JVC Su-Dh1, they sound identical probably because DTS was converted to Dolby format. That is why there is no sq difference.
It makes sense for Dolby to have some form of method to convert DTS into DD, because if DTS directly into Dolby Headphone was possible, there wouldn't be any reason why things like the Mixamp couldn't do it.
Unless the encoder gets a DD signal, youre just gonna get upmixed stereo or nothing at all.
What needs to be done is that all devices should have whatever hardware is allowing it to convert DTS into a file that Dolby Headphone can read.
It makes sense for Dolby to have some form of method to convert DTS into DD, because if DTS directly into Dolby Headphone was possible, there wouldn't be any reason why things like the Mixamp couldn't do it.
Unless the encoder gets a DD signal, youre just gonna get upmixed stereo or nothing at all.
What needs to be done is that all devices should have whatever hardware is allowing it to convert DTS into a file that Dolby Headphone can read.