ATi graphics card could only do LPCM audio output but no direct bitstream to AVR for decoding. Moreover, most software Blu-ray players such as PowerDVD, WinDVD, will downsample the LPCM to below 16bit/48KHz audio quality (usually as MP3 bitrate) on general audio/HDMI devices unless it supports AACS compliant protected audio playback as Xonar HDAV did with Arcsoft TMT player. So, you could not get the real uncompromising HD audio inside the Blu-ray disc.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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you can do audio with the ati card pop to their site its a pain to set up but you can send the audio via the hdmi on the card
ATi graphics card could only do LPCM audio output but no direct bitstream to AVR for decoding. Moreover, most software Blu-ray players such as PowerDVD, WinDVD, will downsample the LPCM to below 16bit/48KHz audio quality (usually as MP3 bitrate) on general audio/HDMI devices unless it supports AACS compliant protected audio playback as Xonar HDAV did with Arcsoft TMT player. So, you could not get the real uncompromising HD audio inside the Blu-ray disc.