Because is harder and cost more $ to make it 7.1 Actually many new asian release blu-ray is support 7.1, some even goes for 7.1 pcm, 7.1 dts master, 7.1 dolby ! U.S. is behind in 7.1 market, right now only 5% blu-ray are 7.1 but i think lion gate and disney is plan to increase their title to more 7.1
“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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Because is harder and cost more $ to make it 7.1 Actually many new asian release blu-ray is support 7.1, some even goes for 7.1 pcm, 7.1 dts master, 7.1 dolby ! U.S. is behind in 7.1 market, right now only 5% blu-ray are 7.1 but i think lion gate and disney is plan to increase their title to more 7.1