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About product and suppliers:
        Alibaba.com offers 3,170 sound 7.1 products. About 34% of these are earphone & headphone, 14% are car video, and 8% are home theatre system. 

A wide variety of sound 7.1 options are available to you, such as computer, portable media player. You can also choose from microphone, noise cancelling. As well as from usb, 3.5mm. And whether sound 7.1 is 802.11n 2.4ghz, 802.11n 2.4g/5ghz, or 802.11ac. 

There are 3,173 sound 7.1 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Italy, which supply 98%, 1%, and 1% of sound 7.1 respectively. 

Sound 7.1 products are most popular in North America, Western Europe, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 245 with BSCI, 236 with ISO9001, and 122 with Other certification.