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Which shopping mall in Zhengzhou sells DD DTS decoders (standard household dual decoders)

Go to the home appliance market next to Dong Building Materials and try to find it. It is unlikely that you will find it, but it will never be available in other markets.

There are many people selling this online. You can buy it for 2 or 300 yuan. How can it be second-hand? A friend of mine bought it online.

But then again, basically they only use a 'crystal' chip.

In addition, the brands you mentioned, haha, personally think that they are just furniture that can make sounds.

As for certification, don’t even think about it. As far as I know, this type of decoders are purchased from overseas obsolete chips and assembled by small factories in Shenzhen. However, this chip is indeed good in the 5.1 era.