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Hi Addict, Thank you for your inquiry. Sony A90J is the successor series of A9G, and A80J is the successor of A8H. When it comes to the picture quality and enhanced features, the A80J is a more advanced TV compare to the A9G. The A80J is powered by the revolutionary Cognitive Processor XR while the A9G comes with X1 Ultimate. Cognitive Processor XR is able to deliver more realistic picture optimization as it cross-analyzes data, enhancing pictures in the same way that the human eye focuses on real-life color and depth. This TV has a unique ambient optimization technology with light and color sensors automatically adjusts picture and sound to your environment. The speaker system that is integrated with A90J and A9G are basically similar. They both came with Acoustic Surface Audio+ that is powered by 20W + 20W + 10W + 10W, while the A80J also features Acoustic Surface Audio+ that is powered by 10W + 10W + 10W for 55" and 65" class, and 20W + 20W + 10W on 77" class. Acoustic Surface Audio+ that is powered by 20W + 20W + 10W is quite a good speaker system that can delivers good surround sound for your favorite entertainment. Regards, Jess
Sorry, there was a problem. Please try again later.Technical a80j vs. a90j https://www.rtings.com/tv/tools/compare/sony-a80j-oled-vs-sony-a90j-oled/21563/21565 a80j vs. a9g https://www.rtings.com/tv/tools/compare/sony-a9g-oled-vs-sony-a80j-oled/833/21563
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