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Basically updated internals. They updated the memory, processor, and wireless. It is supposed to have less vibration as well. I just got this along with the arc and it is amazing. I love playing things and turning off and on the sub to hear and feel the difference it makes, I can't compare as I didn't have the Gen1. Also this link (https://thedigitaltheater.com/dolby-trailers/) has demos you can use to test out audio systems with the different dolby technologies. Not a detailed answer, but I hope that helps. If anything you can search the webs on your question and probably get more detailed analysis of the two.
Sorry, there was a problem. Please try again later.More high and low quailty and better wireless connecton.also works well with the new app and has a change for the front button
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