I just purchased a 830 and will be at BB Friday, can't wait. Here's what I saw when I compared the 2 on Yamaha's site... 830 7.2, 2020 older model and 9.2, 2020 has 35 more wpc. Also the 2020 has 6 additional DSP programs and a high resolution music enhancer for older recordings. If you need 9.2 then the 2020 was your choice. Other than above stated per Yamaha's website, the other features look close or same.
9/25/13 at 5:46pm