The 9.2-channel Onkyo TX-RZ830 based on the powerful amplifier which produces 180W per channel. The AV receiver makes it possible to build a 5.2.4 or 7.2.2-channel configuration for working with Dolby Atmos and DTS: X formats. Onkyo TX-RZ830 vs Onkyo TX-RZ820 has enough functionality to create the Third zone. AccuEQ Advance deals with the speaker calibration, eliminating standing waves in the listening area. There is support for the online services Spotify, Deezer and Amazon Music. Hi-Res formats are played on the local network and via USB.
TX-RZ820 is the THX® Certified 7.2-channel receiver. In comparison Marantz TX-RZ820 versus TX-RZ830, RZ820 has a less powerful amplifier - 130W. The proprietary dynamic audio amplification system provides instantaneous power with high currents to build large speakers with better control and faster response over a wide frequency range from 5 Hz to 100 kHz, which ensures a more energetic and realistic sound. The TX-RZ820 supports Dolby Atmos and DTS: X decoding, as well as video transmission from Dolby Vision and HDR10.
The Onkyo TX-RZ830 is better receiver in this comparison. Check Onkyo TX-RZ830 price