Having had an opportunity to test Onkyo TX-RZ840 vs Yamaha R-N602BL, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 9.2 versus 2.0, respectively, for devices. In terms of power, there are differences, the TX-RZ840 has such a ratio W/Ohm - 180/6, while the R-N602BL has a power of 115/8, 105/4. The value of total harmonic distortion is also different, and for the TX-RZ840 it is 0.08%, but for the R-N602BL it is 0.01%.
The manufacturer installed different DACs, the TX-RZ840 received the model AKM 384 KHz/32-bit, but the R-N602BL is equipped with Burr-Brown 192 KHz/24-bit. The Bi-amping function is implemented only in the Onkyo TX-RZ840. Both Onkyo TX-RZ840 and Yamaha R-N602BL can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet access via WIFI is possible on both units. Each of the receivers has a Bluetooth connector. The contenders have differences in the supported services from Apple - AirPlay, AirPlay 2 versus AirPlay respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Onkyo TX-RZ840 works with Deezer, TIDAL, Pandora, TuneIn Radio, but the Yamaha R-N602BL works with Deezer, TIDAL, Pandora, Napster, SiriusXM, Qobuz. HDMI signal transmission in standby mode can provide only the TX-RZ840. None of the devices can increase the resolution of the incoming video signal. Operation with the Dolby Vision is only possible with the TX-RZ840. HDMI Audio Return Channel is only available on Onkyo TX-RZ840. HDMI eARC is only supported by the TX-RZ840. When comparing receivers, it becomes clear that only the Onkyo TX-RZ840 has HDMI CEC. Like most receivers, our models have a built-in phono stage for connecting a vinyl player. There is an ECO mode in R-N602BL. The Onkyo TX-RZ840 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-RZ840. Only in the TX-RZ840 realized a DTS:X surround technology.