It’s strongly recommended to compare different receivers if you want to choose the best one: Onkyo TX-RZ920 vs Yamaha RX-V481BL.
The number of channels for receivers is different - 9.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the TX-RZ920 has such a ratio W/Ohm - 135/8, 175/6, while the RX-V481BL has a power of 80/6. The value of total harmonic distortion is also different, and for the TX-RZ920 it is 0.04%, but for the RX-V481BL it is 0.09%.
The manufacturer installed different DACs, the TX-RZ920 received the model AK4490 384 KHz/32-bit, but the RX-V481BL is equipped with Burr-Brown 192 KHz/24-bit. Each of the compared opponents supports Bi-amping. Both Onkyo TX-RZ920 and Yamaha RX-V481BL can transmit an audio signal directly to the amplifier and bypasses any DSP processing. 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-RZ920 works with Deezer, TIDAL, Pandora, TuneIn Radio, but the Yamaha RX-V481BL works with Pandora, Qobuz, JUKE. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the TX-RZ920 and the RX-V481BL. Video scaling is only possible with the TX-RZ920. Operation with the Dolby Vision is only possible with the TX-RZ920.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-RZ920 has 8/2, and the RX-V481BL has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the TX-RZ920. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-RZ920 and RX-V481BL support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-RZ920. There is an ECO mode in RX-V481BL. The Onkyo TX-RZ920 and the Yamaha RX-V481BL can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-RZ920. Only in the TX-RZ920 realized a DTS:X surround technology.