An affordable AV receiver is always a good option to consider, so Onkyo TX-RZ620 vs Yamaha RX-V475 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-RZ620 has 7.2 versus 5.1 for Yamaha RX-V475. Regarding power, then TX-RZ620 has such a W/Ohm ratio - 100/8 when RX-V475 has a power of 80/6. The THD is 0.08% for the TX-RZ620 but 0.09% for the RX-V475.
Characteristics of digital to analog converter (DAC) are different, 384 KHz/32-bit for TX-RZ620 and Burr-Brown 192 KHz/24-bit for the RX-V475. Only the TX-RZ620 supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay. Spotify can be used on each receiver. Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. Both competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the TX-RZ620.
The Onkyo TX-RZ620 has 7/2 HDMI inputs/outputs versus 5/1 HDMI connectors of the Yamaha RX-V475. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The TX-RZ620 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is only available for the RX-V475. The setup assistant will help you configure Onkyo TX-RZ620.
Only the TX-RZ620 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-RZ620.