It makes sense comparing Yamaha RX-V4A vs Onkyo TX-8020 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-V4A has 5.2 versus 2.0 for Onkyo TX-8020. Regarding power, then RX-V4A has such a W/Ohm ratio - 80/6 when TX-8020 has a power of 90/6. The THD is 0.06% for the RX-V4A but 0.03% for the TX-8020. Only the RX-V4A supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Only the RX-V4A has Bluetooth support. The Yamaha RX-V4A has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Only the RX-V4A supports Spotify. Only the RX-V4A provides HDMI signal transmission in standby mode. The RX-V4A can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the RX-V4A. Only the RX-V4A supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the RX-V4A. Of the two receivers in our comparison, HDMI CEC is present in only the RX-V4A. The TX-8020 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the RX-V4A. The setup assistant will help you configure Yamaha RX-V4A.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.