It makes sense comparing Yamaha RX-V671 vs Sony STRZA5000ES because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-V671 has 7.1 versus 9.2 for Sony STRZA5000ES. Regarding power, then RX-V671 has such a W/Ohm ratio - 90/8, 150/4 when STRZA5000ES has a power of 130/8. The THD is the same and is 0.09%. Both the RX-V671 and the STRZA5000ES support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models do not have WI-FI support. Only the RX-V671 has Bluetooth support. Each of these units does not support Apple Music. Competitors do not have built-in Spotify service. 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 rivals can scale the resolution of the incoming HDMI signal. Dolby Vision technology found support only on the STRZA5000ES.
The Yamaha RX-V671 has 6/1 HDMI inputs/outputs versus 6/2 HDMI connectors of the Sony STRZA5000ES. 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 RX-V671 has a built-in phono stage for connecting a vinyl player.
The RX-V671 supports 2 Multi-room zones, versus 3 for the STRZA5000ES. A voice control is not available. An ECO mode is not present in each of the AV receivers. The setup assistant will help you configure Sony STRZA5000ES.
Only the STRZA5000ES has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the STRZA5000ES.