An affordable AV receiver is always a good option to consider, so Yamaha RX-V671 vs Yamaha RX-V475 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V671 has 7.1 versus 5.1 for Yamaha RX-V475. Regarding power, then RX-V671 has such a W/Ohm ratio - 90/8, 150/4 when RX-V475 has a power of 80/6. The THD is the same and is 0.09%.
Competitors' digital to analog converter (DAC) is identical to Burr-Brown 192 KHz/24-bit. Only the RX-V671 supports Bi-amping feature. 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. Rivals from our review have Bluetooth support. Only the RX-V475 supports Spotify.
HDR is not available on each model. 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. The RX-V671 can scale the input HDMI signal, unlike the RX-V475. The HDR standard - Dolby Vision is not supported by these receivers.
The Yamaha RX-V671 has 6/1 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 RX-V671 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. Unfortunately, the setup assistant is not available in each of the models.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.