It makes sense comparing Yamaha RX-V671 vs Yamaha RX-V485 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 5.1 for Yamaha RX-V485. Regarding power, then RX-V671 has such a W/Ohm ratio - 90/8, 150/4 when RX-V485 has a power of 80/8, 145/6. The THD is the same and is 0.09%.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V671 and Burr-Brown 384 KHz/32-bit for the RX-V485. Both the RX-V671 and the RX-V485 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Only the Yamaha RX-V485 can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the RX-V485 supports Spotify. The RX-V671 can work with the audio stream from Napster, and the RX-V485 can receive a content from Deezer, TIDAL, Pandora, Napster, SiriusXM. 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 RX-V485.
The Yamaha RX-V671 has 6/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Yamaha RX-V485. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the RX-V485. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The RX-V671 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the RX-V485. The RX-V671 has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. An ECO mode is only available for the RX-V485. The setup assistant will help you configure Yamaha RX-V485.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.