It makes sense comparing Yamaha RX-V479BL vs Yamaha RX-V683BL because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-V479BL has 5.1 versus 7.2 for Yamaha RX-V683BL. Regarding power, then RX-V479BL has such a W/Ohm ratio - 80/8 when RX-V683BL has a power of 90/8, 150/4. The THD is 0.09% for the RX-V479BL but 0.06% for the RX-V683BL.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for RX-V479BL and Burr-Brown 192 KHz/24-bit for the RX-V683BL. Only the RX-V683BL 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 have the ability to connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay. Only the RX-V683BL supports Spotify. 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-V683BL can scale the input HDMI signal, unlike the RX-V479BL. Dolby Vision technology found support only on the RX-V683BL.
Each receiver has 6/1 HDMI inputs/outputs. 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-V683BL has a built-in phono stage for connecting a vinyl player. A voice control is not available. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-V479BL and RX-V683BL can be configured using the Setup assistant.
Only the RX-V683BL has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-V683BL.