It makes sense comparing Yamaha RX-V377 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-V377 has 5.1 versus 7.2 for Yamaha RX-V683BL. Regarding power, then RX-V377 has such a W/Ohm ratio - 100/8, 135/6 when RX-V683BL has a power of 90/8, 150/4. The THD is 0.09% for the RX-V377 but 0.06% for the RX-V683BL.
Competitors' digital to analog converter (DAC) is identical to Burr-Brown 192 KHz/24-bit. 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.
Only the Yamaha RX-V683BL can connect to the Internet via WI-FI. Only the RX-V683BL has Bluetooth support. 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-V377. Dolby Vision technology found support only on the RX-V683BL.
The Yamaha RX-V377 has 4/1 HDMI inputs/outputs versus 6/1 HDMI connectors of the Yamaha RX-V683BL. 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-V377 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.