An affordable AV receiver is always a good option to consider, so Yamaha RX-V377 vs Yamaha RX-V585BL comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V377 has 5.1 versus 7.2 for Yamaha RX-V585BL. Regarding power, then RX-V377 has such a W/Ohm ratio - 100/8, 135/6 when RX-V585BL 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-V377 and Burr-Brown 384 KHz/32-bit for the RX-V585BL. Only the RX-V585BL 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 RX-V585BL has Bluetooth support. Only the RX-V585BL 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-V585BL can scale the input HDMI signal, unlike the RX-V377. Dolby Vision technology found support only on the RX-V585BL.
Each receiver has 4/1 HDMI inputs/outputs. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the RX-V585BL. 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. Receivers do not have a built-in phono stage for connecting a vinyl player. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-V377 and RX-V585BL can be configured using the Setup assistant.
Only the RX-V585BL has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-V585BL.