An affordable AV receiver is always a good option to consider, so Yamaha RX-V377 vs Onkyo TX-SR393 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V377 has 5.1 versus 5.2 for Onkyo TX-SR393. Regarding power, then RX-V377 has such a W/Ohm ratio - 100/8, 135/6 when TX-SR393 has a power of 80/8, 155/6. The THD is 0.09% for the RX-V377 but 0.08% for the TX-SR393.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V377 and AKM 384 KHz/32-bit for the TX-SR393. None of the models support Bi-amping. The Yamaha RX-V377 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models do not have WI-FI support. Only the TX-SR393 has Bluetooth support. Each of these units does not support Apple Music. Competitors do not have built-in Spotify service. 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 TX-SR393 can scale the input HDMI signal, unlike the RX-V377. Dolby Vision technology found support only on the TX-SR393.
Each receiver has 4/1 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. Receivers do not have 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-V377. The setup assistant will help you configure Yamaha RX-V377.
Only the TX-SR393 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-SR393.