An affordable AV receiver is always a good option to consider, so Onkyo TX-SR393 vs Yamaha RX-V475 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR393 has 5.2 versus 5.1 for Yamaha RX-V475. Regarding power, then TX-SR393 has such a W/Ohm ratio - 80/8, 155/6 when RX-V475 has a power of 80/6. The THD is 0.08% for the TX-SR393 but 0.09% for the RX-V475.
Characteristics of digital to analog converter (DAC) are different, AKM 384 KHz/32-bit for TX-SR393 and Burr-Brown 192 KHz/24-bit for the RX-V475. None of the models support Bi-amping. The Yamaha RX-V475 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models do not have WI-FI support. Rivals from our review have Bluetooth support. Only the RX-V475 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 TX-SR393 can scale the input HDMI signal, unlike the RX-V475. Dolby Vision technology found support only on the TX-SR393.
The Onkyo TX-SR393 has 4/1 HDMI inputs/outputs versus 5/1 HDMI connectors of the Yamaha RX-V475. 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-V475. Unfortunately, the setup assistant is not available in each of the models.
Only the TX-SR393 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-SR393.