An affordable AV receiver is always a good option to consider, so Yamaha RX-V675 vs Onkyo TX-SR393 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V675 has 7.2 versus 5.2 for Onkyo TX-SR393. Regarding power, then RX-V675 has such a W/Ohm ratio - 90/8, 150/4 when TX-SR393 has a power of 80/8, 155/6. The THD is 0.09% for the RX-V675 but 0.08% for the TX-SR393.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V675 and AKM 384 KHz/32-bit for the TX-SR393. Only the RX-V675 supports Bi-amping feature. The Yamaha RX-V675 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-V675 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. Both rivals can scale the resolution of the incoming HDMI signal. The HDR standard - Dolby Vision is supported by these receivers.
The Yamaha RX-V675 has 6/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Onkyo TX-SR393. 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.
Each of the AV receivers from our review supports 2 Multi-room zones. A voice control is not available. An ECO mode is only available for the RX-V675. 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.