An affordable AV receiver is always a good option to consider, so Onkyo TX-SR383 vs Onkyo TX-SR393 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR383 has 7.2 versus 5.2 for Onkyo TX-SR393. Regarding power, then TX-SR383 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 TX-SR383 but 0.08% for the TX-SR393.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for TX-SR383 and AKM 384 KHz/32-bit for the TX-SR393. None of the models support Bi-amping. Sound transmission directly to the amplifier in Pure direct (straight) mode is not implemented in these models.
Both models do not have WI-FI support. Rivals from our review have 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 TX-SR383. 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.
Each of the AV receivers from our review supports 2 Multi-room zones. A voice control is not available. An ECO mode is not present in each of the AV receivers. 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.