An affordable AV receiver is always a good option to consider, so Onkyo TX-SR383 vs Sony STR DH550 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 Sony STR DH550. Regarding power, then TX-SR383 has such a W/Ohm ratio - 100/8, 135/6 when STR DH550 has a power of 90/6. The THD is the same and is 0.09%.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/24-bit. 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. Only the TX-SR383 has Bluetooth support. Each of these units does not support Apple Music. Competitors do not have built-in Spotify service.
Only the Onkyo TX-SR383 has support for High dynamic range (HDR). Only the TX-SR383 provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. The HDR standard - Dolby Vision is not supported by these receivers.
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 not present in each of the AV receivers. Unfortunately, the setup assistant is not available in each of the models.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.