The Onkyo TX-SR383 vs Marantz SR5013 comparison proves that these receivers have many common features.
Considered AV receivers have the same number of channels 7.2. Regarding power, then TX-SR383 has such a W/Ohm ratio - 100/8, 135/6 when SR5013 has a power of 100/8, 140/6. The THD is 0.09% for the TX-SR383 but 0.08% for the SR5013.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for TX-SR383 and AKM 384 KHz/32-bit for the SR5013. Only the SR5013 supports Bi-amping feature. The Marantz SR5013 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the SR5013 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 SR5013 can scale the input HDMI signal, unlike the TX-SR383. Dolby Vision technology found support only on the SR5013.
The Onkyo TX-SR383 has 4/1 HDMI inputs/outputs versus 8/2 HDMI connectors of the Marantz SR5013. 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. The SR5013 has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. An ECO mode is only available for the SR5013. The setup assistant will help you configure Marantz SR5013.
Only the SR5013 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR5013.