The Onkyo TX-NR555 vs Yamaha RX-V383BL comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Onkyo TX-NR555 has 7.2 versus 5.1 for Yamaha RX-V383BL. Regarding power, then TX-NR555 has such a W/Ohm ratio - 130/6 when RX-V383BL has a power of 70/6. The THD is 0.08% for the TX-NR555 but 0.09% for the RX-V383BL.
Characteristics of digital to analog converter (DAC) are different, Hi-Grade 384 KHz/32-bit for TX-NR555 and Burr-Brown 192 KHz/24-bit for the RX-V383BL. Only the TX-NR555 supports Bi-amping feature. The Onkyo TX-NR555 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the TX-NR555 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 RX-V383BL can scale the input HDMI signal, unlike the TX-NR555. Dolby Vision technology found support only on the RX-V383BL.
The Onkyo TX-NR555 has 6/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Yamaha RX-V383BL. 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 TX-NR555 has a built-in phono stage for connecting a vinyl player. A voice control is not available. It is also worth noting that the ECO mode is presented in each of the receivers. Unfortunately, the setup assistant is not available in each of the models.
Only the TX-NR555 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-NR555.