An affordable AV receiver is always a good option to consider, so Marantz SR7011 vs Onkyo TX-NR555 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Marantz SR7011 has 9.2 versus 7.2 for Onkyo TX-NR555. Regarding power, then SR7011 has such a W/Ohm ratio - 125/8, 165/6 when TX-NR555 has a power of 130/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/32-bit for SR7011 and Hi-Grade 384 KHz/32-bit for the TX-NR555. Both the SR7011 and the TX-NR555 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. Rivals from our review have Bluetooth support. The Marantz SR7011 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The SR7011 can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, and the TX-NR555 can receive a content from Deezer, TIDAL, Pandora.
These units support HDR technology. 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 SR7011 can scale the input HDMI signal, unlike the TX-NR555. Dolby Vision technology found support only on the SR7011.
The Marantz SR7011 has 8/3 HDMI inputs/outputs versus 6/1 HDMI connectors of the Onkyo TX-NR555. 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. These compared receivers have a built-in phono stage for connecting a vinyl player.
The SR7011 supports 3 Multi-room zones, versus 2 for the TX-NR555. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Marantz SR7011.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.