It makes sense comparing Marantz SR7015 vs Onkyo TX-RZ710 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Marantz SR7015 has 9.2 versus 7.2 for Onkyo TX-RZ710. Regarding power, then SR7015 has such a W/Ohm ratio - 125/8, 165/6 when TX-RZ710 has a power of 175/6. The THD is 0.05% for the SR7015 but 0.08% for the TX-RZ710. Both the SR7015 and the TX-RZ710 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 SR7015 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The SR7015 can work with the audio stream from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud, and the TX-RZ710 can receive a content from Deezer, TIDAL, Pandora, Tunein Radio. HDMI signal transmission in standby mode is implemented in each of the devices. Both rivals can scale the resolution of the incoming HDMI signal. Dolby Vision technology found support only on the SR7015.
The Marantz SR7015 has 8/3 HDMI inputs/outputs versus 8/2 HDMI connectors of the Onkyo TX-RZ710. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the SR7015. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The SR7015 supports the protection of digital content of the standard HDCP 2.3, versus HDCP 2.2 in the TX-RZ710. These compared receivers have a built-in phono stage for connecting a vinyl player.
The SR7015 supports 3 Multi-room zones, versus 2 for the TX-RZ710. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Marantz SR7015.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.