It makes sense comparing Onkyo TX-RZ920 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, Onkyo TX-RZ920 has 9.2 versus 7.2 for Onkyo TX-RZ710. Regarding power, then TX-RZ920 has such a W/Ohm ratio - 135/8, 175/6 when TX-RZ710 has a power of 175/6. The THD is 0.04% for the TX-RZ920 but 0.08% for the TX-RZ710.
Characteristics of digital to analog converter (DAC) are different, AK4490 384 KHz/32-bit for TX-RZ920 and AK4458 384 KHz/32-bit for the TX-RZ710. Both the TX-RZ920 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 Onkyo TX-RZ920 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The TX-RZ920 can work with the audio stream from Deezer, TIDAL, Pandora, TuneIn Radio, and the TX-RZ710 can receive a content from Deezer, TIDAL, Pandora, Tunein Radio. 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. Both rivals can scale the resolution of the incoming HDMI signal. Dolby Vision technology found support only on the TX-RZ920.
Each receiver has 8/2 HDMI inputs/outputs. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the TX-RZ920. 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 TX-RZ920 supports 3 Multi-room zones, versus 2 for the TX-RZ710. An ECO mode is only available for the TX-RZ710. The setup assistant will help you configure Onkyo TX-RZ920.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.