The Onkyo TX-RZ920 vs Denon AVR-X4100W comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Onkyo TX-RZ920 has 9.2 versus 7.2 for Denon AVR-X4100W. Regarding power, then TX-RZ920 has such a W/Ohm ratio - 135/8, 175/6 when AVR-X4100W has a power of 125/8, 165/6. The THD is 0.04% for the TX-RZ920 but 0.05% for the AVR-X4100W.
Characteristics of digital to analog converter (DAC) are different, AK4490 384 KHz/32-bit for TX-RZ920 and 192 KHz/24-bit for the AVR-X4100W. Both the TX-RZ920 and the AVR-X4100W support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. 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 AVR-X4100W can receive a content from Pandora, SiriusXM. 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. The HDR standard - Dolby Vision is supported by these receivers.
The Onkyo TX-RZ920 has 8/2 HDMI inputs/outputs versus 8/3 HDMI connectors of the Denon AVR-X4100W. 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. These compared receivers have a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 3 Multi-room zones. An ECO mode is only available for the AVR-X4100W. Both TX-RZ920 and AVR-X4100W can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. A surround technology DTS:X is supported only by the TX-RZ920.