Pioneer SC-LX801 vs Onkyo TX-RZ840 comparison definitely makes sense.
Considered AV receivers have the same number of channels 9.2. Regarding power, then SC-LX801 has such a W/Ohm ratio - 140/8, 200/6, 255/4 when TX-RZ840 has a power of 180/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, ESS SABRE32 Ultra 192 KHz/32-bit for SC-LX801 and AKM 384 KHz/32-bit for the TX-RZ840. Both the SC-LX801 and the TX-RZ840 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 Pioneer SC-LX801 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The SC-LX801 can work with the audio stream from Deezer, TIDAL, Pandora, and the TX-RZ840 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio.
Both AV receivers support HDR10 technology (High dynamic range). 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 SC-LX801 can scale the input HDMI signal, unlike the TX-RZ840. The HDR standard - Dolby Vision is supported by these receivers.
The Pioneer SC-LX801 has 8/2 HDMI inputs/outputs versus 7/2 HDMI connectors of the Onkyo TX-RZ840. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the TX-RZ840. 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.
Each of the AV receivers from our review supports 3 Multi-room zones. An ECO mode is not present in each of the AV receivers. Both SC-LX801 and TX-RZ840 can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.