Marantz SR6011 vs Onkyo TX-RZ840 comparison definitely makes sense.
Considered AV receivers have the same number of channels 9.2. Regarding power, then SR6011 has such a W/Ohm ratio - 110/8 20Hz-20KHz, 150/6 1KHz when TX-RZ840 has a power of 180/6 1KHz. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for SR6011 and AKM 384 KHz/32-bit for the TX-RZ840. Both the SR6011 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 Marantz SR6011 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The SR6011 can work with the audio stream from Pandora, Sirius XM, and the TX-RZ840 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio. Compared AV receivers retain the quality of 4K 60p 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 SR6011 can scale the input HDMI signal, unlike the TX-RZ840. Dolby Vision technology found support only on the TX-RZ840.
The Marantz SR6011 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.
The SR6011 supports 2 Multi-room zones, versus 3 for the TX-RZ840. An ECO mode is only available for the SR6011. Both SR6011 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.
The Onkyo TX-RZ840 is better receiver in this comparison. Check Onkyo TX-RZ840 price