It makes sense comparing Denon AVR-X8500H vs Marantz SR6014 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Denon AVR-X8500H has 13.2 versus 9.2 for Marantz SR6014. Regarding power, then AVR-X8500H has such a W/Ohm ratio - 150/8, 250/6 when SR6014 has a power of 110/8, 185/6. The THD is 0.05% for the AVR-X8500H but 0.08% for the SR6014.
Characteristics of digital to analog converter (DAC) are different, AK4490EQ 768 KHz/32-bit for AVR-X8500H and AK4458 384 KHz/32-bit for the SR6014. Both the AVR-X8500H and the SR6014 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 Apple Music service is implemented on considered devices: AirPlay, AirPlay 2. Spotify can be used on each receiver. The AVR-X8500H can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, and the SR6014 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio, iHeart 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. The HDR standard - Dolby Vision is supported by these receivers.
Each receiver has 8/3 HDMI inputs/outputs. The HDMI Audio Return Channel (ARC) feature supports both devices. HDMI eARC is available in each model. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The AVR-X8500H supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the SR6014. These compared receivers have a built-in phono stage for connecting a vinyl player.
The AVR-X8500H supports 3 Multi-room zones, versus 2 for the SR6014. Supported voice control technologies are identical - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both AVR-X8500H and SR6014 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.