It makes sense comparing Sony STR-ZA3100ES vs Marantz SR6014 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Sony STR-ZA3100ES has 7.2 versus 9.2 for Marantz SR6014. Regarding power, then STR-ZA3100ES has such a W/Ohm ratio - 70/8, 90/6 when SR6014 has a power of 110/8, 185/6. The THD is 0.09% for the STR-ZA3100ES but 0.08% for the SR6014. Both the STR-ZA3100ES 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. Only the SR6014 supports Spotify. 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 SR6014 can scale the input HDMI signal, unlike the STR-ZA3100ES. The HDR standard - Dolby Vision is supported by these receivers.
The Sony STR-ZA3100ES has 6/2 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz SR6014. 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 STR-ZA3100ES supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the SR6014. The SR6014 has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. An ECO mode is only available for the SR6014. Both STR-ZA3100ES 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.