The Sony STR-ZA810ES vs Marantz AV7703 comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Sony STR-ZA810ES has 7.2 versus 11.2 for Marantz AV7703. The THD is 0.09% for the STR-ZA810ES but 0.08% for the AV7703.
Characteristics of digital to analog converter (DAC) are different, 384 KHz/32-bit for STR-ZA810ES and 192 KHz/32-bit for the AV7703. Both the STR-ZA810ES and the AV7703 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 Sony STR-ZA810ES has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. 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 Sony STR-ZA810ES has 6/2 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz AV7703. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the STR-ZA810ES. 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. The AV7703 has a built-in phono stage for connecting a vinyl player.
The STR-ZA810ES supports 2 Multi-room zones, versus 3 for the AV7703. The STR-ZA810ES supports voice control via Google Assistant, and the AV7703 - Amazon Alexa, Google Assistant, Siri, Josh.AI. An ECO mode is only available for the AV7703. Both STR-ZA810ES and AV7703 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.