It makes sense comparing Yamaha RX-V4A vs Marantz SR7015 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-V4A has 5.2 versus 9.2 for Marantz SR7015. Regarding power, then RX-V4A has such a W/Ohm ratio - 80/6 when SR7015 has a power of 125/8, 165/6. The THD is 0.06% for the RX-V4A but 0.05% for the SR7015. Both the RX-V4A and the SR7015 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. 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 RX-V4A can work with the audio stream from Deezer, TIDAL, Pandora, SiriusXM, Qobuz, and the SR7015 can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud.
Both AV receivers support HDR10 technology (High dynamic range). Compared AV receivers retain the quality of 4K/120Hz 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 Yamaha RX-V4A has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz SR7015. 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. Both models support the standard HDCP 2.3. The SR7015 has a built-in phono stage for connecting a vinyl player. The RX-V4A supports voice control via Amazon Alexa, Google Assistant, Siri, and the SR7015 - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-V4A and SR7015 can be configured using the Setup assistant.
Only the SR7015 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR7015.