Denon AVR-S650H vs Yamaha RX-V4A comparison definitely makes sense.
Considered AV receivers have the same number of channels 5.2. Regarding power, then AVR-S650H has such a W/Ohm ratio - 75/8, 100/6 when RX-V4A has a power of 80/6. The THD is 0.08% for the AVR-S650H but 0.06% for the RX-V4A. Only the RX-V4A supports Bi-amping feature. 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-S650H can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, Mood Mix, and the RX-V4A can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Qobuz.
Both AV receivers support HDR10 technology (High dynamic range). HDMI signal transmission in standby mode is implemented in each of the devices. The RX-V4A can scale the input HDMI signal, unlike the AVR-S650H. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVR-S650H has 5/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Yamaha RX-V4A. 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 AVR-S650H has a built-in phono stage for connecting a vinyl player. The AVR-S650H supports voice control via Amazon Alexa, Google Assistant, Siri, Josh.AI, and the RX-V4A - Amazon Alexa, Google Assistant, Siri. It is also worth noting that the ECO mode is presented in each of the receivers. Both AVR-S650H and RX-V4A can be configured using the Setup assistant.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.