Yamaha RX-V581 vs Denon AVR-S940H comparison definitely makes sense.
Considered AV receivers have the same number of channels 7.2. Regarding power, then RX-V581 has such a W/Ohm ratio - 115/6 when AVR-S940H has a power of 90/8, 125/6. The THD is 0.09% for the RX-V581 but 0.08% for the AVR-S940H.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V581 and 192 KHz/32-bit for the AVR-S940H. Only the RX-V581 supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models have the ability to connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Yamaha RX-V581 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The RX-V581 can work with the audio stream from Pandora, JUKE, and the AVR-S940H can receive a content from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud. 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 AVR-S940H can scale the input HDMI signal, unlike the RX-V581. Dolby Vision technology found support only on the AVR-S940H.
The Yamaha RX-V581 has 4/1 HDMI inputs/outputs versus 8/2 HDMI connectors of the Denon AVR-S940H. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. 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 AVR-S940H has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-V581 and AVR-S940H 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.