Yamaha RX-V581 vs Yamaha R-N803BL comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V581 has 7.2 versus 2.0 for Yamaha R-N803BL. Regarding power, then RX-V581 has such a W/Ohm ratio - 115/6 when R-N803BL has a power of 100/8, 160/4. The THD is 0.09% for the RX-V581 but 0.01% for the R-N803BL.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 192 KHz/24-bit for RX-V581 and ESS SABRE (9006AS) 192 KHz/24-bit for the R-N803BL. 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 Apple Music service is implemented on considered devices: AirPlay. Spotify can be used on each receiver. The RX-V581 can work with the audio stream from Pandora, JUKE, and the R-N803BL can receive a content from Deezer, TIDAL, Pandora, Sirius XM.
Only the Yamaha RX-V581 has support for High dynamic range (HDR). Only the RX-V581 provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. The HDR standard - Dolby Vision is not supported by these receivers. Only the RX-V581 supports HDMI Audio Return Channel (ARC). Unfortunately, HDMI eARC is not available on monitored devices. Of the two receivers in our comparison, HDMI CEC is present in only the RX-V581. The R-N803BL has a built-in phono stage for connecting a vinyl player. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Yamaha RX-V581.
Only the RX-V581 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-V581.