It makes sense comparing Yamaha AVENTAGE RX-A3080 vs Onkyo TX-NR595 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha AVENTAGE RX-A3080 has 9.2 versus 7.2 for Onkyo TX-NR595. Regarding power, then AVENTAGE RX-A3080 has such a W/Ohm ratio - 150/8, 230/4 when TX-NR595 has a power of 80/8, 170/6. The THD is 0.06% for the AVENTAGE RX-A3080 but 0.08% for the TX-NR595.
Characteristics of digital to analog converter (DAC) are different, ESS SABRE 384 KHz/32-bit for AVENTAGE RX-A3080 and AKM 384 KHz/32-bit for the TX-NR595. Both the AVENTAGE RX-A3080 and the TX-NR595 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 Apple Music service is implemented on considered devices: AirPlay, AirPlay 2. Spotify can be used on each receiver. The AVENTAGE RX-A3080 can work with the audio stream from Deezer, TIDAL, Pandora, Sirius XM, Napster, Qobuz, and the TX-NR595 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio.
Both AV receivers support HDR10 technology (High dynamic range). 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 Yamaha AVENTAGE RX-A3080 has 7/3 HDMI inputs/outputs versus 6/2 HDMI connectors of the Onkyo TX-NR595. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the AVENTAGE RX-A3080. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The AVENTAGE RX-A3080 supports the protection of digital content of the standard HDCP 2.3, versus HDCP 2.2 in the TX-NR595. These compared receivers have a built-in phono stage for connecting a vinyl player.
The AVENTAGE RX-A3080 supports 3 Multi-room zones, versus 2 for the TX-NR595. The AVENTAGE RX-A3080 supports voice control via Amazon Alexa, Google Assistant, and the TX-NR595 - Google Assistant. An ECO mode is only available for the AVENTAGE RX-A3080. Both AVENTAGE RX-A3080 and TX-NR595 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.