An affordable AV receiver is always a good option to consider, so Yamaha AVENTAGE RX-A2080 vs Onkyo TX-RZ730 comparison definitely makes sense.
Considered AV receivers have the same number of channels 9.2. Regarding power, then AVENTAGE RX-A2080 has such a W/Ohm ratio - 140/8, 220/4 when TX-RZ730 has a power of 175/6. The THD is 0.06% for the AVENTAGE RX-A2080 but 0.08% for the TX-RZ730.
Characteristics of digital to analog converter (DAC) are different, ESS SABRE ( ES9007S) 384 KHz/32-bit for AVENTAGE RX-A2080 and AK4458 384 KHz/32-bit for the TX-RZ730. Both the AVENTAGE RX-A2080 and the TX-RZ730 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 Yamaha AVENTAGE RX-A2080 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The AVENTAGE RX-A2080 can work with the audio stream from Deezer, TIDAL, Pandora, Sirius XM, Napster, Qobuz, and the TX-RZ730 can receive a content from Deezer, TIDAL, 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. The AVENTAGE RX-A2080 can scale the input HDMI signal, unlike the TX-RZ730. The HDR standard - Dolby Vision is supported by these receivers.
The Yamaha AVENTAGE RX-A2080 has 7/3 HDMI inputs/outputs versus 7/2 HDMI connectors of the Onkyo TX-RZ730. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the AVENTAGE RX-A2080. 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-A2080 supports the protection of digital content of the standard HDCP 2.3, versus HDCP 2.2 in the TX-RZ730. These compared receivers have a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 3 Multi-room zones. The AVENTAGE RX-A2080 supports voice control via Amazon Alexa, Google Assistant, and the TX-RZ730 - Google Assistant. An ECO mode is only available for the AVENTAGE RX-A2080. Both AVENTAGE RX-A2080 and TX-RZ730 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.