An affordable AV receiver is always a good option to consider, so Sony STR-DN1080 vs Onkyo TX-RZ730 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Sony STR-DN1080 has 7.2 versus 9.2 for Onkyo TX-RZ730. Regarding power, then STR-DN1080 has such a W/Ohm ratio - 120/6 when TX-RZ730 has a power of 175/6. The THD is 0.09% for the STR-DN1080 but 0.08% for the TX-RZ730.
Characteristics of digital to analog converter (DAC) are different, 96 KHz/24-bit for STR-DN1080 and AK4458 384 KHz/32-bit for the TX-RZ730. Both the STR-DN1080 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. 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 STR-DN1080 can work with the audio stream from TIDAL, Pandora, and the TX-RZ730 can receive a content from Deezer, TIDAL, TuneIn Radio. 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 competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the TX-RZ730.
The Sony STR-DN1080 has 6/2 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 STR-DN1080. 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 TX-RZ730 has a built-in phono stage for connecting a vinyl player.
The STR-DN1080 supports 2 Multi-room zones, versus 3 for the TX-RZ730. The STR-DN1080 supports voice control via Google assistant, and the TX-RZ730 - Google Assistant. An ECO mode is not present in each of the AV receivers. Both STR-DN1080 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.