An affordable AV receiver is always a good option to consider, so Onkyo TX-RZ830 vs Denon AVR-X6700H comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-RZ830 has 9.2 versus 11.2 for Denon AVR-X6700H. Regarding power, then TX-RZ830 has such a W/Ohm ratio - 180/6 when AVR-X6700H has a power of 140/8, 175/6. The THD is 0.08% for the TX-RZ830 but 0.05% for the AVR-X6700H. Both the TX-RZ830 and the AVR-X6700H 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 Onkyo TX-RZ830 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The TX-RZ830 can work with the audio stream from Deezer, TIDAL, TuneIn Radio, and the AVR-X6700H can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Qobuz, TuneIn Radio.
Both AV receivers support HDR10 technology (High dynamic range). HDMI signal transmission in standby mode is implemented in each of the devices. The AVR-X6700H can scale the input HDMI signal, unlike the TX-RZ830. The HDR standard - Dolby Vision is supported by these receivers.
The Onkyo TX-RZ830 has 7/2 HDMI inputs/outputs versus 8/3 HDMI connectors of the Denon AVR-X6700H. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the AVR-X6700H. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The TX-RZ830 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the AVR-X6700H. 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 TX-RZ830 supports voice control via Google Assistant, and the AVR-X6700H - Amazon Alexa, Google Assistant, Siri, Josh.AI. An ECO mode is only available for the AVR-X6700H. Both TX-RZ830 and AVR-X6700H 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.