Onkyo TX-RZ840 vs Yamaha RX-V677 – that is a question.
The number of channels for receivers is different - 9.2 versus 7.2, respectively, for devices. In terms of power, there are differences, the TX-RZ840 has such a ratio W/Ohm - 180/6, while the RX-V677 has a power of 90/8, 150/4. The value of total harmonic distortion is also different, and for the TX-RZ840 it is 0.08%, but for the RX-V677 it is 0.09%.
The manufacturer installed different DACs, the TX-RZ840 received the model AKM 384 KHz/32-bit, but the RX-V677 is equipped with Burr-Brown 192 KHz/24-bit. Each of the compared opponents supports Bi-amping. Both Onkyo TX-RZ840 and Yamaha RX-V677 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet access via WIFI is possible on both units. Each of the receivers has a Bluetooth connector. The contenders have differences in the supported services from Apple - AirPlay, AirPlay 2 versus AirPlay respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Onkyo TX-RZ840 works with Deezer, TIDAL, Pandora, TuneIn Radio, but the Yamaha RX-V677 works with Pandora, Napster, JUKE. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the TX-RZ840 and the RX-V677. Video scaling is only possible with the RX-V677. Operation with the Dolby Vision is only possible with the TX-RZ840.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-RZ840 has 7/2, and the RX-V677 has 6/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the TX-RZ840. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-RZ840 and RX-V677 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-RZ840.
Unlike the TX-RZ840 where 3 Multi zones is provided, the RX-V677 works with 2 Multi zones. There is an ECO mode in RX-V677. The Onkyo TX-RZ840 and the Yamaha RX-V677 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-RZ840. Only in the TX-RZ840 realized a DTS:X surround technology.