It’s strongly recommended to compare different receivers if you want to choose the best one: Onkyo TX-NR555 vs Yamaha RX-A780.
AV receivers under review have the same number of channels. In terms of power, there are differences, the TX-NR555 has such a ratio W/Ohm - 130/6, while the RX-A780 has a power of 95/8, 160/4. The value of total harmonic distortion is also different, and for the TX-NR555 it is 0.08%, but for the RX-A780 it is 0.06%.
The manufacturer installed different DACs, the TX-NR555 received the model Hi-Grade 384 KHz/32-bit, but the RX-A780 is equipped with Burr-Brown 384 KHz/32-bit. Each of the compared opponents supports Bi-amping. Both Onkyo TX-NR555 and Yamaha RX-A780 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
These units have the same Wi-Fi modules. Each of the receivers has a Bluetooth connector. The contenders have differences in the supported services from Apple - AirPlay versus AirPlay, AirPlay 2 respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Onkyo TX-NR555 works with Deezer, TIDAL, Pandora, but the Yamaha RX-A780 works with Deezer, TIDAL, Pandora, Napster, SiriusXM, Qobuz. 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-NR555 and the RX-A780. Video scaling is only possible with the RX-A780. Operation with the Dolby Vision is only possible with the RX-A780.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-NR555 has 6/1, and the RX-A780 has 7/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the RX-A780. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The TX-NR555 has support for the standard HDCP 2.2, compared to the RX-A780, which supports the standard HDCP 2.3. Like most receivers, our models have a built-in phono stage for connecting a vinyl player.
Ability to create 2 Multi zones inherent in both AV receivers. There is an ECO mode in either AV receiver. The Yamaha RX-A780 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available both models. A DTS:X surround technology is supported by devices from our comparison.