It’s strongly recommended to compare different receivers if you want to choose the best one: Onkyo TX-NR575 vs Onkyo TX-RZ720.
AV receivers under review have the same number of channels. In terms of power, there are differences, the TX-NR575 has such a ratio W/Ohm - 135/6, while the TX-RZ720 has a power of 175/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the TX-NR575 received the model 384 KHz/32-bit, but the TX-RZ720 is equipped with VLSC 384 KHz/32-bit. Each of the compared opponents supports Bi-amping. Both Onkyo TX-NR575 and Onkyo TX-RZ720 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, 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-NR575 works with Deezer, TIDAL, Pandora, TuneIn Radio, but the Onkyo TX-RZ720 works with Deezer, TIDAL, TuneIn Radio.
The HDR10 function is present in each of the rivals. 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-NR575 and the TX-RZ720. None of the devices can increase the resolution of the incoming video signal. Each of the participants of the comparison has a Dolby Vision.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-NR575 has 4/1, and the TX-RZ720 has 7/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-NR575 and the TX-RZ720. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-NR575 and TX-RZ720 support the standard HDCP 2.2. 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. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in neither AV receiver. The Onkyo TX-NR575 and the Onkyo TX-RZ720 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.