It’s strongly recommended to compare different receivers if you want to choose the best one: Onkyo PR-RZ5100 vs Pioneer VSX-531.
The number of channels for receivers is different - 11.2 versus 5.1, respectively, for devices. The value of total harmonic distortion is also different, and for the PR-RZ5100 it is 0.06%, but for the VSX-531 it is 0.08%.
The manufacturer installed different DACs, the PR-RZ5100 received the model AKM 384 KHz/32-bit, but the VSX-531 is equipped with 192 KHz/24-bit. The Bi-amping function is implemented only in the Onkyo PR-RZ5100. The model VSX-531 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet connection via WIFI is only possible with PR-RZ5100. Each of the receivers has a Bluetooth connector. The PR-RZ5100 has access to the Spotify service. 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 PR-RZ5100 and the VSX-531. Video scaling is only possible with the PR-RZ5100. Operation with the Dolby Vision is only possible with the PR-RZ5100.
The number of HDMI inputs/outputs varies depending on the receiver, the PR-RZ5100 has 8/2, and the VSX-531 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the PR-RZ5100 and the VSX-531. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. PR-RZ5100 and VSX-531 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo PR-RZ5100. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in VSX-531. The Onkyo PR-RZ5100 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the PR-RZ5100. Only in the PR-RZ5100 realized a DTS:X surround technology.