It’s strongly recommended to compare different receivers if you want to choose the best one: Denon AVR-X6400H vs Pioneer VSX-531.
The number of channels for receivers is different - 11.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the AVR-X6400H has such a ratio W/Ohm - 140/8, 250/6, while the VSX-531 has a power of 80/8, 140/6. The value of total harmonic distortion is also different, and for the AVR-X6400H it is 0.05%, but for the VSX-531 it is 0.08%.
The manufacturer installed different DACs, the AVR-X6400H received the model AK4458 384 KHz/32-bit, but the VSX-531 is equipped with 192 KHz/24-bit. The Bi-amping function is implemented only in the Denon AVR-X6400H. Both Denon AVR-X6400H and Pioneer 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 AVR-X6400H. Each of the receivers has a Bluetooth connector. The AVR-X6400H has access to the Spotify service.
Support for the HDR function can only boast of each of the AV receivers. 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 AVR-X6400H and the VSX-531. Video scaling is only possible with the AVR-X6400H. Operation with the Dolby Vision is only possible with the AVR-X6400H.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-X6400H has 8/3, and the VSX-531 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the AVR-X6400H. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-X6400H 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 Denon AVR-X6400H. There is an ECO mode in either AV receiver. The Denon AVR-X6400H can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the AVR-X6400H. Only in the AVR-X6400H realized a DTS:X surround technology.