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 20Hz-20KHz, 250/6 1KHz, while the VSX-531 has a power of 80/8 20Hz-20KHz, 140/6 1KHz. 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 60p 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.
The Denon AVR-X6400H is better receiver in this comparison. Check Denon AVR-X6400H price