It’s strongly recommended to compare different receivers if you want to choose the best one: Denon AVR-X6500H 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-X6500H has such a ratio W/Ohm - 140/8 20Hz-20KHz, 175/6 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-X6500H it is 0.05%, but for the VSX-531 it is 0.08%.
The manufacturer installed different DACs, the AVR-X6500H received the model 192KHz/32-bit, but the VSX-531 is equipped with 192 KHz/24-bit. The Bi-amping function is implemented only in the Denon AVR-X6500H. Both Denon AVR-X6500H 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-X6500H. Each of the receivers has a Bluetooth connector. The AVR-X6500H has access to the Spotify service. 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-X6500H and the VSX-531. Video scaling is only possible with the AVR-X6500H. Operation with the Dolby Vision is only possible with the AVR-X6500H.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-X6500H 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-X6500H. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-X6500H 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-X6500H. There is an ECO mode in either AV receiver. The Denon AVR-X6500H can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the AVR-X6500H. Only in the AVR-X6500H realized a DTS:X surround technology.
The Denon AVR-X6500H is better receiver in this comparison. Check Denon AVR-X6500H price