It’s strongly recommended to compare different receivers if you want to choose the best one: Denon AVR-S640H vs Pioneer VSX-531.
The number of channels for receivers is different - 5.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the AVR-S640H has such a ratio W/Ohm - 75/8 20Hz-20KHz, 100/6 1KHz, while the VSX-531 has a power of 80/8 20Hz-20KHz, 140/6 1KHz. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the AVR-S640H received the model 192 KHz/32-bit, but the VSX-531 is equipped with 192 KHz/24-bit. None of the compared opponents supports Bi-amping. Both Denon AVR-S640H 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-S640H. Each of the receivers has a Bluetooth connector. The AVR-S640H 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-S640H and the VSX-531. None of the devices can increase the resolution of the incoming video signal. Operation with the Dolby Vision is only possible with the AVR-S640H.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-S640H has 5/1, and the VSX-531 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the AVR-S640H and the VSX-531. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-S640H 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-S640H. There is an ECO mode in either AV receiver. The Denon AVR-S640H can be properly configured using the setup assistant.
Generally no support for a Dolby Atmos multichannel audio format. A DTS:X surround technology is not supported by devices from our comparison.
The Denon AVR-S640H is better receiver in this comparison. Check Denon AVR-S640H price