It’s strongly recommended to compare different receivers if you want to choose the best one: Pioneer VSX-S520 vs Pioneer VSX-531.
AV receivers under review have the same number of channels. In terms of power, there are differences, the VSX-S520 has such a ratio W/Ohm - 50/4 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 VSX-S520 it is 0.09%, but for the VSX-531 it is 0.08%.
Competitive models use the same DAC. None of the compared opponents supports Bi-amping. Both Pioneer VSX-S520 and Pioneer VSX-531 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. The VSX-S520 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 VSX-S520 and the VSX-531. Video scaling is only possible with the VSX-S520. Operation with the Dolby Vision is only possible with the VSX-S520.
The number of HDMI inputs/outputs is the same - 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the VSX-S520 and the VSX-531. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. VSX-S520 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 Pioneer VSX-S520. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in VSX-531. The Pioneer VSX-S520 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the VSX-S520. Only in the VSX-S520 realized a DTS:X surround technology.
The Pioneer VSX-S520 is better receiver in this comparison. Check Pioneer VSX-S520 price