It’s strongly recommended to compare different receivers if you want to choose the best one: Pioneer VSX-LX102 vs Pioneer VSX-531.
The number of channels for receivers is different - 7.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the VSX-LX102 has such a ratio W/Ohm - 80/8, 170/6, while the VSX-531 has a power of 80/8, 140/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the VSX-LX102 received the model AK4438 384 KHz/32-bit, but the VSX-531 is equipped with 192 KHz/24-bit. The Bi-amping function is implemented only in the Pioneer VSX-LX102. Both Pioneer VSX-LX102 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-LX102 has access to the Spotify service. 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 VSX-LX102 and the VSX-531. Video scaling is only possible with the VSX-LX102. Operation with the Dolby Vision is only possible with the VSX-LX102.
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-LX102 and the VSX-531. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. VSX-LX102 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-LX102. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in either AV receiver. The Pioneer VSX-LX102 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the VSX-LX102. Only in the VSX-LX102 realized a DTS:X surround technology.
The Pioneer VSX-LX102 is better receiver in this comparison. Check Pioneer VSX-LX102 price