It’s strongly recommended to compare different receivers if you want to choose the best one: Sony STR-ZA3100ES 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 STR-ZA3100ES has such a ratio W/Ohm - 70/8 20Hz-20KHz, 90/6 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 STR-ZA3100ES it is 0.09%, but for the VSX-531 it is 0.08%. The Bi-amping function is implemented only in the Sony STR-ZA3100ES. Both Sony STR-ZA3100ES and Pioneer VSX-531 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless connection to the Internet via WIFI can not be performed on these receivers. Each of the receivers has a Bluetooth connector. Support for Apple Music Services not implemented. Spotify is not available for these receivers.
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 STR-ZA3100ES 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 STR-ZA3100ES.
The number of HDMI inputs/outputs varies depending on the receiver, the STR-ZA3100ES has 6/2, and the VSX-531 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the STR-ZA3100ES. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. STR-ZA3100ES and VSX-531 support the standard HDCP 2.2. Unlike most receivers, our models do not have a built-in phono stage for connecting a vinyl player. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in VSX-531. The Sony STR-ZA3100ES can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the STR-ZA3100ES. Only in the STR-ZA3100ES realized a DTS:X surround technology.
The Sony STR-ZA3100ES is better receiver in this comparison. Check Sony STR-ZA3100ES price