It’s strongly recommended to compare different receivers if you want to choose the best one: Marantz SR8015 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 SR8015 has such a ratio W/Ohm - 140/8, 175/6, while the VSX-531 has a power of 80/8, 140/6. The value of total harmonic distortion is also different, and for the SR8015 it is 0.05%, but for the VSX-531 it is 0.08%. The Bi-amping function is implemented only in the Marantz SR8015. Both Marantz SR8015 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 SR8015 has access to the Spotify service. Signaling over HDMI in standby mode can provide the SR8015 and the VSX-531. Video scaling is only possible with the SR8015. Operation with the Dolby Vision is only possible with the SR8015.
The number of HDMI inputs/outputs varies depending on the receiver, the SR8015 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 SR8015. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The SR8015 has support for the standard HDCP 2.3, compared to the VSX-531, which supports the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Marantz SR8015. There is an ECO mode in either AV receiver. The Marantz SR8015 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the SR8015. Only in the SR8015 realized a DTS:X surround technology.