Pioneer VSX-531 vs Onkyo TX-8270 – that is a question.
The number of channels for receivers is different - 5.1 versus 2.0, respectively, for devices. In terms of power, there are differences, the VSX-531 has such a ratio W/Ohm - 80/8, 140/6, while the TX-8270 has a power of 160/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the VSX-531 received the model 192 KHz/24-bit, but the TX-8270 is equipped with AK4438 384 KHz/32-bit. None of the compared opponents supports Bi-amping. Both Pioneer VSX-531 and Onkyo TX-8270 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. The TX-8270 has access to the Spotify service.
Support for the HDR function can only boast of each of the AV receivers. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. HDMI signal transmission in standby mode can provide only 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 TX-8270.
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-531 and the TX-8270. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. VSX-531 and TX-8270 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-8270. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in VSX-531. The Onkyo TX-8270 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.