Having had an opportunity to test Denon AVR-X8500HSP vs Pioneer VSX-933, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 13.2 versus 7.2, respectively, for devices. In terms of power, there are differences, the AVR-X8500HSP has such a ratio W/Ohm - 150/8, 190/6, while the VSX-933 has a power of 80/8, 165/6. The value of total harmonic distortion is also different, and for the AVR-X8500HSP it is 0.05%, but for the VSX-933 it is 0.08%.
The manufacturer installed different DACs, the AVR-X8500HSP received the model AK4490 384 KHz/32-bit, but the VSX-933 is equipped with AK4458 384 KHz/32-bit. Each of the compared opponents supports Bi-amping. Both Denon AVR-X8500HSP and Pioneer VSX-933 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
These units have the same Wi-Fi modules. Each of the receivers has a Bluetooth connector. The contenders have differences in the supported services from Apple - AirPlay, AirPlay 2 versus AirPlay respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Denon AVR-X8500HSP works with Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, but the Pioneer VSX-933 works with Deezer, TIDAL, Pandora, TuneIn Radio. 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 AVR-X8500HSP and the VSX-933. Each of the devices can increase the resolution of the incoming video signal. Each of the participants of the comparison has a Dolby Vision.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-X8500HSP has 8/3, and the VSX-933 has 6/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the AVR-X8500HSP. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-X8500HSP and VSX-933 support the standard HDCP 2.2. Like most receivers, our models have a built-in phono stage for connecting a vinyl player.
Unlike the AVR-X8500HSP where 3 Multi zones is provided, the VSX-933 works with 2 Multi zones. For voice control in the AVR-X8500HSP is used Amazon Alexa, Google Assistant, Siri, Josh.AI, but in the VSX-933 is used Google Assistant. There is an ECO mode in AVR-X8500HSP. The Denon AVR-X8500HSP and the Pioneer VSX-933 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available both models. A DTS:X surround technology is supported by devices from our comparison.