It makes sense comparing Denon AVR-S570BT vs Denon AVR-X8500HA because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Denon AVR-S570BT has 5.2 versus 13.2 for Denon AVR-X8500HA. Regarding power, then AVR-S570BT has such a W/Ohm ratio - 70/8, 90/6 when AVR-X8500HA has a power of 150/8, 190/6. The THD is the same and is 0.08%.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/32-bit. Only the AVR-X8500HA supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the AVR-X8500HA supports Spotify.
Both AV receivers support HDR10+ technology (High dynamic range). Compared AV receivers retain the quality of 4K/120Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. Both rivals can scale the resolution of the incoming HDMI signal. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVR-S570BT has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Denon AVR-X8500HA. The HDMI Audio Return Channel (ARC) feature supports both devices. HDMI eARC is available in each model. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.3. The AVR-X8500HA has a built-in phono stage for connecting a vinyl player. It is also worth noting that the ECO mode is presented in each of the receivers. Both AVR-S570BT and AVR-X8500HA can be configured using the Setup assistant.
Only the AVR-X8500HA has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X8500HA.