It makes sense comparing Denon AVR-X4500H vs Sony STR-DH590 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Denon AVR-X4500H has 9.2 versus 5.2 for Sony STR-DH590. Regarding power, then AVR-X4500H has such a W/Ohm ratio - 125/8, 165/6 when STR-DH590 has a power of 145/6. The THD is 0.05% for the AVR-X4500H but 0.09% for the STR-DH590.
Characteristics of digital to analog converter (DAC) are different, AK4458 384 KHz/32-bit for AVR-X4500H and 192 KHz/32-bit for the STR-DH590. Only the AVR-X4500H supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Only the Denon AVR-X4500H can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the AVR-X4500H supports Spotify.
Both AV receivers support HDR10 technology (High dynamic range). Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The AVR-X4500H can scale the input HDMI signal, unlike the STR-DH590. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVR-X4500H has 8/3 HDMI inputs/outputs versus 4/1 HDMI connectors of the Sony STR-DH590. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the AVR-X4500H. 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 2.2. The AVR-X4500H has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X4500H. The setup assistant will help you configure Denon AVR-X4500H.
Only the AVR-X4500H has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X4500H.