The Sony STR-DH790 vs Denon AVR-S660H comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Sony STR-DH790 has 7.2 versus 5.2 for Denon AVR-S660H. Regarding power, then STR-DH790 has such a W/Ohm ratio - 90/6 when AVR-S660H has a power of 75/8, 100/6. The THD is 0.09% for the STR-DH790 but 0.08% for the AVR-S660H.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for STR-DH790 and 192 KHz/32-bit for the AVR-S660H. Only the STR-DH790 supports Bi-amping feature. The Sony STR-DH790 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the AVR-S660H supports Spotify.
HDMI signal transmission in standby mode is implemented in each of the devices. The AVR-S660H can scale the input HDMI signal, unlike the STR-DH790. The HDR standard - Dolby Vision is supported by these receivers.
The Sony STR-DH790 has 4/1 HDMI inputs/outputs versus 6/1 HDMI connectors of the Denon AVR-S660H. 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. The STR-DH790 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the AVR-S660H. The AVR-S660H has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-S660H. Both STR-DH790 and AVR-S660H can be configured using the Setup assistant.
Only the STR-DH790 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the STR-DH790.