The Yamaha RX-V585BL vs Denon AVR-S660H comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Yamaha RX-V585BL has 7.2 versus 5.2 for Denon AVR-S660H. Regarding power, then RX-V585BL has such a W/Ohm ratio - 80/8, 145/6 when AVR-S660H has a power of 75/8, 100/6. The THD is 0.09% for the RX-V585BL but 0.08% for the AVR-S660H.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 384 KHz/32-bit for RX-V585BL and 192 KHz/32-bit for the AVR-S660H. Only the RX-V585BL supports Bi-amping feature. The Yamaha RX-V585BL can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay, AirPlay 2. Spotify can be used on each receiver. The RX-V585BL can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, and the AVR-S660H can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud.
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 Yamaha RX-V585BL 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 RX-V585BL 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. The RX-V585BL supports voice control via Amazon Alexa, Google Assistant, Siri, and the AVR-S660H - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-V585BL and AVR-S660H can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.