The Yamaha RX-V6A 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-V6A has 7.2 versus 5.2 for Denon AVR-S660H. Regarding power, then RX-V6A has such a W/Ohm ratio - 100/8 when AVR-S660H has a power of 75/8, 100/6. The THD is 0.06% for the RX-V6A but 0.08% for the AVR-S660H. Only the RX-V6A supports Bi-amping feature. The Yamaha RX-V6A 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-V6A can work with the audio stream from Deezer, TIDAL, Pandora, SiriusXM, Qobuz, and the AVR-S660H can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud.
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 Yamaha RX-V6A has 7/1 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. Both models support the standard HDCP 2.3. These compared receivers have a built-in phono stage for connecting a vinyl player. The RX-V6A 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-V6A and AVR-S660H can be configured using the Setup assistant.
Only the RX-V6A has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-V6A.