Denon AVR-S660H vs Yamaha RX-A8A review

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It makes sense comparing Denon AVR-S660H vs Yamaha RX-A8A because they both are able to give some premium features.

Amplifier

A significant difference between the receivers in the number of channels, Denon AVR-S660H has 5.2 versus 11.2 for Yamaha RX-A8A. Regarding power, then AVR-S660H has such a W/Ohm ratio - 75/8, 100/6 when RX-A8A has a power of 150/8. The THD is 0.08% for the AVR-S660H but 0.06% for the RX-A8A.

Audio features

Characteristics of digital to analog converter (DAC) are different, 192 KHz/32-bit for AVR-S660H and 384 KHz/32-bit for the RX-A8A. Only the RX-A8A supports Bi-amping feature. The Yamaha RX-A8A can transmit an audio signal directly to the amplifier and bypasses any DSP processing.

Connectivity

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. Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud - all of these streaming services have found application in each of the models.

Video features

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.

Extensive connections

The Denon AVR-S660H has 6/1 HDMI inputs/outputs versus 7/3 HDMI connectors of the Yamaha RX-A8A. 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. Supported voice control technologies are identical - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both AVR-S660H and RX-A8A can be configured using the Setup assistant.

Multichannel surround

Only the RX-A8A has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the RX-A8A.