Denon AVC-S660H AV Receiver

The Denon AVC-S660H receiver is a 5.2-channel 8K AV receiver for home cinema, gaming and music. It features six HDMI inputs, one 8K HDMI output, eARC and built-in HEOS. Its stated output is 75 W per channel with two channels driven.

The foundation of a home cinema system

The 5.2-channel configuration accommodates five main speakers and two subwoofer channels. This makes it possible to create a surround sound system and distribute bass more flexibly around the room.

The 75 W rating is measured into 8 ohms from 20 Hz to 20 kHz at 0.08% THD, with two channels driven. It does not describe the combined output of all five channels operating simultaneously.

HDMI connections and video signals

Three of the six HDMI inputs accept 8K signals. The single HDMI output sends 8K video to a compatible television or projector. The receiver supports 8K/60 Hz passthrough and selected 4K/120 Hz signals.

Upscaling to 8K is available through all six HDMI inputs, which is useful when sources with different resolutions share one 8K display. However, only three inputs accept native 8K signals.

Supported formats include HDR10, HDR10+, HLG, Dolby Vision and Dynamic HDR. The receiver can pass video prepared in these formats from a compatible source to a compatible display.

Gaming features

4K/120 Hz passthrough is intended for high-frame-rate video. VRR helps match the display refresh rate to the source, ALLM automatically activates a low-latency mode, and QFT reduces frame transmission time.

Every part of the HDMI chain must support the required feature. This includes the gaming device, the selected receiver input, the television and the HDMI cables.

TV sound through eARC

With eARC, television audio returns to the receiver through the same HDMI cable. Dolby TrueHD and DTS-HD Master Audio transmission is supported when using an eARC-equipped HDMI connection on the television.

This arrangement reduces the need for separate audio cables. It is particularly useful for television apps and sources connected directly to the TV.

Music sources and multi-room listening

Built-in HEOS enables wireless music streaming and allows the receiver to join a multi-room system. Listed services include Spotify, Amazon Music HD, TIDAL, TuneIn and Deezer. Music can also be played through Bluetooth, AirPlay 2 or the HEOS app.

The front USB input plays MP3, WAV, FLAC, ALAC and DSD files. DSD is supported at 2.8 and 5.6 MHz, making USB convenient for music stored on local media.

Music can be controlled by voice through Amazon Alexa, Google Assistant or Apple Siri. A corresponding voice-assistant environment and suitable devices are required.

Initial setup and everyday control

The Denon Setup Assistant presents the principal connection and configuration steps on the TV screen. It helps with assigning sources correctly and checking speaker connections.

Audyssey MultEQ adjusts system performance to suit the room acoustics. Dynamic EQ adapts the frequency balance at different listening levels, while Dynamic Volume manages pronounced level differences between quiet and loud scenes.

An Audyssey calibration microphone and stand are included. During measurement, position the microphone at ear height in the listening location and keep the room as quiet as possible.

Four front-panel Quick Select buttons store preferred sound settings for individual sources. They provide fast access to configurations chosen for television, gaming or music.

Placement

The enclosure measures 434 × 151 × 339 mm and weighs 9.7 kg. The shelf must support this weight and leave room for the rear connections. Additional depth is needed behind the 339 mm enclosure for HDMI and speaker cables.

An AV receiver requires airflow, so it should not be tightly enclosed in a cabinet recess. Its upper ventilation openings must not be covered by other equipment.

Technical specifications

FAQ

Is the receiver suitable for a 5.1-channel system?

Yes. Its 5.2-channel configuration lets you connect five main speakers and use either one or two subwoofer channels.

Do all HDMI inputs accept an 8K signal?

No. Three of the six HDMI inputs are intended for 8K signals. Upscaling to 8K is available through all six inputs.

How do I connect the television for eARC?

Connect the receiver’s HDMI output to the television’s eARC HDMI port. eARC must be enabled in the settings of both devices.

How do I perform room calibration?

Connect the Audyssey microphone and place it in the listening position. Then follow the Denon Setup Assistant instructions shown on the screen.

How can I play music without a streaming service?

You can use the front USB input, Bluetooth or AirPlay 2. The USB connection also supports FLAC, ALAC and DSD files.

How much cabinet space is required?

The cabinet must accommodate the 434 × 151 × 339 mm enclosure. Extra space is required for rear cables and unobstructed airflow.