Designed for 4K or 8K setups, the AVR-S66OH delivers superior 3D audio home theater/gaming experiences and supports the latest HDMI specifications.

Features

• High-performance discrete 5-channel amplifier
• Delivers maximum performance and 75W per channel (8 ohms, 20Hz–20kHz, THD: 0.08%, 2 ch. driven) to provide the classic and dynamic Denon sound experience.
• Full 8K/60Hz and 4K/120Hz support
  
• With the latest HDMI support, enjoy 8K quality video from your 8K source devices. Three 8K inputs and one output allow for 8K/60Hz and 4K/120Hz pass through. 8K upscaling is available on all six HDMI inputs.
• Surround yourself in the sound of your favorite movies, games
  and music
• Utilize Dolby TrueHD and DTS-HD Master Audio formats or their up-mixers Dolby Surround and DTS Neo:6.
• Enhanced Audio Return Channel (eARC) HDMI support
  
• Through the HDMI output, connect your TV with eARC HDMI support to allow uncompressed audio formats like Dolby TrueHD and DTS-HD Master Audio directly from your smart TV app to your AV
  receiver.
• The latest in video compatibility
• The latest HDR format support including HDR10, HDR10+, HLG, Dolby Vision, as well as Dynamic HDR, to provide the greatest picture quality for brightness, clarity and contrast.
• The next generation in movie immersion
• With 8K/60Hz pass-through and upscaling, Dynamic HDR and Quick Media Switching (QMS), enjoy
  crystal clear picture in the highest quality available.
• The latest in gaming experiences
  
• With 4K/120Hz pass-through, Variable Refresh Rate (VRR), Auto Low Latency Mode (ALLM) and Quick Frame Transport (QFT), enjoy your gaming experience with amazing imaging, as well as reduced lag and latency.
• Works with your favorite voice services
• Use your voice to control the AVR-S660H and wireless music services hands-free with Amazon Alexa, Google Assistant, Apple Siri, and Josh.ai.
• Wireless streaming from the most popular music services
  
• Enjoy all of your favorite music services like Spotify®, Pandora®, Amazon Music HD, TIDAL, SiriusXM, Deezer and more. The AVR-S660H also lets you enjoy your music via AirPlay 2, letting you stream your favorite tracks from Apple Music.
• Phono input
• With the included phono input, the AVR-S660H lets you connect your turntable and play your favorite vinyl records. Enjoy your collection with exceptional quality and sound.
• HEOS® Built-in wireless multi-room music streaming technology
• Listen from any room for a connected, whole-home audio experience. The AVR-S660H also works
  with the newly introduced Denon Home speakers to let you enjoy a whole-home audio experience.