Denon AVR-S660H vs Denon AVR-S640H

Here we are comparing Denon AVR-S660H to Denon AVR-S640H to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. Both receivers have 5 channel and equally powerful amplifiers.

We evaluated Denon AVR-S660H and Denon AVR-S640H and gave them scores of 81 and 80 out of 100 recpectively. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

For more details about the ranking please go to    Evaluations section.

This section shows those features and specifications which are the reason to choose Denon AVR-S660H over Denon AVR-S640H.

Denon AVR-S660H

We already listed pros and cons of each model. However, you may also find useful to look at their common strengths and weaknesses shown side-by-side.

Denon AVR-S660H's and Denon AVR-S640H's amplifiers can be assigned for different speaker configurations.

• Configurations: Available configurations are:
Denon AVR-S660H: 5.2 with internal amplifier.
Denon AVR-S640H: 5.2 with internal amplifier.

Denon AVR-S660H comes with 3 HDMI 2.1 inputs with 8K support and 3 inputs with 4K support. It has 1 output.

Denon AVR-S640H comes with 5 HDMI inputs. It has 1 output.

• 8K/60Hz and 4K/120Hz Passthrough on Denon AVR-S660H: 3 out of 6 inputs pass up to 8K 50/60Hz (YCbCr 4:2:0/8-bit) and 4K 100/120Hz (RGB/YCbCr 4:4:4/8, 10-bit and YCbCr 4:2:2/12-bit) and the rest of the inputs pass up to 4K 50/60Hz 4:4:4 video signal.
  4K/60Hz Passthrough on Denon AVR-S640H: All inputs pass up to 4K 50/60Hz 4:4:4 video signal.
• 8K Upscaling on Denon AVR-S660H: It can upscale from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz from HDMI sources.
• BT.2020 Color Space: BT.2020 or Rec. 2020 is a color standard which delivers a wider color gamut compared to Rec. 709. It covers approximately 75% of the total visual spectrum while the Rec. 709 covers only 35% (available on both models).
• HDCP Copy Protection: Denon AVR-S660H is HDCP 2.3 and Denon AVR-S640H is HDCP 2.2 compliant which is a requirement for 4K/HDR copy-protected content transmission.
• 3D Ready: Both receivers are able to pass 3D video through HDMI.

HDR (High Dynamic Range)

Denon AVR-S660H supports HDR10, HDR10+, Dolby Vision, Dynamic HDR and Hybrid Log-Gamma.

Denon AVR-S640H supports HDR10, Dolby Vision and Hybrid Log-Gamma. High dynamic range video has greater dynamic range than standard dynamic range (SDR) video with brighter whites and deeper blacks. The result is greater contrast and more details in dark and bright areas, better color and depth.

Enhanced Audio Return Channel (eARC)

Denon AVR-S660H supports Audio Return Channel (ARC) which allows the compatible TV to send audio signal to the a/v receiver through the same HDMI cable which is used to send audio and video signals to the TV. So one HDMI cable is used to transfer audio signal in both directions. New Enhanced ARC will support uncompressed audio formats such as Dolby Atmos, DTS:X, Dolby TrueHD and DTS HD Master Audio whereas the previous ARC could support only Dolby Digital, Dolby Digital Plus, DTS, DTS HD, and PCM.

Gaming Features

Denon AVR-S660H supports Auto Low Latency Mode (ALLM), Variable Refresh Rate (VRR) and Quick Frame Transport (QFT) Denon AVR-S640H supports Auto Low Latency Mode (ALLM) for lag-free and smooth gaming.

For the complete list of specifications please go to the next page: