Denon AVC-S660H vs Onkyo TX-NR555

      Denon AVC-S660H

      Onkyo TX-NR555
      80
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      82
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      North America
      Europe
      Australia Asia
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      Highlights

      • 5.2 Channels
      • 5.1 Channel Processing
      • 75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      • HDMI 2.1
      • HDR10, HDR10+, Dolby Vision
      • 8K Passthrough, 8K Upscaling
      • Wi-Fi, Bluetooth, Ethernet
      • Phono Input

      Highlights

      • 7.2 Channels
      • 7.1 Channel Processing
      • 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      • Dolby Atmos, DTS:X
      • HDR10, Dolby Vision
      • 4K/60Hz Passthrough, 4K/30Hz Upscaling
      • Wi-Fi, Bluetooth, Ethernet
      • Phono Input

      Disclosure: We earn money from the affiliate links to products associated with content in this article.

      Table of Contents
      1. Overview
      2. Pros and Cons
      3. Advantage of Denon AVC-S660H
      4. Advantage of Onkyo TX-NR555
      5. Common Strengths and Weaknesses
      6. Amplifier
      7. Speaker Configurations
      8. Immersive Audio Formats
      9. HDMI
      10. Inputs and Outputs
      11. Evaluations
      12. Specifications

      1. Overview

      Here we are comparing Denon AVC-S660H to Onkyo TX-NR555 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. The Denon AVC-S660H has 5 channel and the Onkyo TX-NR555 has 7 channel amplifiers.


      Denon AVC-S660H Onkyo TX-NR555

      Denon AVC-S660H was introduced in 2021. It is equipped with 5 channel amplifier with 75 W (8 Ω, 20 Hz - 20 kHz and 2 channel driven) power per channel and is capable of 5.1 maximum channel processing. It , passes 8K/60Hz and 4K/120Hz and upscales from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz video signal.

      Onkyo TX-NR555 was introduced in 2016. It is equipped with 7 channel amplifier with 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) power per channel and is capable of 7.1 maximum channel processing. It supports Dolby Atmos and DTS:X, passes 4K/60Hz and upscales 1080p to 4K video signal.

      We evaluated Denon AVC-S660H and Onkyo TX-NR555 and gave them scores of 80 and 82 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.

      Denon AVC-S660H

      Onkyo TX-NR555

      Amplifier
      84
      Amplifier
      70
      Audio Features
      64
      Audio Features
      86
      Video Features
      99
      Video Features
      92
      Connectivity
      86
      Connectivity
      81
      Zones
      55
      Zones
      77
      Radio
      82
      Radio
      90
      OVERALL
      80
      OVERALL
      82

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

      2. Pros and Cons

      In this section we present pros and cons of Denon AVC-S660H and Onkyo TX-NR555.

      PROS

      Denon AVC-S660H

      Onkyo TX-NR555

      •   Auto Speaker Calibration System with Mic.
      •   HDR10
      •   HDR10+
      •   Dolby Vision
      •   HDMI 2.1
      •   eARC
      •   New HDCP Version
      •   Auto Low Latency Mode Pass-through
      •   VRR
      •   QFT
      •   8K Passthrough
      •   8K Upscaling
      •   Wi-Fi
      •   Bluetooth
      •   Works with Amazon Alexa
      •   Google Assistant
      •   HEOS
      •   3 8K Inputs
      •   USB Input
      •   Phono Input
      •   Composite Video Inputs
      •   Ethernet
      •   Spotify
      •   Tidal
      •   Dolby Atmos
      •   DTS:X
      •   DSD via HDMI
      •   Auto Speaker Calibration System with Mic.
      •   HDR10
      •   Dolby Vision
      •   New HDCP Version
      •   Analog To HDMI Upconversion
      •   Wi-Fi
      •   Bluetooth
      •   Chromecast Built-In
      •   USB Input
      •   Many RCA Line Inputs
      •   Phono Input
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Analog Tuner
      •   Spotify
      •   Tidal

      CONS

      Denon AVC-S660H

      Onkyo TX-NR555

      •   Few Channels - 5.2
      •   Low Power Output - 75 W
      •   No Front Wide Channel Support
      •   5.1 Channel Processing
      •   No Dolby Atmos
      •   No Dolby Atmos Height Virtualization
      •   No DTS:X
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No DSD via HDMI
      •   1 HDMI Outputs
      •   Few RCA Line Inputs
      •   No RCA Pre-Outs
      •   No Zones
      •   No Analog Tuner
      •   No Digital Radio
      •   No Pandora
      •   Low Power Output - 80 W
      •   No Front Wide Channel Support
      •   No Dolby Atmos Height Virtualization
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No HDR10+
      •   No eARC
      •   No 8K Passthrough
      •   Does not Work with Amazon Alexa
      •   1 HDMI Outputs
      •   0 8K Input
      •   No RCA Pre-Outs
      •   No Digital Radio
      •   No Pandora


      And here are some specifications which fall into average criteria and are neither in PROs nor in CONs category:

      AVERAGE

      Denon AVC-S660H

      Onkyo TX-NR555

      •   6 HDMI Inputs
      •   Bluetooth 4․2
      •   7.2 Channels
      •   7.1 Channel Processing
      •   6 HDMI Inputs
      •   2 Zones
      •   Bluetooth 4․1 + LE

      3. Advantage of Denon AVC-S660H

      This section shows those features and specifications which are the reason to choose Denon AVC-S660H over Onkyo TX-NR555.

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      Denon AVC-S660H
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      Denon AVC-S660H vs Onkyo TX-NR555
      Certified 4 Ω Performance vs
      Dolby Pro Logic PLII vs
      Audyssey Dynamic EQ vs
      Audyssey Dynamic Volume vs
      HDR10+ vs
      Dynamic HDR vs
      HLG vs
      Enhanced Audio Return Channel (eARC) vs
      Newer HDCP Version 2.3 vs 2.2 (3 inputs / 1 output)
      Auto Low Latency Mode Pass-through vs
      VRR vs
      QFT vs
      Video Signal Passthrough 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) vs up to 4K/60p (RGB/YCbCr4:4:4)
      Video Signal Upscaling from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz vs 1080p to 4K
      Works with Amazon Alexa vs
      AirPlay AirPlay 2 vs AirPlay
      More 8K Inputs 3 vs
      More Composite Video Outputs 1 vs
      Front A/V Inputs USB vs Mini-Jack
      Detachable Power Cord vs
      Napster vs
      Color-Coded Speaker Terminals vs
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, IEC) 135 W (1% THD) vs 130 W (1% THD)
      Wi-Fi Standard IEEE 802.11 a/b/g/n/ac vs IEEE 802.11 a/b/g/n
      Newer Bluetooth Version 4․2 vs 4․1 + LE
      Longer Warranty 3 Years vs 2 Years
      Check out other receivers which are frequently compared to Denon AVC-S660H.
      Denon AVR-S760H
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      7.2 channel

      75 W

      Denon AVR-S660H
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      5.2 channel

      75 W

      Yamaha RX-V4A
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      5.2 channel

      80 W

      Yamaha RX-A2A
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      7.2 channel

      100 W

      Yamaha RX-V6A
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      7.2 channel

      100 W

      Denon AVR-X1700H
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      7.2 channel

      80 W

      Yamaha RX-A4A
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      7.2 channel

      110 W

      Yamaha RX-A6A
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      9.2 channel

      150 W

      Yamaha RX-A8A
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      11.2 channel

      150 W

      Denon AVC-S670H
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      5.2 channel

      75 W

      Denon AVR-S670H
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      5.2 channel

      75 W

      Denon AVR-X2800H DAB
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      7.2 channel

      95 W

      4. Advantage of Onkyo TX-NR555

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR555 over Denon AVC-S660H.

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      Onkyo TX-NR555
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      Denon AVC-S660H vs Onkyo TX-NR555
      More Channels 5.2 vs 7.2
      Higher Power Output 75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) vs 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Bi-amp capability vs
      More Channel Processing 5.1 vs 7.1
      Dolby Atmos vs up to 5.1.2
      Dolby Surround Upmixer vs
      DTS:X vs up to 5.1.2
      DTS Neural:X vs after firmware update
      DTS-ES vs
      Network Audio Formats MP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, DSD vs FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, MPEG-4 AAC, LPCM
      Music Playback via USB MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD vs FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
      High Resolution Audio Formats via USB Apple Lossless, WAV, FLAC, DSD vs FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD
      DSD via HDMI vs 2-ch/Multi-ch Input
      Jitter Reduction vs PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
      DTS Dialog Control vs
      Analog To HDMI Upconversion vs Component**, Composite
      Chromecast Built-In vs
      More Coaxial Inputs/Outputs vs 1
      More RCA Line Inputs 3 vs 7 (1 Front)
      More Component Video Inputs vs 2
      More Zones 1 vs 2
      Analog Tuner vs FM/AM with RDS
      More Speaker Terminals 5 vs 9
      More Large Speaker Terminals 5 vs 9
      Bigger Power Supply 340 W vs 450 W
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA) 150 W (10% THD) vs 160 W (10% THD)
      Higher S/N Ratio (Line, IHF-A) 98 dB vs 106 dB
      Higher S/N Ratio (Phono MM, IHF-A) 74 dB vs 80 dB

      5. Common Strengths and Weaknesses

      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.

      STRENGTHS Denon AVC-S660H Onkyo TX-NR555
        Auto Speaker Calibration System with Mic. Audyssey MultEQ AccuEQ with AccuReflex™
        HDR10
        Dolby Vision
        New HDCP Version2.32.2 (3 inputs / 1 output)
        Wi-Fi
        Bluetooth SBC SBC, AAC
        USB Input1 Front for USB memory1 (Rear)
        Phono Input
        Composite Video Inputs22
        Ethernet
        Spotify
        Tidal
      WEAKNESSES Denon AVC-S660H Onkyo TX-NR555
        Low Power Output75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
        No Front Wide Channel Support
        No Dolby Atmos Height Virtualization
        No IMAX Enhanced
        No Auro 3D with Auro-Matic Upmixer
        Few HDMI Outputs11
        No RCA Pre-Outs0.20.2
        No Digital Radio
        No Pandora

      6. Amplifier

      Denon AVC-S660H Onkyo TX-NR555

      5 channel Amplifier: Denon AVC-S660H features 5 channel power amplifier. It is rated at 75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

      7 channel Amplifier: Onkyo TX-NR555 features 7 channel power amplifier. It is rated at 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven).
      • Dynamic Audio Amplification: Onkyo TX-NR555 features Dynamic Audio Amplification which is Onkyo’s amplification philosophy that focuses on capturing the energy and dynamism contained in the audio signal and reproducing it without loss. Audio signals are not static like a test tone, but rather a countless collection of constantly moving waves. While static measurements such as S/N ratio and Total Harmonic Distortion are important, Onkyo believes that excellent dynamic and transient response is the key to emotionally involving sound. Dynamism - the “life” in music - is achieved when the amp can respond to changes in the signal instantaneously, so notes start and stop naturally and the nuances in attack, decay, sustain, and release are voiced with conviction. Onkyo home theater receivers represent the culmination of almost 70 years’ experience in amplifier design. The unique elements of their amplification system comprise high-current, low-impedance architecture to accurately control large speaker cones while enabling instantaneous response to dynamic changes, and discrete wide-range amplifier circuit topology to eliminate phase shift for clear and accurate audio imaging.


      AMPLIFIER Denon AVC-S660H Onkyo TX-NR555
      Channels5.27.2
      Power Output75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Bi-amp Capability

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      Denon AVC-S660H
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      7. Speaker Configurations

      Denon AVC-S660H's and Onkyo TX-NR555's amplifiers can be assigned for different speaker configurations.

      • Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
      • Denon AVC-S660H: Not supported.
      • Onkyo TX-NR555: 5.2.2 with internal amplifier.
      • DTS:X Configurations: The following speaker configurations are supported for DTS:X:
      • Denon AVC-S660H: Not supported.
      • Onkyo TX-NR555: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier.
      • Configurations without height channels: There are also other speaker configurations available which do not include height channels:
      • Denon AVC-S660H: 5.2 with internal amplifier.
      • Onkyo TX-NR555: 5.2, 7.2 with internal amplifier.
      • Bi-Amp: Onkyo TX-NR555 is able to bi-amp up to 2 main channels simultaneously. During bi-amplification two amplifiers are used for one speaker. One amplifier powers the midrange and tweeter section of the speaker and another amplifier powers the low frequency woofers. Each amplifier is less loaded and performs better. In order to use this feature speakers must have 2 pairs of connectors.

      8. Immersive Audio Formats

      Dolby Atmos

      Onkyo TX-NR555 supports Dolby Atmos.

      • Dolby Surround Upmixer: Onkyo TX-NR555 supports Dolby Surround Upmixer. If the content is not mixed in Dolby Atmos then the Dolby surround upmixer will expand the audio to all channels including ceiling speakers. The upmixer has replaced the Dolby Pro Logic II family with improved upmixing algorithms.

      DTS:X

      Onkyo TX-NR555 supports DTS:X.

      • DTS Neural:X: Onkyo TX-NR555 features DTS Neural:X which is an advanced upmixer that can take non DTS:X content and upmix it to the DTS:X speaker layout. It has replaced the DTS Neo family with improved flexibility.
      • DTS Dialog Control: Onkyo TX-NR555 has DTS Dialog Control. This function adjusts the dialog levels during playback of the DTS:X stream. It allows you to separately increase the dialog levels in contrast with the background sound and hear dialog easily even under noisy circumstances.
      AUDIO DECODING Denon AVC-S660H Onkyo TX-NR555
      Dolby Atmos up to 5.1.2
      Dolby Atmos Height Virtualization
      Dolby Atmos Music
      Dolby TrueHD
      Dolby Digital Plus
      Dolby Surround Upmixer
      Dolby Pro Logic PLII
      Dolby Digital EX
      Surround EX
      DTS:X up to 5.1.2
      DTS Neural:X after firmware update
      DTS Virtual:X
      DTS Neo Neo:6 Neo:6 until firmware update
      DTS-HD Master Audio
      DTS-HD High Resolution Audio
      DTS 96/24
      DTS Express
      DTS-ES
      IMAX Enhanced
      Auro 3D with Auro-Matic Upmixer

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      Onkyo TX-NR555
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      9. HDMI

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

      Onkyo TX-NR555 comes with 6 HDMI inputs. It has 1 output.

      • 8K/60Hz and 4K/120Hz Passthrough on Denon AVC-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 Onkyo TX-NR555: All inputs pass up to 4K/60p (RGB/YCbCr4:4:4) video signal.
      • 8K Upscaling on Denon AVC-S660H: It can upscale from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz from HDMI sources.
        4K Upscaling on Onkyo TX-NR555: It can upscale 1080p to 4K from HDMI and analog sources.
      • Analog To HDMI Upconversion: Onkyo TX-NR555 supports analog to HDMI Upconversion, so you can input your analog video sources and output them digitally via HDMI. This means that you will need only one HDMI cable to connect to your TV.
      • 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 AVC-S660H is HDCP 2.3 and Onkyo TX-NR555 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 AVC-S660H supports HDR10, HDR10+, Dolby Vision, Dynamic HDR and Hybrid Log-Gamma.

      Onkyo TX-NR555 supports HDR10 and Dolby Vision. 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 AVC-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 AVC-S660H supports Auto Low Latency Mode (ALLM), Variable Refresh Rate (VRR) and Quick Frame Transport (QFT) for lag-free and smooth gaming.



      VIDEO FEATURES Denon AVC-S660H Onkyo TX-NR555
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.32.2 (3 inputs / 1 output)
      QMS (Quick Media Switching)
      ALLM (Auto Low Latency Mode)
      VRR (Variable Refresh Rate)
      QFT (Quick Frame transport)
      3-D Ready
      Video Signal Passthroughup 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)up to 4K/60p (RGB/YCbCr4:4:4)
      Video Signal Upscaling from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz 1080p to 4K

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      Denon AVC-S660H
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      10. Inputs and Outputs

      Audio

      • Phono Input: There is an MM phono input on Denon AVC-S660H and Onkyo TX-NR555 with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the receiver.
      • Analog Line Inputs: There are 3 pair of line inputs on Denon AVC-S660H and 7 pair of line inputs on Onkyo TX-NR555 for connecting sources with analog outputs.
      • Digital Inputs: 2 optical inputs are available on Denon AVC-S660H and 2 optical inputs and 1 coaxial input are available on Onkyo TX-NR555 for digital audio connections.
      • Headphone Output: There is a 6.3 mm (1/4") headphone output jack on the front panel of each receiver.

      Video

      • HDMI:
      • Denon AVC-S660H
        Inputs:         6   Outputs: 1
        8K Inputs: 3.
      • Onkyo TX-NR555
        Inputs:         6   Outputs: 1
        8K Inputs: 0.
      • Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
      • Denon AVC-S660H
        Inputs:         2   Outputs: 1.
      • Onkyo TX-NR555
        Inputs:         2   Outputs: 0.
      • Component Video: Component video connection gives you the higher quality video compared to the composite video connection. So in case your old DVD player and other equipment do not have an HDMI output but have Component video output use this connection over the composite one. resolution on Component video connectors.
      • Onkyo TX-NR555 supports up to 480i/576i resolution on Component video connectors.
      • Denon AVC-S660H
        Inputs:         0   Outputs: 0.
      • Onkyo TX-NR555
        Inputs:         2   Outputs: 0.

      Front A/V Inputs

      • Denon AVC-S660H: USB
      • Onkyo TX-NR555: Mini-Jack

      Denon AVC-S660H

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      Onkyo TX-NR555

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      TERMINALS Denon AVC-S660H Onkyo TX-NR555
      HDMI Inputs66
      HDMI Outputs11
      8K Inputs3
      USB Input1 Front for USB memory1 (Rear)
      USB DC Out Port
      Optical Inputs22
      Optical Outputs
      Coaxial Inputs1
      RCA Line Inputs37 (1 Front)
      RCA Line Outputs
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs22
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs2
      Component Video Outputs

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      Onkyo TX-NR555
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      11. Evaluations

      We evaluated Denon AVC-S660H and Onkyo TX-NR555 and gave them scores of 80 and 82 out of 100 recpectively. We also gave separate scores for 7 different categories according to the available features and specifications some of which are listed below. These evaluations are relative and may change each time a new receiver is added to the database.


      Denon AVC-S660H

      Onkyo TX-NR555

      OVERALL
      80
      OVERALL
      82

      Amplifier

      GOOD
      84
      •   Few Channels - 5.2
      •   Low Power Output - 75 W
      GOOD
      70
      •   7.2 Channels
      •   Low Power Output - 80 W

      Audio Features

      AVERAGE
      64
      •   Few Channels - 5.2
      •   No Front Wide Channel Support
      •   5.1 Channel Processing
      •   No Dolby Atmos
      •   No Dolby Atmos Height Virtualization
      •   No DTS:X
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No DSD via HDMI
      EXCELLENT
      86
      •   7.2 Channels
      •   No Front Wide Channel Support
      •   7.1 Channel Processing
      •   Dolby Atmos
      •   No Dolby Atmos Height Virtualization
      •   DTS:X
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   DSD via HDMI

      Video Features

      EXCELLENT
      99
      •   HDR10
      •   HDR10+
      •   Dolby Vision
      •   HDMI 2.1
      •   Auto Low Latency Mode Pass-through
      •   VRR
      •   QFT
      •   8K Passthrough
      •   8K Upscaling
      EXCELLENT
      92
      •   HDR10
      •   No HDR10+
      •   Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion

      Connectivity

      EXCELLENT
      86
      •   eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Works with Amazon Alexa
      •   Google Assistant
      •   HEOS
      •   6 HDMI Inputs
      •   1 HDMI Outputs
      •   3 8K Inputs
      •   USB Input
      •   Few RCA Line Inputs
      •   Phono Input
      •   No RCA Pre-Outs
      •   Composite Video Inputs
      •   Ethernet
      •   Bluetooth 4․2
      GOOD
      81
      •   No eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   Chromecast Built-In
      •   6 HDMI Inputs
      •   1 HDMI Outputs
      •   0 8K Input
      •   USB Input
      •   Many RCA Line Inputs
      •   Phono Input
      •   No RCA Pre-Outs
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Bluetooth 4․1 + LE

      Zones

      AVERAGE
      55
      •   No Zones
      GOOD
      77
      •   2 Zones

      Radio

      GOOD
      82
      •   No Analog Tuner
      •   No Pandora
      •   Spotify
      •   Tidal
      EXCELLENT
      90
      •   Analog Tuner
      •   No Pandora
      •   Spotify
      •   Tidal

      12. Specifications

      GENERAL Denon AVC-S660H Onkyo TX-NR555
      BrandDenonOnkyo
      ModelAVC-S660HTX-NR555
      TypeA/V AmplifierA/V Receiver
      CountryUKEurope
      Release Year20212016
      PredecessorDenon AVR-S650H Onkyo TX-NR545
      SuccessorDenon AVC-S670H Onkyo TX-NR575E
      AMPLIFIER Denon AVC-S660H Onkyo TX-NR555
      Channels5.27.2
      Power Output75 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      Discrete Amplification
      Dynamic Audio Amplification
      Non-Phase Shift Amplifier
      VLSC (Vector Linear Shaping Circuitry) Front L/R channels
      Optimum Gain Volume Circuitry
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Discrete Output Stage Circuitry
      3-Stage Inverted Darlington Circuitry
      PUSH-PULL Design
      Mono Block Power Amplifier Construction
      Independent Block Construction (Amp/Preprocessor)
      Bi-amp Capability
      BTL (Bridged Transless or Bridging)
      AUDIO FEATURES Denon AVC-S660H Onkyo TX-NR555
      Digital Signal Processing (DSP) EngineAdvanced 32-bit DSP Chip
      DACAKM AK4458 (8 Channels x 1)
      DAC Specs384 kHz/32 Bit
      Maximum Channel Processing5.17.1
      D.D.S.C. HD Digital
      Alpha Processing
      Air Studios Monitor Certification
      Dolby Atmos up to 5.1.2
      Dolby Atmos Height Virtualization
      Dolby Atmos Music
      Dolby TrueHD
      Dolby Digital Plus
      Dolby Surround Upmixer
      Dolby Pro Logic PLII
      Dolby Digital EX
      Surround EX
      DTS:X up to 5.1.2
      DTS Neural:X after firmware update
      DTS Virtual:X
      DTS Neo Neo:6 Neo:6 until firmware update
      DTS-HD Master Audio
      DTS-HD High Resolution Audio
      DTS 96/24
      DTS Express
      DTS-ES
      IMAX Enhanced
      Auro 3D with Auro-Matic Upmixer
      PCM 2-ch/Multi-ch Input 2-ch/Multi-ch Input
      Network Audio FormatsMP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, DSDFLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, MPEG-4 AAC, LPCM
      Music Playback via USBMP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSDFLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
      High Resolution Music Playback via USB and/or Network up to 192 kHz up to 192 kHz
      High Resolution Audio Formats via USBApple Lossless, WAV, FLAC, DSDFLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD
      Gapless Playback
      DSD via HDMI 2-ch/Multi-ch Input
      DSD via USB 2-ch Input 2-ch Input
      DSD to PCM Converter
      USB DAC
      Jitter Reduction PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
      DTS Dialogue Control
      Dialog Enhancement
      Dialog Level Adjustment
      Dialog normalization
      Dialogue Lift
      Tone Control Front L/R Channels
      Compressed Music Enhancer Advanced Music Optimizer (bluetooth included)
      High-resolution Music Enhancer
      THX Processing Mode
      Audyssey Dynamic EQ
      Audyssey Dynamic Volume
      Audyssey LFC
      Audyssey Sub EQ HT
      Audyssey DSX
      Phase-Matching Bass Boost
      Direct Mode
      Pure Audio Mode
      Pure Direct Analog Path Mode
      Pure Direct Mode
      Virtual Speakers T-D (Theater-Dimensional)
      Independent Subwoofer Outputs
      CALIBRATION Denon AVC-S660H Onkyo TX-NR555
      Auto Speaker Calibration System with Mic. Audyssey MultEQ AccuEQ with AccuReflex™
      Optimized Bass Redirection
      Bass Sync
      VIDEO FEATURES Denon AVC-S660H Onkyo TX-NR555
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDMI Version2.1
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.32.2 (3 inputs / 1 output)
      QMS (Quick Media Switching)
      ALLM (Auto Low Latency Mode)
      VRR (Variable Refresh Rate)
      QFT (Quick Frame transport)
      DSC (Display Stream Compression)
      3-D Ready
      Video Signal Passthroughup 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)up to 4K/60p (RGB/YCbCr4:4:4)
      Video Signal Upscaling from 1080p and 4K up to 8K 50/60Hz and 4K 50/60Hz 1080p to 4K
      Analog To HDMI Upconversion Component**, Composite
      Component Video Upscaling
      Analog to Analog Video conversion
      Component Video Maximum Resolution480i/576i
      isf Certified Calibration Control
      CONNECTIVITY Denon AVC-S660H Onkyo TX-NR555
      Wi-Fi
      Bluetooth SBC SBC, AAC
      Bluetooth Headphone Transmission
      Works with Amazon Alexa
      Google Assistant
      Chromecast Built-In
      Apple Siri
      Works with SonoS
      HEOS
      DTS Play-Fi
      MHL Input
      DLNA 1.5
      AirPlay AirPlay 2 AirPlay
      Apple Product Connection iPod, iPhone and iPad iPod, iPhone and iPad
      Remote App Denon 2016 AVR Remote App for iOS and Android devices and Kindle FireOnkyo Remote App for iPod touch/iPhone and Android-Powered Devices
      InstaPrevue Input Source Prevue
      TERMINALS Denon AVC-S660H Onkyo TX-NR555
      HDMI Inputs66
      HDMI Outputs11
      8K Inputs3
      USB Input1 Front for USB memory1 (Rear)
      USB DC Out Port
      Optical Inputs22
      Optical Outputs
      Coaxial Inputs1
      RCA Line Inputs37 (1 Front)
      RCA Line Outputs
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs22
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs2
      Component Video Outputs
      Ethernet
      Ethernet Switch
      PC In
      Front A/V InputsUSBMini-Jack
      Speaker A/B
      Headphone Out6.3 mm (1/4")6.3 mm (1/4")
      Detachable Power Cord
      uport
      ZONES Denon AVC-S660H Onkyo TX-NR555
      Number of Zones12
      Powered Zones 2
      Zone 2 OutsRCA Line Out
      Whole House Mode
      RS-232C Interface
      +12V Trigger Output0
      Remote (IR) Input/Output0 / 00 / 0
      MISCELLANEOUS Denon AVC-S660H Onkyo TX-NR555
      On-Screen Display Hybrid Graphic User Interface Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up
      GUI Languages99
      Web Control
      IP Control
      Control4 SDDP
      Display 1 line
      Remote ControllerRC-1243
      Pre-programmed / Learnable / LCD Display / /
      ONKYO-RI System Control
      RIHD (Remote Interactive Over HDMI)
      Pre-Pro/Learning Remote /
      On Screen Remote Programming
      Bi-directional Remote Setup via GUI
      Smart Grid-Ready
      Denon Link HD
      Setup Assistant
      Quick Select plus / Quick Select /
      RADIO Denon AVC-S660H Onkyo TX-NR555
      Analog Tuner FM/AM with RDS
      Presets40
      Digital Radio
      Internet Radio TuneIn TuneIn
      Pandora
      Spotify
      Tidal
      Deezer
      Napster
      SiriusXM
      CONSTRUCTION Denon AVC-S660H Onkyo TX-NR555
      Front Panelnot Metal
      Solid Aluminum Front
      Speaker Terminals59
      Large Speaker Terminals59
      Color-Coded Speaker Terminals
      Transparent High-Grade Speaker Terminals
      High Grade Audio Components
      Gold plated RCA terminals
      POWER Denon AVC-S660H Onkyo TX-NR555
      Power SupplyAC 230 V, 50/60 HzAC 220-240 V, 50/60 Hz
      Independent Power Supply
      H.C.P.S. (High Current Power Supply) Massive High Power Transformer
      Toroidal Transformer
      Power Consumption340 W450 W
      No Sound PowerECO On/Off: 29 W/39 W55 W
      Standby Power0.1 W0.15 W
      ECO Mode / Hybrid Standby Function
      Auto Power off
      PHYSICAL Denon AVC-S660H Onkyo TX-NR555
      Dimensions (W x H x D)434 mm x 151 mm x 339 mm (with antenna: 434 mm x 215 mm x 339 mm)
      17 1/8" x 6" x 13 3/8" (with antenna: 17 1/8" x 8 1/2" x 13 3/8")      		435 mm x 173.5 mm x 378 mm
      17-1/8" x 6-13/16" x 14-7/8"
      Dimensions of Package (W x H x D)523 mm x 232 mm x 435 mm
      20.6"e; x 9.1"e; x 17.1"e;
      Weight7.8 kg (17 lbs 3 oz)9.6 kg (21.2 lbs)
      Weight of Package9.7 kg (21.4 lbs)
      SPECIFICATIONS Denon AVC-S660H Onkyo TX-NR555
      Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)75 W (0.08% THD)
      Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)100 W (0.7% THD)
      Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)150 W (10% THD)160 W (10% THD)
      Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)135 W (1% THD)130 W (1% THD)
      Dynamic Power per Channel (3 Ω, Front)160 W
      Dynamic Power per Channel (4 Ω, Front)125 W
      Dynamic Power per Channel (8 Ω, Front)85 W
      THD0.08% (20 Hz - 20 kHz, Half power)
      Phono Distortion0.03% (1 kHz, 3 V)
      Input Sensitivity and Impedance (Line)200 mV/47 kΩ200 mV/47 kΩ (1 kHz, 100 W/8 Ω)
      Input Sensitivity and Impedance (Phono MM)2.5 mV3.5 mV/47 kΩ
      Rated Headphone Jack Output Level and Impedance330 Ω
      Rated Headphone Power Output85 mW (32 Ω, 1 kHz, 10% THD)
      Phono Overload70 mV (MM, 1 kHz 0.5%)
      S/N Ratio (Line, IHF-A)98 dB106 dB
      S/N Ratio (Phono MM, IHF-A)74 dB80 dB
      Phono RIAA Deviation±1 dB (20-20 kHz)
      Frequency Response (Analog In)+1/-3 dB (10 Hz to 100 kHz, Direct mode)10 Hz - 100 kHz/+1 dB, -3 dB (Direct/Pure Audio)
      DSD Sampling Rates via HDMI2.8 MHz
      DSD Sampling Rates via USB5.6 MHz, 2.8 MHz2.8 MHz, 5.6 MHz
      Video Input Sensitivity/Output Level and Impedance 1 Vp-p/75 Ω (Composite)1 Vp-p/75 Ω (Component Y)
      0.7 Vp-p/75 Ω (Component PB/CB, PR/CR)
      1 Vp-p/75 Ω (Composite)
      Video Frequency Response5 Hz to 10 MHz, 0 dB/-3 dB (Composite)
      Ethernet Standard100BASE-TX10BASE-T/100BASE-TX
      Wi-Fi StandardIEEE 802.11 a/b/g/n/acIEEE 802.11 a/b/g/n
      Wi-Fi Terminal Frequency5 GHz, 2.4 GHz5 GHz, 2.4 GHz
      Bluetooth Version4․24․1 + LE
      Bluetooth Frequency2.4 GHz2.4 GHz
      USB TerminalUSB2.0 5V, 1 A5 V, 1 A
      FM Frequency87.5 MHz - 108.0 MHz
      FM Harmonic Distortion (IHF, 1 kHz)Mono/Stereo: 0.7%/1.0%
      AM Frequency522/530 kHz - 1611/1710 kHz
      Warranty3 Years2 Years

      * - 480i/576i and 480p/576p only
      ** - 480i/576i only
      *** - no 1080p/24 upconversion
      **** - 1080p signal is not converted

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