Onkyo TX-NR646 vs Pioneer VSX-824-K

      Onkyo TX-NR646

      Pioneer VSX-824-K
      83
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      68
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      USA Taiwan
      Europe, Australia and Asia
      Others
      USA
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      Highlights

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

      Highlights

      • 5.2 Channels
      • 5.1 Channel Processing
      • 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      • 4K/60Hz Passthrough
      • Bluetooth, Ethernet

      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 Onkyo TX-NR646
      4. Advantage of Pioneer VSX-824-K
      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 Onkyo TX-NR646 to Pioneer VSX-824-K 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 Onkyo TX-NR646 has 7 channel and the Pioneer VSX-824-K has 5 channel amplifiers with Onkyo TX-NR646's being more powerful.


      Onkyo TX-NR646 Pioneer VSX-824-K

      Onkyo TX-NR646 was introduced in 2015. It is equipped with 7 channel amplifier with 100 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 video signal.

      Pioneer VSX-824-K was introduced in 2014. It is equipped with 5 channel amplifier with 80 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 4K/60Hz video signal.

      We evaluated Onkyo TX-NR646 and Pioneer VSX-824-K and gave them scores of 83 and 68 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.

      Onkyo TX-NR646

      Pioneer VSX-824-K

      Amplifier
      87
      Amplifier
      71
      Audio Features
      84
      Audio Features
      67
      Video Features
      80
      Video Features
      66
      Connectivity
      83
      Connectivity
      73
      Zones
      77
      Zones
      55
      Radio
      91
      Radio
      85
      OVERALL
      83
      OVERALL
      68

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

      2. Pros and Cons

      In this section we present pros and cons of Onkyo TX-NR646 and Pioneer VSX-824-K.

      PROS

      Onkyo TX-NR646

      Pioneer VSX-824-K

      •   Dolby Atmos
      •   DTS:X
      •   DSD via HDMI
      •   Auto Speaker Calibration System with Mic.
      •   HDR10
      •   New HDCP Version
      •   Analog To HDMI Upconversion
      •   Wi-Fi
      •   Bluetooth
      •   8 HDMI Inputs
      •   USB Input
      •   Many RCA Line Inputs
      •   Phono Input
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   Independent Power Supply
      •   DSD via HDMI
      •   Auto Speaker Calibration System with Mic.
      •   Bluetooth
      •   USB Input
      •   Composite Video Inputs
      •   Ethernet
      •   Analog Tuner
      •   Pandora
      •   Spotify

      CONS

      Onkyo TX-NR646

      Pioneer VSX-824-K

      •   No Front Wide Channel Support
      •   No Dolby Atmos Height Virtualization
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No HDR10+
      •   No Dolby Vision
      •   No eARC
      •   No 8K Passthrough
      •   Does not Work with Amazon Alexa
      •   0 8K Input
      •   No RCA Pre-Outs
      •   No Digital Radio
      •   No Tidal
      •   Bluetooth 2․1 + EDR
      •   Few Channels - 5.2
      •   Low Power Output - 80 W
      •   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 HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No eARC
      •   No 8K Passthrough
      •   Does not Work with Amazon Alexa
      •   1 HDMI Outputs
      •   0 8K Input
      •   Few RCA Line Inputs
      •   No Phono Input
      •   No RCA Pre-Outs
      •   No Zones
      •   No Digital Radio
      •   No Tidal


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

      AVERAGE

      Onkyo TX-NR646

      Pioneer VSX-824-K

      •   7.2 Channels
      •   Power Output - 100 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   2 Zones
      •   Wi-Fi
      •   6 HDMI Inputs

      3. Advantage of Onkyo TX-NR646

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR646 over Pioneer VSX-824-K.

      Check the Price

      Onkyo TX-NR646
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      Onkyo TX-NR646 vs Pioneer VSX-824-K
      More Channels 7.2 vs 5.2
      Higher Power Output 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) vs 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Certified 4 Ω Performance vs
      Bi-amp capability vs
      Higher DAC Specs 384 kHz/32 Bit vs 192 kHz/24 Bit
      More Channel Processing 7.1 vs 5.1
      Dolby Atmos up to 5.1.2 after firmware update vs
      Dolby Surround Upmixer vs
      DTS:X up to 5.1.2 after firmware update vs
      DTS-HD High Resolution Audio vs
      DTS-ES vs
      Music Playback via USB FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD vs MP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
      High Resolution Audio Formats via USB FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC vs Apple Lossless, WAV, FLAC, AIFF, DSD
      DSD via HDMI 2-ch/Multi-ch Input vs 2-ch Input
      Jitter Reduction PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio vs
      Virtual Speakers T-D (Theater-Dimensional) vs
      HDR10 vs
      Analog To HDMI Upconversion Component**, Composite vs
      Wi-Fi vs via optional AS-WL300 adapter (sold separately)
      Bluetooth vs via optional AS-BT100 or AS-BT200 adapters (sold separately)
      InstaPrevue Input Source Prevue vs
      More HDMI Inputs 8 (1 front) vs 6 (1 front)
      More HDMI Outputs 2 (simultaneous) vs 1
      More Optical Inputs 2 vs 1
      More RCA Line Inputs 7 vs 3
      More RCA Line Outputs 1 vs
      Phono Input vs
      More Composite Video Inputs 3 vs 2
      More Component Video Inputs 2 vs
      More Zones 2 vs 1
      Analog Tuner FM/AM with RDS vs FM/AM
      More Presets 40 vs 30
      Deezer vs
      More Speaker Terminals 9 vs 5
      More Large Speaker Terminals 9 vs 5
      Bigger Power Supply 630 W vs 450 W
      Higher Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC) 100 W (0.08% THD) vs 80 W (0.08% THD)
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, FTC) 170 W (0.9% THD) vs 140 W (1% THD)
      Higher S/N Ratio (Line, IHF-A) 100 dB vs 98 dB
      Higher DSD Sampling Rate via HDMI 2.8 MHz, 5.6 MHz vs 2.8 MHz
      Wider AM Frequency Range 522/530 kHz - 1611/1710 kHz vs 530 kHz - 1700 kHz
      Longer Warranty 2 Years vs 1 Year

      4. Advantage of Pioneer VSX-824-K

      This section shows those features and specifications which are the reason to choose Pioneer VSX-824-K over Onkyo TX-NR646.

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      Pioneer VSX-824-K
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      Onkyo TX-NR646 vs Pioneer VSX-824-K
      Dolby Pro Logic vs PLII
      Higher Resolution Music Playback via USB up to 96 kHz vs 88.2, 96, 176.4, 192 kHz/24 bit
      DSD to PCM Converter vs
      MHL Input vs 1 Rear (Version 2.0)
      USB DC Out Port vs 1 Rear for AS-WL300 (5 V, 0.6 A)
      More Composite Video Outputs vs 1
      Front A/V Inputs HDMI vs HDMI, USB

      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 Onkyo TX-NR646 Pioneer VSX-824-K
        DSD via HDMI 2-ch/Multi-ch Input 2-ch Input
        Auto Speaker Calibration System with Mic. AccuEQ Advance MCACC Auto
        Bluetooth via optional AS-BT100 or AS-BT200 adapters (sold separately)
        USB Input1 (Rear)1 Front
        Composite Video Inputs32
        Ethernet
        Analog Tuner FM/AM with RDS FM/AM
        Pandora
        Spotify
      WEAKNESSES Onkyo TX-NR646 Pioneer VSX-824-K
        No Dolby Atmos Height Virtualization
        No IMAX Enhanced
        No Auro 3D with Auro-Matic Upmixer
        No HDR10+
        No Dolby Vision
        No eARC
        No 8K Passthroughup to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)up to 4K/60p (4:4:4 24-bit)
      4K/60p (4:2:2 36-bit)
      4K/24p (4:4:4 36-bit)
        Does not Work with Amazon Alexa
        Few 8K Inputs
        No RCA Pre-Outs0.20.2
        No Digital Radio
        No Tidal

      6. Amplifier

      Onkyo TX-NR646 Pioneer VSX-824-K

      7 channel Amplifier: Onkyo TX-NR646 features 7 channel power amplifier. It is rated at 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

      5 channel Discrete Direct Energy Amplifier: Pioneer VSX-824-K features 5 channel power amplifier with Discrete Direct Energy design. It is rated at 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven).
      • WRAT (Wide Range Amp Technology): Onkyo TX-NR646 features Onkyo’s Wide Range Amp Technology (WRAT) circuit layout that prevents phase shifting by pushing the roll-off point higher than the listening-level frequency. Amplifying sound without phase shift creates an uncommonly well-focused and realistic audio image. If phase shift occurs and signal timing is not accurate, then neither is the resulting audio image.


      AMPLIFIER Onkyo TX-NR646 Pioneer VSX-824-K
      Channels7.25.2
      Power Output100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Bi-amp Capability

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      Onkyo TX-NR646
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      7. Speaker Configurations

      Onkyo TX-NR646's and Pioneer VSX-824-K's amplifiers can be assigned for different speaker configurations.

      • Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
      • Onkyo TX-NR646: 5.2.2 with internal amplifier.
      • Pioneer VSX-824-K: Not supported.
      • DTS:X Configurations: The following speaker configurations are supported for DTS:X:
      • Onkyo TX-NR646: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier.
      • Pioneer VSX-824-K: Not supported.
      • Configurations without height channels: There are also other speaker configurations available which do not include height channels:
      • Onkyo TX-NR646: 5.2, 7.2 with internal amplifier.
      • Pioneer VSX-824-K: 5.2 with internal amplifier.
      • Bi-Amp: Onkyo TX-NR646 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-NR646 supports Dolby Atmos.

      • Dolby Surround Upmixer: Onkyo TX-NR646 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-NR646 supports DTS:X.

      • DTS Dialog Control: Both models have 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 Onkyo TX-NR646 Pioneer VSX-824-K
      Dolby Atmos up to 5.1.2 after firmware update
      Dolby Atmos Height Virtualization
      Dolby Atmos Music
      Dolby TrueHD
      Dolby Digital Plus
      Dolby Surround Upmixer
      Dolby Pro Logic PLII
      Surround EX
      DTS:X up to 5.1.2 after firmware update
      DTS Neural:X after firmware update
      DTS Virtual:X
      DTS Neo Neo:6 until firmware update Neo:6
      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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      Pioneer VSX-824-K
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      9. HDMI

      Onkyo TX-NR646 comes with 8 HDMI inputs. It has 2 outputs which work parallelly and output the same signal.

      Pioneer VSX-824-K comes with 6 HDMI inputs. It has 1 output.

      • 4K/60Hz Passthrough: On both receivers all inputs pass up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit) video signal.
      • Analog To HDMI Upconversion: Onkyo TX-NR646 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.
      • HDCP 2.2 Copy Protection: Onkyo TX-NR646 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)

      Onkyo TX-NR646 supports HDR10

      Pioneer VSX-824-K does not support HDR. 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.



      VIDEO FEATURES Onkyo TX-NR646 Pioneer VSX-824-K
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      QMS (Quick Media Switching)
      ALLM (Auto Low Latency Mode)
      VRR (Variable Refresh Rate)
      QFT (Quick Frame transport)
      3-D Ready
      Video Signal Passthroughup to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)up to 4K/60p (4:4:4 24-bit)
      4K/60p (4:2:2 36-bit)
      4K/24p (4:4:4 36-bit)
      Video Signal Upscaling

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      Onkyo TX-NR646
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      10. Inputs and Outputs

      Audio

      • Phono Input: There is an MM phono input on Onkyo TX-NR646 with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the receiver.
      • Analog Line Inputs and Outputs: There are 7 pair of line inputs on Onkyo TX-NR646 and 3 pair of line inputs on Pioneer VSX-824-K for connecting sources with analog outputs. There is also 1 pair of line outputs on Onkyo TX-NR646.
      • Digital Inputs: 2 optical inputs and 1 coaxial input are available on Onkyo TX-NR646 and 1 optical input and 1 coaxial input are available on Pioneer VSX-824-K 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:
      • Onkyo TX-NR646
        Inputs:         8 (1 front)   Outputs: 2 (simultaneous)
        8K Inputs: 0.
      • Pioneer VSX-824-K
        Inputs:         6 (1 front)   Outputs: 1
        8K Inputs: 0.
      • Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
      • Onkyo TX-NR646
        Inputs:         3   Outputs: 0.
      • Pioneer VSX-824-K
        Inputs:         2   Outputs: 1.
      • 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.
      • Onkyo TX-NR646 supports up to 480i/576i resolution on Component video connectors. resolution on Component video connectors.
      • Onkyo TX-NR646
        Inputs:         2   Outputs: 0.
      • Pioneer VSX-824-K
        Inputs:         0   Outputs: 0.

      Front A/V Inputs

      • Onkyo TX-NR646: HDMI
      • Pioneer VSX-824-K: HDMI, USB

      Onkyo TX-NR646

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      Pioneer VSX-824-K

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      TERMINALS Onkyo TX-NR646 Pioneer VSX-824-K
      HDMI Inputs8 (1 front)6 (1 front)
      HDMI Outputs2 (simultaneous)1
      8K Inputs
      USB Input1 (Rear)1 Front
      USB DC Out Port1 Rear for AS-WL300 (5 V, 0.6 A)
      Optical Inputs21
      Optical Outputs
      Coaxial Inputs11
      RCA Line Inputs73
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs32
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs2
      Component Video Outputs

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      Pioneer VSX-824-K
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      11. Evaluations

      We evaluated Onkyo TX-NR646 and Pioneer VSX-824-K and gave them scores of 83 and 68 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.


      Onkyo TX-NR646

      Pioneer VSX-824-K

      OVERALL
      83
      OVERALL
      68

      Amplifier

      EXCELLENT
      87
      •   7.2 Channels
      •   Power Output - 100 W
      •   Independent Power Supply
      GOOD
      71
      •   Few Channels - 5.2
      •   Low Power Output - 80 W

      Audio Features

      GOOD
      84
      •   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
      AVERAGE
      67
      •   Few Channels - 5.2
      •   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
      •   DSD via HDMI

      Video Features

      GOOD
      80
      •   HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion
      AVERAGE
      66
      •   No HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough

      Connectivity

      GOOD
      83
      •   No eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   8 HDMI Inputs
      •   2 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 2․1 + EDR
      GOOD
      73
      •   No eARC
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   6 HDMI Inputs
      •   1 HDMI Outputs
      •   0 8K Input
      •   USB Input
      •   Few RCA Line Inputs
      •   No Phono Input
      •   No RCA Pre-Outs
      •   Composite Video Inputs
      •   Ethernet

      Zones

      GOOD
      77
      •   2 Zones
      AVERAGE
      55
      •   No Zones

      Radio

      EXCELLENT
      91
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal
      EXCELLENT
      85
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal

      12. Specifications

      GENERAL Onkyo TX-NR646 Pioneer VSX-824-K
      BrandOnkyoPioneer
      ModelTX-NR646VSX-824-K
      TypeA/V ReceiverA/V Receiver
      CountryEurope, Australia and AsiaUSA
      Release Year20152014
      PredecessorOnkyo TX-NR636 Pioneer VSX-823-K
      SuccessorOnkyo TX-NR656 Pioneer VSX-830-K
      AMPLIFIER Onkyo TX-NR646 Pioneer VSX-824-K
      Channels7.25.2
      Power Output100 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
      Amplifier DesignDiscrete Direct Energy
      WRAT (Wide Range Amplifier Technology)
      VLSC (Vector Linear Shaping Circuitry)
      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
      Independent Block Construction (Amp/Preprocessor)
      Bi-amp Capability
      BTL (Bridged Transless or Bridging)
      AUDIO FEATURES Onkyo TX-NR646 Pioneer VSX-824-K
      Digital Signal Processing (DSP) EngineDual 32-bit DSP for Powerful Advanced ProcessingTexas Instruments Aureus
      DACAsahi Kasei AK4458
      DAC Specs384 kHz/32 Bit192 kHz/24 Bit
      Maximum Channel Processing7.15.1
      Air Studios Monitor Certification
      Dolby Atmos up to 5.1.2 after firmware update
      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 after firmware update
      DTS Neural:X after firmware update
      DTS Virtual:X
      DTS Neo Neo:6 until firmware update Neo:6
      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
      Music Playback via USBFLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHDMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
      High Resolution Music Playback via USB and/or Network up to 96 kHz 88.2, 96, 176.4, 192 kHz/24 bit
      High Resolution Audio Formats via USBFLAC, WAV, WMA Lossless, Apple Lossless, DSD, AACApple Lossless, WAV, FLAC, AIFF, DSD
      Gapless Playback
      DSD via HDMI 2-ch/Multi-ch Input 2-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
      Auto Level Control2 Channel
      DTS Dialogue Control
      Dialog Enhancement
      Dialog Level Adjustment DTS:X only
      Dialog normalization
      Dialogue Lift
      Sound Retriever Advanced (2-Channel)
      Sound Retriever AIR
      Digital noise Reduction
      Tone Control Front L/R Channels Front L/R Channels
      Compressed Music Enhancer Advanced Music Optimizer (bluetooth included) Advanced Sound Retriever
      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 for Deep Bass and Clear Mid-Range
      Direct Mode
      Pure Audio Mode
      Pure Direct Analog Path Mode
      Pure Direct Mode
      Auto Surround
      Optimum Surround
      Advanced Surround11 + 1
      Wide Surround
      Front Stage Surround Advance
      Headphone Surround
      Virtual Speakers T-D (Theater-Dimensional)
      Virtual Depth
      Independent Subwoofer Outputs
      CALIBRATION Onkyo TX-NR646 Pioneer VSX-824-K
      Auto Speaker Calibration System with Mic. AccuEQ Advance MCACC Auto
      Manual MCACC
      MCACC Memory1
      Phase Control
      Auto Phase Control Plus
      Full Band Phase Control
      Standing Wave Control
      EQ Bands5-Band
      Symmetric EQ
      X-Curve
      Distance Adjustment0.1 Feet
      Precision Distance
      Polarity Check
      Auto Subwoofer Crossover
      VIDEO FEATURES Onkyo TX-NR646 Pioneer VSX-824-K
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.2 (3 inputs / 2 outputs)
      QMS (Quick Media Switching)
      ALLM (Auto Low Latency Mode)
      VRR (Variable Refresh Rate)
      QFT (Quick Frame transport)
      3-D Ready
      Video Signal Passthroughup to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)up to 4K/60p (4:4:4 24-bit)
      4K/60p (4:2:2 36-bit)
      4K/24p (4:4:4 36-bit)
      Video Signal Upscaling
      Analog To HDMI Upconversion Component**, Composite
      Component Video Upscaling
      Analog to Analog Video conversion
      Component Video Maximum Resolution480i/576i
      Stream Smoother
      Pure Cinema
      Video Parameter Adjustments
      Triple HD noise Reduction
      Super Resolution
      isf Certified Calibration Control
      CONNECTIVITY Onkyo TX-NR646 Pioneer VSX-824-K
      Wi-Fi via optional AS-WL300 adapter (sold separately)
      Bluetooth via optional AS-BT100 or AS-BT200 adapters (sold separately)
      Works with Amazon Alexa
      Chromecast Built-In
      Works with SonoS
      DTS Play-Fi
      MHL Input 1 Rear (Version 2.0)
      DLNA 1.5
      AirPlay AirPlay AirPlay
      Apple Product Connection iPod, iPhone and iPad iPod and iPhone via front USB
      Remote AppOnkyo Remote App for iPod touch/iPhone and Android-Powered Devices iControlAV5 (for iOS and Android)
      InstaPrevue Input Source Prevue
      TERMINALS Onkyo TX-NR646 Pioneer VSX-824-K
      HDMI Inputs8 (1 front)6 (1 front)
      HDMI Outputs2 (simultaneous)1
      8K Inputs
      USB Input1 (Rear)1 Front
      USB DC Out Port1 Rear for AS-WL300 (5 V, 0.6 A)
      Optical Inputs21
      Optical Outputs
      Coaxial Inputs11
      RCA Line Inputs73
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs32
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs2
      Component Video Outputs
      Ethernet
      Ethernet Switch
      PC In
      Front A/V InputsHDMIHDMI, USB
      Speaker A/B
      Headphone Out6.3 mm (1/4")6.3 mm (1/4")
      Detachable Power Cord
      uport
      adapterport
      ZONES Onkyo TX-NR646 Pioneer VSX-824-K
      Number of Zones21
      Powered Zones 2
      Zone 2 OutsRCA Line Out
      Whole House Mode
      RS-232C Interface
      +12V Trigger Output0
      Remote (IR) Input/Output0 / 00 / 0
      MISCELLANEOUS Onkyo TX-NR646 Pioneer VSX-824-K
      On-Screen Display Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-UpNetwork GUI / Set-Up Text - HDMI Only
      AV Navigator
      IP Control
      PreAmp Mode
      Versatile Speaker Configuration
      FL Dimmer
      Function Rename
      Remote ControllerSystem Remote Control
      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
      RADIO Onkyo TX-NR646 Pioneer VSX-824-K
      Analog Tuner FM/AM with RDS FM/AM
      Presets4030
      Digital Radio
      Internet Radio TuneIn vTuner
      Pandora
      Spotify
      Tidal
      Deezer
      Napster
      SiriusXM
      CONSTRUCTION Onkyo TX-NR646 Pioneer VSX-824-K
      Front PanelBrushed
      Solid Aluminum Front
      Speaker Terminals95
      Large Speaker Terminals95
      Color-Coded Speaker Terminals
      Transparent High-Grade Speaker Terminals
      3D Space Frame Construction
      Gold plated RCA terminals
      POWER Onkyo TX-NR646 Pioneer VSX-824-K
      Power SupplyAC 220-240 V, 50/60 HzAC 120 V, 60 Hz
      Independent Power Supply2
      H.C.P.S. (High Current Power Supply) Massive High Power Transformer
      Toroidal Transformer
      Low Leakage Flux Power Transformer
      Transformer Stabilizer
      Power Consumption630 W450 W
      No Sound Power70 W
      Standby Power0.15 W0.1 W
      Capacitor Bank8,200 µF
      ECO Mode / Hybrid Standby Function
      Auto Power Standby
      PHYSICAL Onkyo TX-NR646 Pioneer VSX-824-K
      Dimensions (W x H x D)435 mm x 173.5 mm x 329 mm
      17-1/8" x 6-13/16" x 12-15/16"      		435 mm x 168 mm x 331.5 mm
      17-3/16" x 6-5/8" x 13-1/16"
      Weight9.8 kg (21.6 lbs)8.6 kg (18 lb 16 oz)
      SPECIFICATIONS Onkyo TX-NR646 Pioneer VSX-824-K
      Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)100 W (0.08% THD)80 W (0.08% THD)
      Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)170 W (0.9% THD)140 W (1% THD)
      Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)175 W
      Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)160 W (1% THD)
      Dynamic Power per Channel (3 Ω, Front)240 W
      Dynamic Power per Channel (4 Ω, Front)210 W
      Dynamic Power per Channel (8 Ω, Front)120 W
      THD0.08% (20 Hz - 20 kHz, Half power)
      Damping Factor60 (Front, 1 kHz, 8 Ω)
      Input Sensitivity and Impedance (Line)200 mV/47 kΩ (Line)200 mV/47 kΩ (Line)
      Input Sensitivity and Impedance (Phono MM)3.5 mV/47 kΩ (Phono mm)
      Phono Overload70 mV (MM, 1 kHz 0.5% Direct)
      S/N Ratio (Line, IHF-A)100 dB98 dB
      S/N Ratio (Line, EIA, at 1 W (1 kHz))79 dB
      S/N Ratio (Phono MM, IHF-A)80 dB
      Frequency Response (Analog In)10 Hz - 100 kHz/+1 dB, -3 dB (Direct mode)
      DSD Sampling Rates via HDMI2.8 MHz, 5.6 MHz2.8 MHz
      DSD Sampling Rates via USB2.8 MHz, 5.6 MHz2.8 MHz
      Video Input Sensitivity/Output Level and Impedance 1 Vp-p/75 Ω (Component Y)
      0.7 Vp-p/75 Ω (Component PB/CB, PR/CR)
      1 Vp-p/75 Ω (Composite)      		1 Vp-p/75 Ω (Composite)
      Video Frequency Response5 Hz - 100 MHz/+0 dB, -3 dB (Component)
      Ethernet Standard10BASE-T/100BASE-TX10BASE-T/100BASE-TX
      Wi-Fi StandardIEEE 802.11 b/g/n
      Wi-Fi Terminal Frequency2.4 GHz
      Bluetooth Version2․1 + EDR
      Bluetooth Frequency2.4 GHz
      HDMI TerminalType A (19-pin)
      HDMI Output Type5 V, 100 mA
      HDMI Input/MHL Terminal5 V, 900 mA
      USB Terminal5 V, 1 AUSB2.0 (Type A) 5 V, 1 A
      FM Frequency87.5 MHz - 108.0 MHz87.5 MHz - 108 MHz
      AM Frequency522/530 kHz - 1611/1710 kHz530 kHz - 1700 kHz
      Warranty2 Years1 Year

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

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