Onkyo TX-SR494 vs Onkyo TX-NR636

      Onkyo TX-SR494

      Onkyo TX-NR636
      81
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      79
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      North America
      Europe Australia and Asia
      USA
      Taiwan Europe Australia and Asia Others
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      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
      • Bluetooth

      Highlights

      • 7.2 Channels
      • 7.1 Channel Processing
      • 95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      • Dolby Atmos
      • 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 Onkyo TX-SR494
      4. Advantage of Onkyo TX-NR636
      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-SR494 to Onkyo TX-NR636 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 7 channel amplifiers with Onkyo TX-SR494's being more powerful.


      Onkyo TX-SR494 Onkyo TX-NR636

      Onkyo TX-SR494 was introduced in 2019. 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.

      Onkyo TX-NR636 was introduced in 2014. It is equipped with 7 channel amplifier with 95 W (8 Ω, 20 Hz - 20 kHz and 2 channel driven) power per channel and is capable of 7.1 maximum channel processing. It supports Dolby Atmos, passes 4K/60Hz and upscales up to 4K/30p (Marvell Qdeo) video signal.

      We evaluated Onkyo TX-SR494 and Onkyo TX-NR636 and gave them scores of 81 and 79 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-SR494

      Onkyo TX-NR636

      Amplifier
      84
      Amplifier
      81
      Audio Features
      85
      Audio Features
      81
      Video Features
      95
      Video Features
      71
      Connectivity
      60
      Connectivity
      83
      Zones
      78
      Zones
      77
      Radio
      59
      Radio
      90
      OVERALL
      81
      OVERALL
      79

      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-SR494 and Onkyo TX-NR636.

      PROS

      Onkyo TX-SR494

      Onkyo TX-NR636

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

      CONS

      Onkyo TX-SR494

      Onkyo TX-NR636

      •   Low Power Output - 80 W
      •   No Front Wide Channel Support
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No HDR10+
      •   No eARC
      •   No 8K Passthrough
      •   No Wi-Fi
      •   Does not Work with Amazon Alexa
      •   4 HDMI Inputs
      •   1 HDMI Outputs
      •   0 8K Input
      •   No USB Input
      •   Few RCA Line Inputs
      •   No Phono Input
      •   No RCA Pre-Outs
      •   No Composite Video Inputs
      •   No Ethernet
      •   No Digital Radio
      •   No Pandora
      •   No Spotify
      •   No Tidal
      •   No Front Wide Channel Support
      •   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
      •   0 8K Input
      •   No RCA Pre-Outs
      •   No Digital Radio
      •   No Tidal
      •   Bluetooth 2․1 + EDR


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

      AVERAGE

      Onkyo TX-SR494

      Onkyo TX-NR636

      •   7.2 Channels
      •   7.1 Channel Processing
      •   2 Zones
      •   Bluetooth 4․2
      •   7.2 Channels
      •   Power Output - 95 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   2 Zones

      3. Advantage of Onkyo TX-SR494

      This section shows those features and specifications which are the reason to choose Onkyo TX-SR494 over Onkyo TX-NR636.

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      Onkyo TX-SR494
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      Onkyo TX-SR494 vs Onkyo TX-NR636
      Certified 4 Ω Performance vs
      Higher DAC Specs 384 kHz/32 Bit vs 192 kHz/24 Bit
      Dolby Atmos Height Virtualization vs
      DTS:X vs
      DTS Neural:X vs
      DTS Virtual:X vs
      DTS Dialog Control vs
      Dialog Normalization vs
      HDR10 vs
      BT.2020 color space vs
      Dolby Vision vs
      HLG vs
      Newer HDCP Version 2.3 vs 2.2
      USB DC Out Port vs
      Zone 2 Outs Zone B Pre/Line Out vs RCA Line Out
      Higher Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC) 100 W (0.08% THD) vs 95 W (0.08% THD)
      Higher S/N Ratio (Line, IHF-A) 109 db vs 106 dB
      Newer Bluetooth Version 4․2 vs 2․1 + EDR

      4. Advantage of Onkyo TX-NR636

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR636 over Onkyo TX-SR494.

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      Onkyo TX-NR636
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      Onkyo TX-SR494 vs Onkyo TX-NR636
      Higher Power Output 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) vs 95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Optimum Gain Volume Circuitry vs
      DTS Neo vs Neo:6
      Music Playback via USB vs FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TruHD
      Higher Resolution Music Playback via USB vs up to 96 kHz
      DSD via HDMI 2-ch vs 2-ch/Multi-ch Input
      DSD via USB vs 2-ch Input
      Jitter Reduction vs PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
      Phase-Matching Bass Boost vs for Deep Bass and Clear Mid-Range
      Analog To HDMI Upconversion vs Component**, Composite
      Wi-Fi vs
      MHL Input vs Front HDMI
      AirPlay vs AirPlay via optional Onkyo RI Dock DS-A5 (sold separately)
      Remote Controll App vs Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices
      InstaPrevue Input Source Prevue vs
      More HDMI Inputs 4 vs 7 (1 front)
      More HDMI Outputs 1 vs 2 (simultaneous)
      USB Input vs 1 (Front)
      More Coaxial Inputs/Outputs 1 vs 2
      More RCA Line Inputs 3 vs 6
      Phono Input vs
      More Composite Video Inputs vs 3
      More Composite Video Outputs vs 1
      More Component Video Inputs vs 1
      More Component Video Outputs vs 1
      Ethernet vs
      Front A/V Inputs vs HDMI/MHL, USB
      ONKYO-RI System Control vs
      Internet Radio vs TuneIn
      Pandora vs
      Spotify vs
      SiriusXM vs
      More Speaker Terminals 7 vs 9
      More Large Speaker Terminals 2 vs 9
      Color-Coded Speaker Terminals vs
      Independent Power Supply vs 2
      H.C.P.S. (High Current Power Supply) vs Massive High Power Transformer
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA) 160 W (10% THD) vs 175 W
      Higher DSD Sampling Rate via HDMI 2.8 MHz vs 2.8 MHz, 5.6 MHz
      Wider AM Frequency Range 530 kHz - 1710 kHz vs 522/530 kHz - 1611/1710 kHz

      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-SR494 Onkyo TX-NR636
        Dolby Atmos
        DSD via HDMI 2-ch 2-ch/Multi-ch Input
        Auto Speaker Calibration System with Mic. AccuEQ AccuEQ
        New HDCP Version2.32.2
        Bluetooth SBC, AAC
        Analog Tuner FM/AM FM/AM
      WEAKNESSES Onkyo TX-SR494 Onkyo TX-NR636
        No Front Wide Channel Support
        No IMAX Enhanced
        No Auro 3D with Auro-Matic Upmixer
        No HDR10+
        No eARC
        No 8K Passthroughup to 4K/60p (RGB/YCbCr4:4:4)up to 4K/60p (YCbCr 4:2:0)
        Does not Work with Amazon Alexa
        Few 8K Inputs
        No RCA Pre-Outs0.20.2
        No Digital Radio
        No Tidal

      6. Amplifier

      Onkyo TX-SR494 Onkyo TX-NR636

      7 channel Amplifier: Onkyo TX-SR494 features 7 channel power amplifier. It is rated at 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

      7 channel Amplifier: Onkyo TX-NR636 features 7 channel power amplifier. It is rated at 95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven).
      • WRAT (Wide Range Amp Technology): Onkyo TX-NR636 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-SR494 Onkyo TX-NR636
      Channels7.27.2
      Power Output80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      VLSC (Vector Linear Shaping Circuitry)
      Optimum Gain Volume Circuitry
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Discrete Output Stage Circuitry
      Independent Block Construction (Amp/Preprocessor)
      Bi-amp Capability
      BTL (Bridged Transless or Bridging)

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      Onkyo TX-SR494
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      7. Speaker Configurations

      Onkyo TX-SR494's and Onkyo TX-NR636's amplifiers can be assigned for different speaker configurations.

      • Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
      • Onkyo TX-SR494: 5.2.2 with internal amplifier.
      • Onkyo TX-NR636: 5.2.2 with internal amplifier.
      • DTS:X Configurations: The following speaker configurations are supported for DTS:X:
      • Onkyo TX-SR494: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier.
      • Onkyo TX-NR636: Not supported.
      • Configurations without height channels: There are also other speaker configurations available which do not include height channels:
      • Onkyo TX-SR494: 5.2, 7.2 with internal amplifier.
      • Onkyo TX-NR636: 5.2, 7.2 with internal amplifier.
      • 2-ch Bi-Amp: Both models are 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-SR494 and Onkyo TX-NR636 support Dolby Atmos.

      • Dolby Surround Upmixer: Both models support 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.
      • Dolby Atmos Height Virtualization: Onkyo TX-SR494 supports Dolby Atmos Height Virtualization which is a digital signal processing solution that leverages Dolby's deep understanding of human audio perception to create the sensation of overhead sound from the listener-level speakers.

      DTS:X

      Onkyo TX-SR494 supports DTS:X.

      • DTS Neural:X: Onkyo TX-SR494 supports 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 Virtual:X: Onkyo TX-SR494 supports DTS Virtual:X which bridges the gap between DTS:X codec and the reality of so many consumers' homes, allowing you to enjoy multi-dimensional sound regardless of room size, layout, or speaker configuration. If you have a limited speaker setup you will miss a full immersive potential of your entertainment system. DTS Virtual:X adds height and surround audio effect to your system without adding height speakers. It works with multiple configurations and delivers immersive sound experience out of 5.1 or even 2.1 speaker layouts.
      • DTS Dialog Control: Onkyo TX-SR494 supports 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-SR494 Onkyo TX-NR636
      Dolby Atmos
      Dolby Atmos Height Virtualization
      Dolby Atmos Music
      Dolby TrueHD
      Dolby Digital Plus
      Dolby Surround Upmixer
      Dolby Pro Logic
      DTS:X
      DTS Neural:X
      DTS Virtual:X
      DTS Neo Neo:6
      DTS-HD Master Audio
      DTS-HD High Resolution Audio
      DTS 96/24
      DTS Express
      DTS-ES Discrete 6.1, Matrix 6.1
      IMAX Enhanced
      Auro 3D with Auro-Matic Upmixer

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      Onkyo TX-NR636
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      9. HDMI

      Onkyo TX-SR494 comes with 4 HDMI inputs. It has 1 output.

      Onkyo TX-NR636 comes with 7 HDMI inputs. It has 2 outputs which work parallelly and output the same signal.

      • 4K/60Hz Passthrough: On both receivers all inputs pass up to 4K/60p (RGB/YCbCr4:4:4) video signal.
      • 4K Upscaling: Both receivers can upscale 1080p to 4K from HDMI sources. Onkyo TX-NR636 can also upscale from analog sources.
      • Analog To HDMI Upconversion: Onkyo TX-NR636 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 Onkyo TX-SR494 only).
      • HDCP Copy Protection: Onkyo TX-SR494 is HDCP 2.3 and Onkyo TX-NR636 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-SR494 supports HDR10, Dolby Vision and Hybrid Log-Gamma.

      Onkyo TX-NR636 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-SR494 Onkyo TX-NR636
      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
      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)up to 4K/60p (YCbCr 4:2:0)
      Video Signal Upscaling 1080p to 4K up to 4K/30p (Marvell Qdeo)

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      Onkyo TX-SR494
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      10. Inputs and Outputs

      Audio

      • Phono Input: There is an MM phono input on Onkyo TX-NR636 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 Onkyo TX-SR494 and 6 pair of line inputs on Onkyo TX-NR636 for connecting sources with analog outputs.
      • Digital Inputs: 1 optical input and 1 coaxial input are available on Onkyo TX-SR494 and 1 optical input and 2 coaxial inputs are available on Onkyo TX-NR636 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-SR494
        Inputs:         4   Outputs: 1
        8K Inputs: 0.
      • Onkyo TX-NR636
        Inputs:         7 (1 front)   Outputs: 2 (simultaneous)
        8K Inputs: 0.
      • Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
      • Onkyo TX-SR494
        Inputs:         0   Outputs: 0.
      • Onkyo TX-NR636
        Inputs:         3   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. resolution on Component video connectors.
      • Onkyo TX-NR636 supports up to 1080p resolution on Component video connectors.
      • Onkyo TX-SR494
        Inputs:         0   Outputs: 0.
      • Onkyo TX-NR636
        Inputs:         1   Outputs: 1.

      Front A/V Inputs

      • Onkyo TX-SR494: None
      • Onkyo TX-NR636: HDMI/MHL, USB

      Onkyo TX-SR494

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      Onkyo TX-NR636

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      TERMINALS Onkyo TX-SR494 Onkyo TX-NR636
      HDMI Inputs47 (1 front)
      HDMI Outputs12 (simultaneous)
      8K Inputs
      USB Input1 (Front)
      USB DC Out Port
      Optical Inputs11
      Optical Outputs
      Coaxial Inputs12
      RCA Line Inputs36
      RCA Line Outputs
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs3
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs1
      Component Video Outputs1

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      Onkyo TX-NR636
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      11. Evaluations

      We evaluated Onkyo TX-SR494 and Onkyo TX-NR636 and gave them scores of 81 and 79 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-SR494

      Onkyo TX-NR636

      OVERALL
      81
      OVERALL
      79

      Amplifier

      GOOD
      84
      •   7.2 Channels
      •   Low Power Output - 80 W
      GOOD
      81
      •   7.2 Channels
      •   Power Output - 95 W
      •   Independent Power Supply

      Audio Features

      EXCELLENT
      85
      •   7.2 Channels
      •   No Front Wide Channel Support
      •   7.1 Channel Processing
      •   Dolby Atmos
      •   Dolby Atmos Height Virtualization
      •   DTS:X
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   DSD via HDMI
      GOOD
      81
      •   7.2 Channels
      •   No Front Wide Channel Support
      •   7.1 Channel Processing
      •   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

      EXCELLENT
      95
      •   HDR10
      •   No HDR10+
      •   Dolby Vision
      •   No 8K Passthrough
      GOOD
      71
      •   No HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion

      Connectivity

      AVERAGE
      60
      •   No eARC
      •   New HDCP Version
      •   No Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   4 HDMI Inputs
      •   1 HDMI Outputs
      •   0 8K Input
      •   No USB Input
      •   Few RCA Line Inputs
      •   No Phono Input
      •   No RCA Pre-Outs
      •   No Composite Video Inputs
      •   No Ethernet
      •   Bluetooth 4․2
      GOOD
      83
      •   No eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   7 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

      Zones

      GOOD
      78
      •   2 Zones
      GOOD
      77
      •   2 Zones

      Radio

      AVERAGE
      59
      •   Analog Tuner
      •   No Pandora
      •   No Spotify
      •   No Tidal
      EXCELLENT
      90
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal

      12. Specifications

      GENERAL Onkyo TX-SR494 Onkyo TX-NR636
      BrandOnkyoOnkyo
      ModelTX-SR494TX-NR636
      TypeA/V ReceiverA/V Receiver
      CountryNorth AmericaUSA
      Release Year20192014
      PredecessorOnkyo TX-NR626
      SuccessorOnkyo TX-NR646
      AMPLIFIER Onkyo TX-SR494 Onkyo TX-NR636
      Channels7.27.2
      Power Output80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      Dynamic Audio Amplification
      Non-Phase Shift Amplifier
      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 Front & Center Channels
      PUSH-PULL Design
      Independent Block Construction (Amp/Preprocessor)
      Bi-amp Capability
      BTL (Bridged Transless or Bridging)
      AUDIO FEATURES Onkyo TX-SR494 Onkyo TX-NR636
      Digital Signal Processing (DSP) Engine32-bit Digital Signal Processing EnginesDual 32-bit DSP for Powerful Advanced Processing
      DACAKMBurr-Brown
      DAC Specs384 kHz/32 Bit192 kHz/24 Bit
      Maximum Channel Processing7.17.1
      Air Studios Monitor Certification
      Dolby Atmos
      Dolby Atmos Height Virtualization
      Dolby Atmos Music
      Dolby TrueHD
      Dolby Digital Plus
      Dolby Surround Upmixer
      Dolby Pro Logic
      Dolby Digital EX
      THX Listening Modes
      Surround EX also known as Dolby Digital Surround EX
      DTS:X
      DTS Neural:X
      DTS Virtual:X
      DTS Neo Neo:6
      DTS-HD Master Audio
      DTS-HD High Resolution Audio
      DTS 96/24
      DTS Express
      DTS-ES Discrete 6.1, Matrix 6.1
      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 TruHD
      High Resolution Music Playback via USB and/or Network up to 96 kHz
      High Resolution Audio Formats via USBFLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
      Gapless Playback
      DSD via HDMI 2-ch 2-ch/Multi-ch Input
      DSD via USB 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 Front L/R Channels
      Compressed Music Enhancer Advanced Music Optimizer 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 for Deep Bass and Clear Mid-Range
      Direct Mode
      Pure Audio Mode
      Pure Direct Analog Path Mode
      Virtual Speakers T-D (Theater-Dimensional) T-D (Theater-Dimensional)
      Independent Subwoofer Outputs
      CALIBRATION Onkyo TX-SR494 Onkyo TX-NR636
      Auto Speaker Calibration System with Mic. AccuEQ AccuEQ
      VIDEO FEATURES Onkyo TX-SR494 Onkyo TX-NR636
      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
      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)up to 4K/60p (YCbCr 4:2:0)
      Video Signal Upscaling 1080p to 4K up to 4K/30p (Marvell Qdeo)
      Analog To HDMI Upconversion Component**, Composite
      Component Video Upscaling
      Analog to Analog Video conversion
      Component Video Maximum Resolution1080p
      isf Certified Calibration Control
      CONNECTIVITY Onkyo TX-SR494 Onkyo TX-NR636
      Wi-Fi
      Bluetooth SBC, AAC
      Works with Amazon Alexa
      Chromecast Built-In
      Works with SonoS
      DTS Play-Fi
      MHL Input Front HDMI
      DLNA 1.5
      AirPlay AirPlay via optional Onkyo RI Dock DS-A5 (sold separately)
      Apple Product Connection iPod and iPhone via optional Onkyo RI Dock DS-A5 (sold separately)
      Remote AppOnkyo Remote App for iPod touch/iPhone and Android-Powered Devices
      InstaPrevue Input Source Prevue
      TERMINALS Onkyo TX-SR494 Onkyo TX-NR636
      HDMI Inputs47 (1 front)
      HDMI Outputs12 (simultaneous)
      8K Inputs
      USB Input1 (Front)
      USB DC Out Port
      Optical Inputs11
      Optical Outputs
      Coaxial Inputs12
      RCA Line Inputs36
      RCA Line Outputs
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs3
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs1
      Component Video Outputs1
      Ethernet
      Ethernet Switch
      PC In
      Front A/V InputsHDMI/MHL, USB
      Speaker A/B
      Headphone Out6.3 mm (1/4")6.3 mm (1/4")
      Detachable Power Cord
      uport
      ZONES Onkyo TX-SR494 Onkyo TX-NR636
      Number of Zones22
      Powered Zones 2 2
      Zone 2 OutsZone B Pre/Line OutRCA Line Out
      Whole House Mode
      RS-232C Interface
      +12V Trigger Output00
      Remote (IR) Input/Output0 / 00 / 0
      MISCELLANEOUS Onkyo TX-SR494 Onkyo TX-NR636
      On-Screen Display Advanced "Home" GUI
      GUI Languages7
      ONKYO-RI System Control
      RIHD (Remote Interactive Over HDMI)
      Pre-Pro/Learning Remote /
      On Screen Remote Programming
      Bi-directional Remote Setup via GUI
      Activity Based Remote
      Smart Grid-Ready
      RADIO Onkyo TX-SR494 Onkyo TX-NR636
      Analog Tuner FM/AM FM/AM
      Presets4040
      Digital Radio
      Internet Radio TuneIn
      Pandora
      Spotify
      Tidal
      Deezer
      Napster
      SiriusXM
      CONSTRUCTION Onkyo TX-SR494 Onkyo TX-NR636
      Solid Aluminum Front
      Speaker Terminals79
      Large Speaker Terminals29
      Color-Coded Speaker Terminals
      Transparent High-Grade Speaker Terminals
      Gold plated RCA terminals
      POWER Onkyo TX-SR494 Onkyo TX-NR636
      Power SupplyAC 120 V, 60 HzAC 120 V, 60 Hz
      Independent Power Supply2
      H.C.P.S. (High Current Power Supply) Massive High Power Transformer
      Toroidal Transformer
      Power Consumption490 W6.3 A
      No Sound Power80 W
      Standby Power0.1 W0.1 W
      Capacitor Bank8,200 µF
      ECO Mode / Hybrid Standby Function
      PHYSICAL Onkyo TX-SR494 Onkyo TX-NR636
      Dimensions (W x H x D)435 mm x 160 mm x 328 mm
      17-1/8" x 6-5/16" x 12-15/16"      		435 mm x 173.5 mm x 329 mm
      17-1/8" x 6-13/16" x 12-15/16"
      Dimensions of Package (W x H x D)525 mm x 240 mm x 405 mm
      20-11/16" x 9-7/16" x 15-15/16"
      Weight8.2 kg (18.1 lb 10 oz)10.0 kg (22.0 lbs)
      Weight of Package10.5 kg (23.1 lbs)
      SPECIFICATIONS Onkyo TX-SR494 Onkyo TX-NR636
      Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)100 W (0.08% THD)95 W (0.08% THD)
      Power Output (6 Ω, 20 Hz - 20 kHz, 1 channel driven, JEITA)130 W (0.08% THD)
      Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)115 W (0.7% THD)
      Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)160 W (10% THD)175 W
      Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)165 W (0.9% 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)0.08% (20 Hz - 20 kHz, Half power)
      Damping Factor60 (Front, 1 kHz, 8 Ω)
      Input Sensitivity and Impedance (Line)200 mV/47 kΩ (1 kHz, 100 W/8 Ω)200 mV/47 kΩ (Line)
      Input Sensitivity and Impedance (Phono MM)2.5 mV/47 kΩ
      Rated Lineout Level and Impedance200 mV/2.2 kΩ
      Maximum Lineout Level and Impedance2 V/2.2 kΩ
      Rated Headphone Power Output80 mW (32 Ω, 1 kHz, 10% THD)
      Phono Overload70 mV (MM, 1kHz, 0.5% Direct)
      S/N Ratio (Line, IHF-A)109 db106 dB
      S/N Ratio (Phono MM, IHF-A)80 dB
      Frequency Response (Analog In)10 Hz - 100 kHz/+1 dB, -3 dB (Direct)5 Hz - 100 kHz/+1 dB, -3 dB (Direct Mode)
      DSD Sampling Rates via HDMI2.8 MHz2.8 MHz, 5.6 MHz
      DSD Sampling Rates via USB2.8 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)
      Video Frequency Response5 Hz - 100 MHz/+0 dB, -3 dB (Component)
      Ethernet Standard10BASE-T/100BASE-TX
      Wi-Fi StandardIEEE 802.11 b/g/n
      Wi-Fi Terminal Frequency2.4 GHz
      Bluetooth Version4․22․1 + EDR
      Bluetooth Frequency2.4 GHz2.4 GHz
      USB Terminal5 V, 1 A
      FM Frequency87.5 MHz - 107.9 MHz87.5 MHz - 107.9 MHz
      FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)Mono: 1.0 µV (11.2 dBf)
      AM Frequency530 kHz - 1710 kHz522/530 kHz - 1611/1710 kHz
      Warranty2 Years2 Years

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

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