Onkyo TX-NR646 vs Pioneer SC-LX901

      Onkyo TX-NR646

      Pioneer SC-LX901
      82
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      91
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      USA
      Taiwan
      Europe, Australia and Asia Others
      North America Europe Australia
      Asia
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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

      • 11.2 Channels
      • 11.2 Channel Processing
      • 140 W (8 Ω, 1 kHz, 2 channel driven)
      • Dolby Atmos, DTS:X
      • HDR10, Dolby Vision
      • 4K/60Hz Passthrough, 4K/60Hz 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-NR646
      4. Advantage of Pioneer SC-LX901
      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 SC-LX901 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 SC-LX901 has 11 channel amplifiers with Onkyo TX-NR646's being less powerful..


      Onkyo TX-NR646 Pioneer SC-LX901

      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 SC-LX901 was introduced in 2017 and represented a flagship model of a manufacturer. It is equipped with 11 channel amplifier with 140 W (8 Ω, 1 kHz, 2 channel driven) power per channel and is capable of 11.2 maximum channel processing. It supports Dolby Atmos and DTS:X, passes 4K/60Hz and upscales up to 4K/60p (YCbCr 4:4:4) video signal.

      We evaluated Onkyo TX-NR646 and Pioneer SC-LX901 and gave them scores of 82 and 91 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 SC-LX901

      Amplifier
      81
      Amplifier
      94
      Audio Features
      84
      Audio Features
      89
      Video Features
      80
      Video Features
      93
      Connectivity
      83
      Connectivity
      88
      Zones
      77
      Zones
      92
      Radio
      89
      Radio
      90
      OVERALL
      82
      OVERALL
      91

      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 SC-LX901.

      PROS

      Onkyo TX-NR646

      Pioneer SC-LX901

      •   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
      •   Many Channels - 11.2
      •   High Power Output - 140 W
      •   11.2 Channel Processing
      •   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
      •   8 HDMI Inputs
      •   USB Input
      •   Many RCA Line Inputs
      •   Phono Input
      •   RCA Pre-Outs
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   3 Zones
      •   Analog Tuner
      •   Spotify
      •   Tidal
      •   Low Leakage Flux Power Transformer

      CONS

      Onkyo TX-NR646

      Pioneer SC-LX901

      •   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
      •   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
      •   0 8K Input
      •   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

      Onkyo TX-NR646

      Pioneer SC-LX901

      •   7.2 Channels
      •   Power Output - 100 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   2 Zones
      •   3 HDMI Outputs
      •   Bluetooth 4․1 + LE

      3. Advantage of Onkyo TX-NR646

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR646 over Pioneer SC-LX901.

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      Onkyo TX-NR646
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      Onkyo TX-NR646 vs Pioneer SC-LX901
      Higher DAC Specs 384 kHz/32 Bit vs 192 kHz/32 Bit
      DTS Neo Neo:6 until firmware update 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, Dolby TrueHD
      Virtual Speakers T-D (Theater-Dimensional) vs
      DLNA 1.5 vs
      InstaPrevue Input Source Prevue vs
      More RCA Line Inputs 7 vs 6
      More RCA Line Outputs 1 vs
      More Composite Video Inputs 3 vs 2
      Pandora vs
      Higher DSD Sampling Rate via HDMI 2.8 MHz, 5.6 MHz vs 2.8 MHz

      4. Advantage of Pioneer SC-LX901

      This section shows those features and specifications which are the reason to choose Pioneer SC-LX901 over Onkyo TX-NR646.

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      Pioneer SC-LX901
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      Onkyo TX-NR646 vs Pioneer SC-LX901
      More Channels 7.2 vs 11.2
      Higher Power Output 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) vs 140 W (8 Ω, 1 kHz, 2 channel driven)
      Certified 4 Ω Performance vs
      Bi-amp capability vs Front, Center, Surround, SP-B
      More Channel Processing 7.1 vs 11.2
      Air Studios Monitor Certification vs
      DTS Neural:X after firmware update vs
      Higher Resolution Music Playback via USB up to 96 kHz vs 64, 88.2, 96, 176.4, 192 kHz/24 bit
      High Resolution Audio Formats via USB FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC vs Apple Lossless, WAV, FLAC, AIFF, AAC, DSD, Dolby TrueHD
      Dialog Enhancement vs
      Dialog Normalization vs
      Dialogue Lift vs via Dialog Enhancement
      More Tone Control Channels Front L/R Channels vs All Channels
      Independent Subwoofer Outputs vs
      BT.2020 color space vs
      Dolby Vision vs
      Video Signal Upscaling vs up to 4K/60p (YCbCr 4:4:4)
      Analog To HDMI Upconversion Component**, Composite vs Component**, Composite
      Component Video Maximum Resolution 480i/576i vs 1080i
      Chromecast Built-In vs
      Works with SONOS vs
      DTS Play-Fi vs
      More HDMI Outputs 2 (simultaneous) vs 2 (1 MAIN, 1 SUB/ZONE 2)
      More Optical Inputs 2 vs 3
      More Coaxial Inputs/Outputs 1 vs 2
      More RCA Pre-Outs 0.2 vs 11.2
      More Component Video Outputs vs 1
      Front A/V Inputs HDMI vs HDMI, USB
      Speaker A/B vs
      More Zones 2 vs 3
      More Powered Zones 2 vs 2 and 3
      Zone 2 Outs RCA Line Out vs HDMI, RCA Pre/Line Out
      RS-232C Interface vs
      +12V Trigger Output 0 vs 2 (A: 100 mA, B: 25 mA)
      Remote (IR) Input/Output 0 / 0 vs 2 / 1
      Analog Tuner FM/AM vs FM/AM with RDS
      Tidal vs
      More Speaker Terminals 9 vs 11
      More Large Speaker Terminals 9 vs 11
      Gold plated RCA terminals vs
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, FTC) 170 W (0.9% THD) vs 200 W (1% THD)
      Lower THD 0.08% (20 Hz - 20 kHz, Half power) vs 0.04% (1 kHz, 100 W)
      Higher S/N Ratio (Line, IHF-A) 100 dB vs 108 dB
      Higher S/N Ratio (Phono MM, IHF-A) 80 dB vs 90 dB
      Higher DSD Sampling Rate via USB 2.8 MHz, 5.6 MHz vs 11.2 MHz, 5.6 MHz, 2.8 MHz
      Wi-Fi Standard IEEE 802.11 b/g/n vs IEEE 802.11 a/b/g/n
      Wi-Fi Terminal Frequency 2.4 GHz vs 5 GHz, 2.4 GHz
      Newer Bluetooth Version 2․1 + EDR vs 4․1 + LE
      Longer Warranty 2 Years vs 3 Years Parts & Labor

      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 SC-LX901
        Dolby Atmos up to 5.1.2 after firmware update
        DTS:X up to 5.1.2 after firmware update
        DSD via HDMI 2-ch/Multi-ch Input 2-ch/Multi-ch Input
        Auto Speaker Calibration System with Mic. AccuEQ Advance MCACC Pro
        HDR10
        New HDCP Version2.2 (3 inputs / 2 outputs)2.2
        Analog To HDMI Upconversion Component**, Composite Component**, Composite
        Wi-Fi
        Bluetooth SBC, AAC
        Many HDMI Inputs8 (1 front)8 (1 front)
        USB Input1 (Rear)1 Front
        Many RCA Line Inputs76
        Phono Input
        Composite Video Inputs32
        Component Video Inputs22
        Ethernet
        Analog Tuner FM/AM FM/AM with RDS
        Spotify
      WEAKNESSES Onkyo TX-NR646 Pioneer SC-LX901
        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 Passthroughup to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)up to 4K/60p (YCbCr 4:4:4)
        Does not Work with Amazon Alexa
        Few 8K Inputs
        No Digital Radio

      6. Amplifier

      Onkyo TX-NR646 Pioneer SC-LX901

      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).

      11 channel Class D3 (Direct Energy HD) Amplifier: Pioneer SC-LX901 features 11 channel power amplifier with Class D3 design (Direct Energy HD). It is rated at 140 W (8 Ω, 1 kHz, 2 channel driven) and is able to drive 4 ohm speakers.
      • 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 SC-LX901
      Channels7.211.2
      Power Output100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)140 W (8 Ω, 1 kHz, 2 channel driven)
      Front Wide Channel Support
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Bi-amp Capability Front, Center, Surround, SP-B

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      Onkyo TX-NR646
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      7. Speaker Configurations

      Onkyo TX-NR646's and Pioneer SC-LX901'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 SC-LX901: 5.2.2, 5.2.4, 7.2.2, 7.2.4 with internal amplifier.
      • 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 SC-LX901: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2, 5.2.4, 7.2.2, 7.2.4 with internal amplifier.
      • 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 SC-LX901: 5.2, 7.2 with internal amplifier.
      • Bi-Amp: Onkyo TX-NR646 is able to bi-amp up to 2 and Pioneer SC-LX901 is able to bi-amp up to 4 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 and Pioneer SC-LX901 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.

      DTS:X

      Onkyo TX-NR646 and Pioneer SC-LX901 support DTS:X.

      • DTS Neural:X: Onkyo TX-NR646 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 Dialog Control: Onkyo TX-NR646 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-NR646 Pioneer SC-LX901
      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
      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
      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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      Pioneer SC-LX901
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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 SC-LX901 comes with 8 HDMI inputs. It has 2 outputs - 1 MAIN and 1 SUB/ZONE 2.

      • 4K/60Hz Passthrough: On both receivers all inputs pass up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit) video signal.
      • 4K Upscaling on Pioneer SC-LX901: It can upscale up to 4K/60p (YCbCr 4:4:4) from HDMI sources.
      • 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.
      • 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 Pioneer SC-LX901 only).
      • HDCP 2.2 Copy Protection: Both receivers are 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 SC-LX901 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.



      VIDEO FEATURES Onkyo TX-NR646 Pioneer SC-LX901
      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)2.2
      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/YCbCr4:2:2, 24 bit)up to 4K/60p (YCbCr 4:4:4)
      Video Signal Upscaling up to 4K/60p (YCbCr 4:4:4)

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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 and Pioneer SC-LX901 with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the receiver.
      • Analog Pre-Outs: Pioneer SC-LX901 has 11.2 preamplifier outputs which allows you to connect the receiver to the external power amplifier. You may want to use a high quality external amplifier for certain channels, usually for front L/R and center, and use the receiver to power the rest.
      • Analog Line Inputs and Outputs: There are 7 pair of line inputs on Onkyo TX-NR646 and 6 pair of line inputs on Pioneer SC-LX901 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 3 optical inputs and 2 coaxial inputs are available on Pioneer SC-LX901 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 SC-LX901
        Inputs:         8 (1 front)   Outputs: 2 (1 MAIN, 1 SUB/ZONE 2)
        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 SC-LX901
        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.
      • Onkyo TX-NR646 supports up to 480i/576i resolution on Component video connectors.
      • Pioneer SC-LX901 supports up to 1080i resolution on Component video connectors.
      • Onkyo TX-NR646
        Inputs:         2   Outputs: 0.
      • Pioneer SC-LX901
        Inputs:         2   Outputs: 1.

      Front A/V Inputs

      • Onkyo TX-NR646: HDMI
      • Pioneer SC-LX901: HDMI, USB

      Onkyo TX-NR646

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      Pioneer SC-LX901

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      TERMINALS Onkyo TX-NR646 Pioneer SC-LX901
      HDMI Inputs8 (1 front)8 (1 front)
      HDMI Outputs2 (simultaneous)2 (1 MAIN, 1 SUB/ZONE 2)
      8K Inputs
      USB Input1 (Rear)1 Front
      USB DC Out Port
      Optical Inputs23
      Optical Outputs
      Coaxial Inputs12
      RCA Line Inputs76
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.211.2
      XLR Pre-outs
      Composite Video Inputs32
      Composite Video Outputs
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs22
      Component Video Outputs1

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      Pioneer SC-LX901
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      11. Evaluations

      We evaluated Onkyo TX-NR646 and Pioneer SC-LX901 and gave them scores of 82 and 91 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 SC-LX901

      OVERALL
      82
      OVERALL
      91

      Amplifier

      GOOD
      81
      •   7.2 Channels
      •   Power Output - 100 W
      •   Independent Power Supply
      EXCELLENT
      94
      •   Many Channels - 11.2
      •   High Power Output - 140 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
      EXCELLENT
      89
      •   Many Channels - 11.2
      •   No Front Wide Channel Support
      •   11.2 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

      GOOD
      80
      •   HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion
      EXCELLENT
      93
      •   HDR10
      •   No HDR10+
      •   Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion

      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
      EXCELLENT
      88
      •   No eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   Chromecast Built-In
      •   8 HDMI Inputs
      •   3 HDMI Outputs
      •   0 8K Input
      •   USB Input
      •   Many RCA Line Inputs
      •   Phono Input
      •   RCA Pre-Outs
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Bluetooth 4․1 + LE

      Zones

      GOOD
      77
      •   2 Zones
      EXCELLENT
      92
      •   3 Zones

      Radio

      EXCELLENT
      89
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal
      EXCELLENT
      90
      •   Analog Tuner
      •   No Pandora
      •   Spotify
      •   Tidal

      12. Specifications

      GENERAL Onkyo TX-NR646 Pioneer SC-LX901
      BrandOnkyoPioneer
      SeriesElite
      ModelTX-NR646SC-LX901
      TypeA/V ReceiverA/V Receiver
      CountryTaiwanAsia
      Release Year20152017
      PredecessorOnkyo TX-NR636 Pioneer SC-99
      SuccessorOnkyo TX-NR656 Pioneer SC-LX904
      AMPLIFIER Onkyo TX-NR646 Pioneer SC-LX901
      Channels7.211.2
      Power Output100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)140 W (8 Ω, 1 kHz, 2 channel driven)
      Front Wide Channel Support
      Amplifier DesignClass D3 (Direct Energy HD)
      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 Front, Center, Surround, SP-B
      BTL (Bridged Transless or Bridging)
      AUDIO FEATURES Onkyo TX-NR646 Pioneer SC-LX901
      Digital Signal Processing (DSP) EngineDual 32-bit DSP for Powerful Advanced ProcessingCirrus Logic (Quad Core) x 1
      DACAsahi Kasei AK4458ESS SABRE32 Ultra (ES9016S)
      DAC Specs384 kHz/32 Bit192 kHz/32 Bit
      Maximum Channel Processing7.111.2
      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
      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
      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 TrueHDMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD, Dolby TrueHD
      High Resolution Music Playback via USB and/or Network up to 96 kHz 64, 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, AAC, DSD, Dolby TrueHD
      Gapless Playback
      DSD via HDMI 2-ch/Multi-ch Input 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 PQLS & PQFA
      DTS Dialogue Control
      Dialog Enhancement
      Dialog Level Adjustment DTS:X only
      Dialog normalization
      Dialogue Lift via Dialog Enhancement
      Sound Retriever Advanced
      Sound Retriever AIR
      Digital noise Reduction
      Tone Control Front L/R Channels All 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 SC-LX901
      Auto Speaker Calibration System with Mic. AccuEQ Advance MCACC Pro
      Manual MCACC
      MCACC Memory3
      Reflex Optimizer
      Phase Control
      Auto Phase Control Plus
      Full Band Phase Control
      Standing Wave Control
      EQ Bands9-Band
      Symmetric EQ
      X-Curve
      Distance Adjustment0.5 feet
      Precision Distance
      Polarity Check
      Auto Subwoofer Crossover
      VIDEO FEATURES Onkyo TX-NR646 Pioneer SC-LX901
      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)2.2
      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/YCbCr4:2:2, 24 bit)up to 4K/60p (YCbCr 4:4:4)
      Video Signal Upscaling up to 4K/60p (YCbCr 4:4:4)
      Analog To HDMI Upconversion Component**, Composite Component**, Composite
      Component Video Upscaling
      Analog to Analog Video conversion
      Component Video Maximum Resolution480i/576i1080i
      Stream Smoother
      Pure Cinema
      Video Parameter Adjustments
      Super Resolution
      isf Certified Calibration Control
      CONNECTIVITY Onkyo TX-NR646 Pioneer SC-LX901
      Wi-Fi
      Bluetooth SBC, AAC
      Works with Amazon Alexa
      Chromecast Built-In
      Works with SonoS
      DTS Play-Fi
      MHL Input
      DLNA 1.5
      AirPlay AirPlay AirPlay
      Apple Product Connection iPod, iPhone and iPad Made for iPhone, iPod and iPad (Airplay only)
      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 SC-LX901
      HDMI Inputs8 (1 front)8 (1 front)
      HDMI Outputs2 (simultaneous)2 (1 MAIN, 1 SUB/ZONE 2)
      8K Inputs
      USB Input1 (Rear)1 Front
      USB DC Out Port
      Optical Inputs23
      Optical Outputs
      Coaxial Inputs12
      RCA Line Inputs76
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.211.2
      XLR Pre-outs
      Composite Video Inputs32
      Composite Video Outputs
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs22
      Component Video Outputs1
      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 SC-LX901
      Number of Zones23
      Powered Zones 22 and 3
      Zone 2 OutsRCA Line OutHDMI, RCA Pre/Line Out
      Zone 3 OutsRCA Pre/Line Out
      Whole House Mode
      RS-232C Interface
      +12V Trigger Output02 (A: 100 mA, B: 25 mA)
      Remote (IR) Input/Output0 / 02 / 1
      MISCELLANEOUS Onkyo TX-NR646 Pioneer SC-LX901
      On-Screen Display Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-UpIcon-based Graphical User Interface (GUI)
      GUI Languages9
      AV Navigator
      IP Control
      PreAmp Mode
      Versatile Speaker ConfigurationSurround Back/Height 1/Height 2/Speaker B/Bi-Amp/Zone 2/Zone 3
      FL Dimmer
      Function Rename
      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 SC-LX901
      Analog Tuner FM/AM FM/AM with RDS
      Presets4040
      Digital Radio
      Internet Radio TuneIn TuneIn
      Pandora
      Spotify
      Tidal
      Deezer
      Napster
      SiriusXM
      CONSTRUCTION Onkyo TX-NR646 Pioneer SC-LX901
      Front PanelBrushed
      Solid Aluminum Front
      ConstructionAdvanced Direct Construction
      Speaker Terminals911
      Large Speaker Terminals911
      Color-Coded Speaker Terminals
      Transparent High-Grade Speaker Terminals
      3D Space Frame Construction
      Gold plated RCA terminals
      POWER Onkyo TX-NR646 Pioneer SC-LX901
      Power SupplyAC 120 V, 60 HzAC 220-230/240 V, 50/60 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 Consumption6.4 A340 W
      No Sound Power70 W90 W
      Standby Power0.1 W0.2 W
      Capacitor Bank8,200 µF
      ECO Mode / Hybrid Standby Function
      Auto Power Standby
      Auto Power off
      PHYSICAL Onkyo TX-NR646 Pioneer SC-LX901
      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 185 mm x 441 mm
      17-1/8" x 7-5/16" x 17-1/3"
      Weight9.4 kg (20.7 lbs)18.3 kg (40.3 lbs)
      SPECIFICATIONS Onkyo TX-NR646 Pioneer SC-LX901
      Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)100 W (0.08% THD)
      Power Output (8 Ω, 1 kHz, 2 channel Driven, FTC)140 W (0.08% THD)
      Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)200 W (1.0% THD)
      Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)170 W (0.9% THD)200 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)
      Power Output (4 Ω, 1 kHz, 2 channel Driven)255 W (1.0% THD)
      Rated Power Output (4 Ω, 1 kHz, 1 channel Driven)280 W (1% THD)
      Maximum Power Output (4 Ω, 1 kHz, 1 channel Driven)340 W (10% THD)
      Multi Channel Simultaneous Drive880 W (8 Ω, 1 kHz, 1.0%)
      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)0.04% (1 kHz, 100 W)
      Damping Factor60 (Front, 1 kHz, 8 Ω)
      Input Sensitivity and Impedance (Line)200 mV/47 kΩ (Line)200 mV/82 kΩ
      Input Sensitivity and Impedance (Phono MM)3.5 mV/47 kΩ (Phono mm)3.5 mV/47 kΩ
      Rated Preout Level and Impedance1 V/470 kΩ
      Rated Headphone Jack Output Level and Impedance43 Ω
      Rated Headphone Power Output57 mW (32 Ω, 1 kHz, 10% THD)
      Phono Overload70 mV (MM, 1 kHz 0.5% Direct)70 mV (MM, 1 kHz, 0.5%)
      S/N Ratio (Line, IHF-A)100 dB108 dB
      S/N Ratio (Phono MM, IHF-A)80 dB90 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 MHz11.2 MHz, 5.6 MHz, 2.8 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 (Component Y)
      0.7 Vp-p/75 Ω (Component PB/PR)
      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/nIEEE 802.11 a/b/g/n
      Wi-Fi Terminal Frequency2.4 GHz5 GHz, 2.4 GHz
      Bluetooth Version2․1 + EDR4․1 + LE
      Bluetooth Frequency2.4 GHz2.4 GHz
      HDMI Output Type5 V, 55 mA
      USB Terminal5 V, 1 AUSB2.0 (Type A) 5 V, 1 A
      FM Frequency87.5 MHz - 107.9 MHz87.5 MHz - 108.0 MHz
      AM Frequency522/530 kHz - 1611/1710 kHz522/530 kHz - 1611/1710 kHz
      Warranty2 Years3 Years Parts & Labor

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

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