Anthem MRX 740 8K vs Onkyo TX-NR646

       
       

      Highlights

      • 7.2 Channels
      • 11.1 Channel Processing
      • 140 W (8 Ω, 1 kHz, 2 channel driven)
      • HDMI 2.1
      • Dolby Atmos, DTS:X
      • HDR10, HDR10+, Dolby Vision
      • 8K Passthrough
      • Wi-Fi, Bluetooth, Ethernet
      • Phono Input

      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

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

      1. Overview

      Here we are comparing Anthem MRX 740 8K to Onkyo TX-NR646 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.


      Anthem MRX 740 8K Onkyo TX-NR646

      Anthem MRX 740 8K was introduced in 2021. It is equipped with 7 channel amplifier with 140 W (8 Ω, 1 kHz, 2 channel driven) power per channel and is capable of 11.1 maximum channel processing. It supports Dolby Atmos and DTS:X, passes 8K/60Hz and 4K/120Hz video signal.

      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.


      We evaluated Anthem MRX 740 8K and Onkyo TX-NR646 and gave them scores of 89 and 82 out of 100 recpectively. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

      Anthem MRX 740 8K

      Onkyo TX-NR646

      Amplifier
      89
      Amplifier
      81
      Audio Features
      89
      Audio Features
      84
      Video Features
      100
      Video Features
      80
      Connectivity
      88
      Connectivity
      83
      Zones
      77
      Zones
      77
      Radio
      73
      Radio
      93
      OVERALL
      89
      OVERALL
      82

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

      2. Pros and Cons

      In this section we present pros and cons of Anthem MRX 740 8K and Onkyo TX-NR646.

      PROS

      Anthem MRX 740 8K

      Onkyo TX-NR646

      •   High Power Output - 140 W
      •   11.1 Channel Processing
      •   Dolby Atmos
      •   DTS:X
      •   IMAX Enhanced
      •   Auto Speaker Calibration System with Mic.
      •   HDR10
      •   HDR10+
      •   Dolby Vision
      •   HDMI 2.1
      •   eARC
      •   New HDCP Version
      •   Auto Low Latency Mode Pass-through
      •   VRR
      •   QFT
      •   8K Passthrough
      •   Wi-Fi
      •   Bluetooth
      •   Chromecast Built-In
      •   7 HDMI Inputs
      •   4 HDMI Outputs
      •   7 8K Inputs
      •   Phono Input
      •   RCA Pre-Outs
      •   Ethernet
      •   Analog Tuner
      •   Spotify
      •   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

      CONS

      Anthem MRX 740 8K

      Onkyo TX-NR646

      •   No Front Wide Channel Support
      •   No Dolby Atmos Height Virtualization
      •   No Auro 3D with Auro-Matic Upmixer
      •   No DSD via HDMI
      •   Does not Work with Amazon Alexa
      •   No USB Input
      •   No Composite Video Inputs
      •   No Digital Radio
      •   No Pandora
      •   No Tidal
      •   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


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

      AVERAGE

      Anthem MRX 740 8K

      Onkyo TX-NR646

      •   7.2 Channels
      •   RCA Line Inputs
      •   2 Zones
      •   7.2 Channels
      •   Power Output - 100 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   2 Zones

      3. Advantage of Anthem MRX 740 8K

      This section shows those features and specifications which are the reason to choose Anthem MRX 740 8K over Onkyo TX-NR646.

      Check the Price

      Anthem MRX 740 8K vs Onkyo TX-NR646
      Higher Power Output 140 W (8 Ω, 1 kHz, 2 channel driven) vs 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Certified 4 Ω Performance vs
      Higher DAC Specs 768 kHz/32 Bit vs 384 kHz/32 Bit
      More Channel Processing 11.1 vs 7.1
      DTS Neural:X vs after firmware update
      DTS Virtual:X vs
      IMAX Enhanced vs
      HDR10+ vs
      BT.2020 color space vs
      Dolby Vision vs
      HLG vs
      Enhanced Audio Return Channel (eARC) vs
      Newer HDCP Version 2.3 vs 2.2 (3 inputs / 2 outputs)
      Auto Low Latency Mode Pass-through vs
      VRR vs
      QFT vs
      Video Signal Passthrough up to 8K 50/60Hz and 4K 100/120Hz 4:4:4 vs up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
      Chromecast Built-In vs
      AirPlay AirPlay 2 vs AirPlay
      More HDMI Outputs 3 (2 for MAIN, 1 for ZONE2) vs 2 (simultaneous)
      More 8K Inputs 7 vs
      More Optical Inputs 3 vs 2
      More Optical Outputs 1 vs
      More Coaxial Inputs/Outputs 2 vs 1
      More RCA Pre-Outs 11.2 vs 0.2
      Detachable Power Cord vs
      Zone 2 Outs HDMI, Pre Out vs RCA Line Out
      RS-232C Interface vs
      +12V Trigger Output 3 vs 0
      Remote (IR) Input/Output 1 / 0 vs 0 / 0
      Higher S/N Ratio (Line, IHF-A) 110 dB vs 100 dB
      Check out other receivers which are frequently compared to Anthem MRX 740 8K.

      4. Advantage of Onkyo TX-NR646

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR646 over Anthem MRX 740 8K.

      Check the Price

      Anthem MRX 740 8K vs Onkyo TX-NR646
      DTS Neo vs Neo:6 until firmware update
      DSD via HDMI vs 2-ch/Multi-ch Input
      DSD via USB vs 2-ch Input
      More HDMI Inputs 7 vs 8 (1 front)
      USB Input for factory service vs 1 (Rear)
      More RCA Line Inputs 4 vs 7
      More Composite Video Inputs vs 3
      More Component Video Inputs vs 2
      Front A/V Inputs vs HDMI
      More Powered Zones vs 2
      Pandora vs
      Deezer vs
      SiriusXM vs
      More Speaker Terminals 7 vs 9
      More Large Speaker Terminals 7 vs 9

      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 Anthem MRX 740 8K Onkyo TX-NR646
        Dolby Atmos up to 5.1.2 after firmware update
        DTS:X up to 5.1.2 after firmware update
        Auto Speaker Calibration System with Mic.Anthem Room Correction (ARC Genesis) AccuEQ Advance
        HDR10
        New HDCP Version2.32.2 (3 inputs / 2 outputs)
        Wi-Fi
        Bluetooth
        Many HDMI Inputs78 (1 front)
        Phono Input
        Ethernet
        Analog Tuner FM/AM
        Spotify
      WEAKNESSES Anthem MRX 740 8K Onkyo TX-NR646
        No Front Wide Channel Support
        No Dolby Atmos Height Virtualization
        No Auro 3D with Auro-Matic Upmixer
        Does not Work with Amazon Alexa
        No Digital Radio
        No Tidal

      6. Amplifier

      Anthem MRX 740 8K Onkyo TX-NR646

      7 channel Class A/B Amplifier: Anthem MRX 740 8K features 7 channel power amplifier with Class A/B design on Channels 1-5 and Class D design on the rest. It is rated at 140 W (8 Ω, 1 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

      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).

      • 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 Anthem MRX 740 8K Onkyo TX-NR646
      Channels7.27.2
      Power Output140 W (8 Ω, 1 kHz, 2 channel driven)100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      THX™ Certification
      Continuous 6 Ω Rated
      Certified 4 Ω Performance
      Bi-amp Capability

      Check the Price

      7. Speaker Configurations

      Anthem MRX 740 8K's and Onkyo TX-NR646's amplifiers can be assigned for different speaker configurations.

      • Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
      • Anthem MRX 740 8K: 5.2.2 with internal amplifier and 5.2.4, 7.2.2 with addition of external 2 channel amplifier and 7.2.4 with addition of external 4 channel amplifier.
      • Onkyo TX-NR646: 5.2.2 with internal amplifier.
      • DTS:X Configurations: The following speaker configurations are supported for DTS:X:
      • Anthem MRX 740 8K: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier and 5.2.4, 7.2.2 with addition of external 2 channel amplifier and 7.2.4 with addition of external 4 channel amplifier.
      • Onkyo TX-NR646: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier.
      • Configurations without height channels: There are also other speaker configurations available which do not include height channels:
      • Anthem MRX 740 8K: 5.2, 7.2 with internal amplifier.
      • Onkyo TX-NR646: 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

      Anthem MRX 740 8K and Onkyo TX-NR646 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

      Anthem MRX 740 8K and Onkyo TX-NR646 support DTS:X.

      • DTS Neural:X: Anthem MRX 740 8K 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: Anthem MRX 740 8K 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: 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.

      IMAX Enhanced

      Anthem MRX 740 8K is IMAX Enhanced certified. To qualify for IMAX Enhanced certification, 4K HDR televisions, projectors, sound bars, a/v receivers, loudspeakers, powered subwoofers and other premium home entertainment devices must meet carefully prescribed performance requirements established by IMAX, DTS and Hollywood's leading experts.

      • What makes an IMAX Enhanced A/V receiver different from an A/V receiver with DTS:X technology? DTS:X technology is commonly found in most multi-channel A/V receivers on the market today. All IMAX Enhanced A/V receivers include DTS:X technology and deliver additional features, such as auto-sensing of IMAX Enhanced content, via IMAX Mode. IMAX Mode indicates that your A/V receiver supports fully immersive IMAX signature sound.
      AUDIO DECODING Anthem MRX 740 8K Onkyo TX-NR646
      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
      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
      IMAX Enhanced
      Auro 3D with Auro-Matic Upmixer

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      9. HDMI

      Anthem MRX 740 8K comes with 7 HDMI 2.1 inputs with 8K support. It has 3 outputs - 2 for MAIN and 1 for ZONE2.

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

      • 8K/60Hz and 4K/120Hz Passthrough on Anthem MRX 740 8K: All inputs pass up to 8K 50/60Hz and 4K 100/120Hz 4:4:4 video signal.
        4K/60Hz Passthrough on Onkyo TX-NR646: 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.
      • 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 Anthem MRX 740 8K only).
      • HDCP Copy Protection: Anthem MRX 740 8K is HDCP 2.3 and 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)

      Anthem MRX 740 8K supports HDR10, HDR10+, Dolby Vision and Hybrid Log-Gamma.

      Onkyo TX-NR646 supports HDR10 High dynamic range video has greater dynamic range than standard dynamic range (SDR) video with brighter whites and deeper blacks. The result is greater contrast and more details in dark and bright areas, better color and depth.


      Enhanced Audio Return Channel (eARC)

      Anthem MRX 740 8K supports Audio Return Channel (ARC) which allows the compatible TV to send audio signal to the a/v receiver through the same HDMI cable which is used to send audio and video signals to the TV. So one HDMI cable is used to transfer audio signal in both directions. New Enhanced ARC will support uncompressed audio formats such as Dolby Atmos, DTS:X, Dolby TrueHD and DTS HD Master Audio whereas the previous ARC could support only Dolby Digital, Dolby Digital Plus, DTS, DTS HD, and PCM.


      Gaming Features

      Anthem MRX 740 8K supports Auto Low Latency Mode (ALLM), Variable Refresh Rate (VRR) and Quick Frame Transport (QFT) for lag-free and smooth gaming.



      VIDEO FEATURES Anthem MRX 740 8K Onkyo TX-NR646
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.32.2 (3 inputs / 2 outputs)
      ALLM (Auto Low Latency Mode)
      VRR (Variable Refresh Rate)
      QFT (Quick Frame transport)
      3-D Ready
      Video Signal Passthroughup to 8K 50/60Hz and 4K 100/120Hz 4:4:4up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)

      Check the Price

      10. Inputs and Outputs

      Audio

      • Phono Input: There is an MM phono input on Anthem MRX 740 8K and Onkyo TX-NR646 with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the receiver.
      • Analog Pre-Outs: Anthem MRX 740 8K 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. Also, Anthem MRX 740 8K has 11 channel processing but has only 7 channel amplifier, so it needs external amplifier connected to the analog pre-outs in order to reach its maximum speaker configuration.
      • Analog Line Inputs and Outputs: There are 4 pair of line inputs on Anthem MRX 740 8K and 7 pair of line inputs on Onkyo TX-NR646 for connecting sources with analog outputs. There are also 1 pair of line outputs on the receivers.
      • Digital Inputs and Outputs: 3 optical inputs, 1 optical output and 2 coaxial inputs are available on Anthem MRX 740 8K and 2 optical inputs and 1 coaxial input are available on Onkyo TX-NR646 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:
      • Anthem MRX 740 8K
        Inputs:
        7   Outputs: 3 (2 for MAIN, 1 for ZONE2)
        8K Inputs: 7.
      • Onkyo TX-NR646
        Inputs:
        8 (1 front)   Outputs: 2 (simultaneous)
        8K Inputs: 0.
      • Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
      • Anthem MRX 740 8K
        Inputs:
        0   Outputs: 0.
      • Onkyo TX-NR646
        Inputs:
        3   Outputs: 0.
      • Component Video: Component video connection gives you the higher quality video compared to the composite video connection. So in case your old DVD player and other equipment do not have an HDMI output but have Component video output use this connection over the composite one. resolution on Component video connectors.
      • Onkyo TX-NR646 supports up to 480i/576i resolution on Component video connectors.
      • Anthem MRX 740 8K
        Inputs:
        0   Outputs: 0.
      • Onkyo TX-NR646
        Inputs:
        2   Outputs: 0.

      Front A/V Inputs

      • Anthem MRX 740 8K: None
      • Onkyo TX-NR646: HDMI

      Anthem MRX 740 8K

      Image cannot be found Image cannot be found

      Onkyo TX-NR646

      Image cannot be found Image cannot be found
      TERMINALS Anthem MRX 740 8K Onkyo TX-NR646
      HDMI Inputs78 (1 front)
      HDMI Outputs3 (2 for MAIN, 1 for ZONE2)2 (simultaneous)
      8K Inputs7
      USB Input for factory service1 (Rear)
      USB DC Out Port
      Optical Inputs32
      Optical Outputs1
      Coaxial Inputs21
      RCA Line Inputs47
      RCA Line Outputs11
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs11.20.2
      XLR Pre-outs
      Composite Video Inputs3
      Composite Video Outputs
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs2
      Component Video Outputs

      Check the Price

      11. Evaluations

      We evaluated Anthem MRX 740 8K and Onkyo TX-NR646 and gave them scores of 89 and 82 out of 100 recpectively. We also gave separate scores for 7 different categories according to the available features and specifications some of which are listed below. These evaluations are relative and may change each time a new receiver is added to the database.


      Anthem MRX 740 8K

      Onkyo TX-NR646

      OVERALL
      89
      OVERALL
      82

      Amplifier

      EXCELLENT
      89
      •   7.2 Channels
      •   High Power Output - 140 W
      GOOD
      81
      •   7.2 Channels
      •   Power Output - 100 W
      •   Independent Power Supply

      Audio Features

      EXCELLENT
      89
      •   7.2 Channels
      •   No Front Wide Channel Support
      •   11.1 Channel Processing
      •   Dolby Atmos
      •   No Dolby Atmos Height Virtualization
      •   DTS:X
      •   IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No DSD via HDMI
      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

      Video Features

      EXCELLENT
      100
      •   HDR10
      •   HDR10+
      •   Dolby Vision
      •   HDMI 2.1
      •   Auto Low Latency Mode Pass-through
      •   VRR
      •   QFT
      •   8K Passthrough
      GOOD
      80
      •   HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion

      Connectivity

      EXCELLENT
      88
      •   eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Does not Work with Amazon Alexa
      •   Chromecast Built-In
      •   7 HDMI Inputs
      •   4 HDMI Outputs
      •   7 8K Inputs
      •   No USB Input
      •   RCA Line Inputs
      •   Phono Input
      •   RCA Pre-Outs
      •   No Composite Video Inputs
      •   Ethernet
      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

      Zones

      GOOD
      77
      •   2 Zones
      GOOD
      77
      •   2 Zones

      Radio

      GOOD
      73
      •   Analog Tuner
      •   No Pandora
      •   Spotify
      •   No Tidal
      EXCELLENT
      93
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal

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

      Discussion

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