Denon AVR-X2500H vs Onkyo TX-NR646

      Highlights

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

      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 Denon AVR-X2500H 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 with Denon AVR-X2500H's being less powerful.


      Denon AVR-X2500H Onkyo TX-NR646

      Denon AVR-X2500H was introduced in 2018. It is equipped with 7 channel amplifier with 95 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 up to 4K 24/25/30p 4:4:4 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 Denon AVR-X2500H and Onkyo TX-NR646 and gave them scores of 88 and 82 out of 100 recpectively. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

      Denon AVR-X2500H

      Onkyo TX-NR646

      Amplifier
      88
      Amplifier
      81
      Audio Features
      85
      Audio Features
      84
      Video Features
      95
      Video Features
      80
      Connectivity
      85
      Connectivity
      83
      Zones
      81
      Zones
      77
      Radio
      96
      Radio
      93
      OVERALL
      88
      OVERALL
      82

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

      2. Pros and Cons

      In this section we present pros and cons of Denon AVR-X2500H and Onkyo TX-NR646.

      PROS

      Denon AVR-X2500H

      Onkyo TX-NR646

      •   Dolby Atmos
      •   DTS:X
      •   Auto Speaker Calibration System with Mic.
      •   HDR10
      •   Dolby Vision
      •   New HDCP Version
      •   Auto Low Latency Mode Pass-through
      •   Wi-Fi
      •   Bluetooth
      •   Works with Amazon Alexa
      •   HEOS
      •   8 HDMI Inputs
      •   USB Input
      •   Phono Input
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   Tidal
      •   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

      Denon AVR-X2500H

      Onkyo TX-NR646

      •   No Front Wide Channel Support
      •   No Dolby Atmos Height Virtualization
      •   No IMAX Enhanced
      •   No Auro 3D with Auro-Matic Upmixer
      •   No DSD via HDMI
      •   No HDR10+
      •   No eARC
      •   No 8K Passthrough
      •   0 8K Input
      •   No RCA Pre-Outs
      •   No Digital Radio
      •   Bluetooth 3․0 + EDR
      •   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

      Denon AVR-X2500H

      Onkyo TX-NR646

      •   7.2 Channels
      •   Power Output - 95 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   RCA Line Inputs
      •   2 Zones
      •   7.2 Channels
      •   Power Output - 100 W
      •   7.1 Channel Processing
      •   2 HDMI Outputs
      •   2 Zones

      3. Advantage of Denon AVR-X2500H

      This section shows those features and specifications which are the reason to choose Denon AVR-X2500H over Onkyo TX-NR646.

      Check the Price

      Denon AVR-X2500H vs Onkyo TX-NR646
      Certified 4 Ω Performance vs
      DTS Neural:X vs after firmware update
      DTS Virtual:X vs
      Higher Resolution Music Playback via USB up to 192 kHz vs up to 96 kHz
      Dialog Level Adjustment vs DTS:X only
      Dialog Normalization vs
      Audyssey Dynamic EQ vs
      Audyssey Dynamic Volume vs
      BT.2020 color space vs
      Dolby Vision vs
      HLG vs
      Auto Low Latency Mode Pass-through vs
      Video Signal Upscaling up to 4K 24/25/30p 4:4:4 vs
      isf Certified Calibration Control vs
      Works with Amazon Alexa vs
      AirPlay AirPlay 2 vs AirPlay
      More Composite Video Outputs 1 vs
      More Component Video Outputs 1 vs
      Front A/V Inputs HDMI, USB vs HDMI
      Speaker A/B assignable vs
      Detachable Power Cord vs
      Zone 2 Outs Pre Out vs RCA Line Out
      RS-232C Interface vs
      Remote (IR) Input/Output 1 / 1 vs 0 / 0
      Tidal vs
      Napster vs
      Color-Coded Speaker Terminals vs
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA) 185 W (10% THD) vs 175 W
      Higher DSD Sampling Rate via USB 5.6 MHz, 2.8 MHz vs 2.8 MHz, 5.6 MHz
      Wi-Fi Standard IEEE 802.11 a/b/g/n vs IEEE 802.11 b/g/n
      Wi-Fi Terminal Frequency 5 GHz, 2.4 GHz vs 2.4 GHz
      Newer Bluetooth Version 3․0 + EDR vs 2․1 + EDR
      Wider AM Frequency Range 520 kHz - 1710 kHz vs 522/530 kHz - 1611/1710 kHz
      Longer Warranty 3 Years vs 2 Years

      4. Advantage of Onkyo TX-NR646

      This section shows those features and specifications which are the reason to choose Onkyo TX-NR646 over Denon AVR-X2500H.

      Check the Price

      Denon AVR-X2500H vs Onkyo TX-NR646
      Higher Power Output 95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) vs 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      DTS Neo vs Neo:6 until firmware update
      Music Playback via USB MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD vs FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD
      High Resolution Audio Formats via USB Apple Lossless, WAV, FLAC, DSD vs FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
      DSD via HDMI vs 2-ch/Multi-ch Input
      Jitter Reduction vs PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
      Analog To HDMI Upconversion vs Component**, Composite
      InstaPrevue Input Source Prevue vs
      More RCA Line Inputs 4 vs 7
      More RCA Line Outputs vs 1
      More Composite Video Inputs 2 vs 3
      More Speaker Terminals 7 vs 9
      More Large Speaker Terminals 7 vs 9
      Higher Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC) 95 W (0.08% THD) vs 100 W (0.08% THD)
      Higher Power Output (6 Ω, 1 kHz, 1 channel driven, IEC) 150 W (1% THD) vs 160 W (1% THD)
      Higher S/N Ratio (Phono MM, IHF-A) 74 dB vs 80 dB

      5. Common Strengths and Weaknesses

      We already listed pros and cons of each model. However, you may also find useful to look at their common strengths and weaknesses shown side-by-side.

      STRENGTHS Denon AVR-X2500H Onkyo TX-NR646
        Dolby Atmos up to 5.1.2 up to 5.1.2 after firmware update
        DTS:X up to 5.1.2 up to 5.1.2 after firmware update
        Auto Speaker Calibration System with Mic. Audyssey MultEQ XT AccuEQ Advance
        HDR10
        New HDCP Version2.22.2 (3 inputs / 2 outputs)
        Wi-Fi
        Bluetooth SBC
        Many HDMI Inputs8 (1 front)8 (1 front)
        USB Input1 Front for USB memory1 (Rear)
        Phono Input
        Composite Video Inputs23
        Component Video Inputs22
        Ethernet
        Analog Tuner FM/AM FM/AM
        Pandora
        Spotify
      WEAKNESSES Denon AVR-X2500H Onkyo TX-NR646
        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 50/60Hz 4:4:4up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
        Few 8K Inputs
        No RCA Pre-Outs0.20.2
        No Digital Radio
        Old Bluetooth Version3․0 + EDR2․1 + EDR

      6. Amplifier

      Denon AVR-X2500H Onkyo TX-NR646

      7 channel Amplifier: Denon AVR-X2500H features 7 channel power amplifier. It is rated at 95 W (8 Ω, 20 Hz - 20 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 Denon AVR-X2500H Onkyo TX-NR646
      Channels7.27.2
      Power Output95 W (8 Ω, 20 Hz - 20 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 assignable

      Check the Price

      7. Speaker Configurations

      Denon AVR-X2500H'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:
      • Denon AVR-X2500H: 5.2.2 with internal amplifier.
      • Onkyo TX-NR646: 5.2.2 with internal amplifier.
      • DTS:X Configurations: The following speaker configurations are supported for DTS:X:
      • Denon AVR-X2500H: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal 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:
      • Denon AVR-X2500H: 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

      Denon AVR-X2500H 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

      Denon AVR-X2500H and Onkyo TX-NR646 support DTS:X.

      • DTS Neural:X: Denon AVR-X2500H 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: Denon AVR-X2500H 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.
      AUDIO DECODING Denon AVR-X2500H Onkyo TX-NR646
      Dolby Atmos up to 5.1.2 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 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

      Check the Price

      9. HDMI

      Denon AVR-X2500H and Onkyo TX-NR646 come with 8 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 50/60Hz 4:4:4 video signal.
      • 4K Upscaling on Denon AVR-X2500H: It can upscale up to 4K 24/25/30p 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 Denon AVR-X2500H 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)

      Denon AVR-X2500H supports 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.


      Gaming Features

      Denon AVR-X2500H supports Auto Low Latency Mode (ALLM) for lag-free and smooth gaming.



      VIDEO FEATURES Denon AVR-X2500H Onkyo TX-NR646
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.22.2 (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 50/60Hz 4:4:4up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
      Video Signal Upscaling up to 4K 24/25/30p 4:4:4

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      10. Inputs and Outputs

      Audio

      • Phono Input: There is an MM phono input on Denon AVR-X2500H and 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 4 pair of line inputs on Denon AVR-X2500H and 7 pair of line inputs on Onkyo TX-NR646 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 for digital audio connections on both receivers.
      • Headphone Output: There is a 6.3 mm (1/4") headphone output jack on the front panel of each receiver.

      Video

      • HDMI:
      • Denon AVR-X2500H
        Inputs:
        8 (1 front)   Outputs: 2 (simultaneous)
        8K Inputs: 0.
      • 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.
      • Denon AVR-X2500H
        Inputs:
        2   Outputs: 1.
      • 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.
      • Denon AVR-X2500H
        Inputs:
        2   Outputs: 1.
      • Onkyo TX-NR646
        Inputs:
        2   Outputs: 0.

      Front A/V Inputs

      • Denon AVR-X2500H: HDMI, USB
      • Onkyo TX-NR646: HDMI

      Denon AVR-X2500H

      Image cannot be found Image cannot be found

      Onkyo TX-NR646

      Image cannot be found Image cannot be found
      TERMINALS Denon AVR-X2500H Onkyo TX-NR646
      HDMI Inputs8 (1 front)8 (1 front)
      HDMI Outputs2 (simultaneous)2 (simultaneous)
      8K Inputs
      USB Input1 Front for USB memory1 (Rear)
      USB DC Out Port
      Optical Inputs22
      Optical Outputs
      Coaxial Inputs11
      RCA Line Inputs47
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs23
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs22
      Component Video Outputs1

      Check the Price

      11. Evaluations

      We evaluated Denon AVR-X2500H and Onkyo TX-NR646 and gave them scores of 88 and 82 out of 100 recpectively. We also gave separate scores for 7 different categories according to the available features and specifications some of which are listed below. These evaluations are relative and may change each time a new receiver is added to the database.


      Denon AVR-X2500H

      Onkyo TX-NR646

      OVERALL
      88
      OVERALL
      82

      Amplifier

      EXCELLENT
      88
      •   7.2 Channels
      •   Power Output - 95 W
      GOOD
      81
      •   7.2 Channels
      •   Power Output - 100 W
      •   Independent Power Supply

      Audio Features

      EXCELLENT
      85
      •   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
      •   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
      95
      •   HDR10
      •   No HDR10+
      •   Dolby Vision
      •   Auto Low Latency Mode Pass-through
      •   No 8K Passthrough
      GOOD
      80
      •   HDR10
      •   No HDR10+
      •   No Dolby Vision
      •   No 8K Passthrough
      •   Analog To HDMI Upconversion

      Connectivity

      EXCELLENT
      85
      •   No eARC
      •   New HDCP Version
      •   Wi-Fi
      •   Bluetooth
      •   Works with Amazon Alexa
      •   HEOS
      •   8 HDMI Inputs
      •   2 HDMI Outputs
      •   0 8K Input
      •   USB Input
      •   RCA Line Inputs
      •   Phono Input
      •   No RCA Pre-Outs
      •   Composite Video Inputs
      •   Component Video Inputs
      •   Ethernet
      •   Bluetooth 3․0 + EDR
      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
      81
      •   2 Zones
      GOOD
      77
      •   2 Zones

      Radio

      EXCELLENT
      96
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   Tidal
      EXCELLENT
      93
      •   Analog Tuner
      •   Pandora
      •   Spotify
      •   No Tidal

      12. Specifications

      GENERAL Denon AVR-X2500H Onkyo TX-NR646
      BrandDenonOnkyo
      ModelAVR-X2500HTX-NR646
      TypeA/V ReceiverA/V Receiver
      CountryUSAUSA
      Release Year20182015
      PredecessorDenon AVR-X2400H Onkyo TX-NR636
      SuccessorDenon AVR-X2600H Onkyo TX-NR656
      AMPLIFIER Denon AVR-X2500H Onkyo TX-NR646
      Channels7.27.2
      Power Output95 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
      Front Wide Channel Support
      Discrete Amplification
      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
      Mono Block Power Amplifier Construction
      Independent Block Construction (Amp/Preprocessor)
      Bi-amp Capability assignable
      BTL (Bridged Transless or Bridging)
      AUDIO FEATURES Denon AVR-X2500H Onkyo TX-NR646
      Digital Signal Processing (DSP) EngineFour 300 MHz DSP coresDual 32-bit DSP for Powerful Advanced Processing
      DACAKM AK4490EQAsahi Kasei AK4458
      DAC Specs384 kHz/32 Bit384 kHz/32 Bit
      Maximum Channel Processing7.17.1
      D.D.S.C. HD Digital
      Alpha Processing
      Air Studios Monitor Certification
      Dolby Atmos up to 5.1.2 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 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
      Network Audio FormatsMP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, DSD
      Music Playback via USBMP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSDFLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD
      High Resolution Music Playback via USB and/or Network up to 192 kHz up to 96 kHz
      High Resolution Audio Formats via USBApple Lossless, WAV, FLAC, DSDFLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
      Gapless Playback
      DSD via HDMI 2-ch/Multi-ch Input
      DSD via USB 2-ch Input 2-ch Input
      DSD to PCM Converter
      USB DAC
      Jitter Reduction PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
      DTS Dialogue Control
      Dialog Enhancement
      Dialog Level Adjustment DTS:X only
      Dialog normalization
      Dialogue Lift
      Tone Control Front L/R Channels
      Compressed Music Enhancer Advanced Music Optimizer (bluetooth included)
      High-resolution Music Enhancer
      THX Processing Mode
      Audyssey Dynamic EQ
      Audyssey Dynamic Volume
      Audyssey LFC
      Audyssey Sub EQ HT
      Audyssey DSX
      Phase-Matching Bass Boost for Deep Bass and Clear Mid-Range
      Direct Mode
      Pure Audio Mode
      Pure Direct Analog Path Mode
      Pure Direct Mode
      Virtual Speakers T-D (Theater-Dimensional)
      Independent Subwoofer Outputs
      CALIBRATION Denon AVR-X2500H Onkyo TX-NR646
      Auto Speaker Calibration System with Mic. Audyssey MultEQ XT AccuEQ Advance
      Audyssey App Support
      Optimized Bass Redirection
      Bass Sync
      VIDEO FEATURES Denon AVR-X2500H Onkyo TX-NR646
      HDR10
      HDR10+
      Dynamic HDR
      BT.2020 color space
      Dolby Vision
      HLG (Hybrid Log Gamma)
      HDBaseT Compatible
      Enhanced Audio Return Channel (eARC)
      HDCP Version2.22.2 (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 50/60Hz 4:4:4up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
      Video Signal Upscaling up to 4K 24/25/30p 4:4:4
      Analog To HDMI Upconversion Component**, Composite
      Component Video Upscaling
      Analog to Analog Video conversion
      Component Video Maximum Resolution480i/576i
      isf Certified Calibration Control
      CONNECTIVITY Denon AVR-X2500H Onkyo TX-NR646
      Wi-Fi
      Bluetooth SBC
      Bluetooth Headphone Transmission
      Works with Amazon Alexa
      Chromecast Built-In
      Works with SonoS
      HEOS
      DTS Play-Fi
      MHL Input
      DLNA 1.5
      AirPlay AirPlay 2 AirPlay
      Apple Product Connection iPod, iPhone and iPad iPod, iPhone and iPad
      Remote App Denon 2016 AVR Remote App for iOS and Android devices and Kindle FireOnkyo Remote App for iPod touch/iPhone and Android-Powered Devices
      InstaPrevue Input Source Prevue
      TERMINALS Denon AVR-X2500H Onkyo TX-NR646
      HDMI Inputs8 (1 front)8 (1 front)
      HDMI Outputs2 (simultaneous)2 (simultaneous)
      8K Inputs
      USB Input1 Front for USB memory1 (Rear)
      USB DC Out Port
      Optical Inputs22
      Optical Outputs
      Coaxial Inputs11
      RCA Line Inputs47
      RCA Line Outputs1
      XLR Line Inputs
      Phono Input
      Multi-Channel Input
      RCA Pre-Outs0.20.2
      XLR Pre-outs
      Composite Video Inputs23
      Composite Video Outputs1
      S-Video Inputs
      S-Video Outputs
      Component Video Inputs22
      Component Video Outputs1
      Ethernet
      Ethernet Switch
      PC In
      Front A/V InputsHDMI, USBHDMI
      Speaker A/B assignable
      Headphone Out6.3 mm (1/4")6.3 mm (1/4")
      Detachable Power Cord
      uport
      ZONES Denon AVR-X2500H Onkyo TX-NR646
      Number of Zones22
      Powered Zones 2 2
      Zone 2 OutsPre OutRCA Line Out
      Whole House Mode
      RS-232C Interface
      +12V Trigger Output0
      Remote (IR) Input/Output1 / 10 / 0
      MISCELLANEOUS Denon AVR-X2500H Onkyo TX-NR646
      On-Screen Display Advanced Graphic User Interface Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up
      GUI Languages3
      Web Control
      IP Control
      Control4 SDDP
      Display 1 line
      Remote ControllerRC-1228
      Pre-programmed / Learnable / LCD Display / /
      ONKYO-RI System Control
      RIHD (Remote Interactive Over HDMI)
      Pre-Pro/Learning Remote /
      On Screen Remote Programming
      Bi-directional Remote Setup via GUI
      Smart Grid-Ready
      Denon Link HD
      Setup Assistant
      Quick Select plus / Quick Select /
      RADIO Denon AVR-X2500H Onkyo TX-NR646
      Analog Tuner FM/AM FM/AM
      Presets40
      Digital Radio
      Internet Radio TuneIn TuneIn
      Pandora
      Spotify
      Tidal
      Deezer
      Napster
      SiriusXM
      CONSTRUCTION Denon AVR-X2500H Onkyo TX-NR646
      Front Panelnot Metal
      Solid Aluminum Front
      Speaker Terminals79
      Large Speaker Terminals79
      Color-Coded Speaker Terminals
      Transparent High-Grade Speaker Terminals
      High Grade Audio Components
      Gold plated RCA terminals
      POWER Denon AVR-X2500H Onkyo TX-NR646
      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 Consumption500 W6.4 A
      No Sound PowerECO On/Off: 35 W/75 W70 W
      Standby Power0.1 W0.1 W
      Capacitor Bank8,200 µF
      ECO Mode / Hybrid Standby Function
      Auto Power off
      PHYSICAL Denon AVR-X2500H Onkyo TX-NR646
      Dimensions (W x H x D)434 mm x 167 mm x 341 mm (with antenna: 434 mm x 237 mm x 341 mm)
      17 1/8" x 6 5/8" x 13 1/2" (with antenna: 17 1/8" x 9 3/8" x 13 1/2")
      435 mm x 173.5 mm x 329 mm
      17-1/8" x 6-13/16" x 12-15/16"
      Weight9.4 kg (20 lbs 12 oz)9.4 kg (20.7 lbs)
      SPECIFICATIONS Denon AVR-X2500H Onkyo TX-NR646
      Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)95 W (0.08% THD)100 W (0.08% THD)
      Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)125 W (0.7% THD)
      Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)170 W (0.9% THD)
      Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)185 W (10% THD)175 W
      Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)150 W (1% THD)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)
      Phono Distortion0.03% (1 kHz, 3 V)
      Damping Factor60 (Front, 1 kHz, 8 Ω)
      Input Sensitivity and Impedance (Line)200 mV/47 kΩ200 mV/47 kΩ (Line)
      Input Sensitivity and Impedance (Phono MM)2.5 mV3.5 mV/47 kΩ (Phono mm)
      Phono Overload70 mV (MM, 1 kHz 0.5% Direct)
      S/N Ratio (Line, IHF-A)100 dB100 dB
      S/N Ratio (Phono MM, IHF-A)74 dB80 dB
      Phono RIAA Deviation±1 dB (20-20 kHz)
      Frequency Response (Analog In)+1/-3 dB (10 Hz to 100 kHz, Direct mode)10 Hz - 100 kHz/+1 dB, -3 dB (Direct mode)
      DSD Sampling Rates via HDMI2.8 MHz, 5.6 MHz
      DSD Sampling Rates via USB5.6 MHz, 2.8 MHz2.8 MHz, 5.6 MHz
      Video Input Sensitivity/Output Level and Impedance 1 Vp-p/75 Ω (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/CB, PR/CR)
      1 Vp-p/75 Ω (Composite)
      Video Frequency Response5 Hz to 60 MHz, 0 dB/-3 dB (Component)
      5 Hz to 10 MHz, 0 dB/-3 dB (Composite)
      5 Hz - 100 MHz/+0 dB, -3 dB (Component)
      Ethernet Standard100BASE-TX10BASE-T/100BASE-TX
      Wi-Fi StandardIEEE 802.11 a/b/g/nIEEE 802.11 b/g/n
      Wi-Fi Terminal Frequency5 GHz, 2.4 GHz2.4 GHz
      Bluetooth Version3․0 + EDR2․1 + EDR
      Bluetooth Frequency2.4 GHz2.4 GHz
      USB TerminalUSB2.0 5V, 1 A5 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: 2.8 µV (20.2 dBf)
      FM Effective Sensitivity1.2 µV (12.8 dBf)
      FM S/N RatioMono/Stereo: 70 dB/67 dB
      FM Harmonic Distortion (IHF, 1 kHz)Mono/Stereo: 0.7%/1.0%
      AM Frequency520 kHz - 1710 kHz522/530 kHz - 1611/1710 kHz
      AM Effective Sensitivity18 µV
      Warranty3 Years2 Years

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

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