1-on-1 Comparison

Side-by-Side Comparison

Onkyo TX-NR656

Onkyo TX-NR646

SCORE:
81
SCORE:
81

Highlights

  • 7.2 channels
  • 7.1 channel processing
  • 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • Dolby Atmos, DTS:X capable
  • HDR10, Dolby Vision, 4K Upscaling, 4K Passthrough
  • AirPlay, Chromecast
  • Ethernet, Wi-Fi, Bluetooth
  • USB and Phono inputs

Highlights

  • 7.2 channels
  • 7.1 channel processing
  • 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • Dolby Atmos, DTS:X capable
  • HDR10, 4K Passthrough
  • AirPlay, DLNA
  • Ethernet, Wi-Fi, Bluetooth
  • USB and Phono inputs

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

Content

Overview

Here we are comparing Onkyo TX-NR656 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.


Onkyo TX-NR656 Onkyo TX-NR646

Onkyo TX-NR656 was introduced in 2016. 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 and upscales 1080p to 4K 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 the a/v receiver and gave 81 overall score out of 100. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

We evaluated the a/v receiver and gave 81 overall score out of 100. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

AMPLIFIER
71
VIDEO FEATURES
92
AUDIO FEATURES
86
CONNECTIVITY
83
MULTIZONE
77
MISCELLANEOUS
65
RADIO
87
OVERALL
81

AMPLIFIER
81
VIDEO FEATURES
80
AUDIO FEATURES
84
CONNECTIVITY
82
MULTIZONE
77
MISCELLANEOUS
67
RADIO
89
OVERALL
81

Advantage of Onkyo TX-NR656

This section shows those features and specifications which are the reason to choose Onkyo TX-NR656 over Onkyo TX-NR646.

Onkyo TX-NR656 has bigger power supply, higher signal to noise ratio, higher DSD sampling rate via USB, higher wi-fi standard and higher bluetooth standard. It supports Tidal. In video department only Onkyo TX-NR656 supports Dolby Vision.

Onkyo TX-NR656 vs Onkyo TX-NR646
VLSC (Vector Linear Shaping Circuitry) Front L/R channels vs
DTS Neural:X after firmware update vs after firmware update
Higher Resolution Music Playback via USB up to 192 kHz vs up to 96 kHz
High Resolution Audio Formats via USB FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD vs FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
Dialog Normalization vs
Dolby Vision vs
BT.2020 color space vs
Video Signal Upscaling 1080p to 4K vs
FlareConnect vs
Chromecast Built-In vs
Front A/V Inputs HDMI, Mini-Jack vs HDMI
Tidal vs
Bigger Power Supply 580 W vs 6.4 A
Higher S/N Ratio (Line, IHF-A) 106 dB vs 100 dB
Higher DSD Sampling Rate via USB 2.8 MHz, 5.6 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 4․1 + LE vs 2․1 + EDR

Advantage of Onkyo TX-NR646

This section shows those features and specifications which are the reason to choose Onkyo TX-NR646 over Onkyo TX-NR656.

Only Onkyo TX-NR646 supports Pandora.

Onkyo TX-NR656 vs Onkyo TX-NR646
Music Playback via USB FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD vs FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD
InstaPrevue Input Source Prevue vs
More RCA Line Outputs vs 1
More Composite Video Inputs 2 vs 3
ONKYO-RI System Control vs
Pre-Pro/Learning Remote / vs /
Pandora vs
Independent Power Supply vs 2
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

Common Strengths and Weaknesses

Here we list common strengths and weaknesses of both receivers.

STRENGTHS
  Dolby Atmos
  DTS:X
  DSD via HDMI
  Auto Speaker Calibration System with Mic.
  New HDCP Version
  HDR10
  4K or 8K Video Passthrough
  Analog To HDMI Upconversion
  Ethernet
  Wi-Fi
  Bluetooth
  Many HDMI Inputs
  USB Input
  Many RCA Line Inputs
  Many Optical Inputs
  Composite Video Inputs
  Component Video Inputs
  Zones
  Analog Tuner
  Spotify
WEAKNESSES
  No Front Wide Channel Support
  No Dolby Atmos Height Virtualization
  No IMAX Enhanced
  No Auro 3D with Auro-Matic Upmixer
  No eARC
  No HDR10+
  Does not Work with Amazon Alexa
  Few 8K Inputs
  No RCA Pre-Outs

Audio Section

Amplifier

Onkyo TX-NR656 Onkyo TX-NR646

7 channel Amplifier: Onkyo TX-NR656 features 7 channel power amplifier. It is rated at 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven).

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).

  • Dynamic Audio Amplification: Onkyo TX-NR656 features Dynamic Audio Amplification which is Onkyo’s amplification philosophy that focuses on capturing the energy and dynamism contained in the audio signal and reproducing it without loss. Audio signals are not static like a test tone, but rather a countless collection of constantly moving waves. While static measurements such as S/N ratio and Total Harmonic Distortion are important, Onkyo believes that excellent dynamic and transient response is the key to emotionally involving sound. Dynamism - the “life” in music - is achieved when the amp can respond to changes in the signal instantaneously, so notes start and stop naturally and the nuances in attack, decay, sustain, and release are voiced with conviction. Onkyo home theater receivers represent the culmination of almost 70 years’ experience in amplifier design. The unique elements of their amplification system comprise high-current, low-impedance architecture to accurately control large speaker cones while enabling instantaneous response to dynamic changes, and discrete wide-range amplifier circuit topology to eliminate phase shift for clear and accurate audio imaging.
  • 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.

Speaker Configurations

Onkyo TX-NR656'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:
  • Onkyo TX-NR656: 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:
  • Onkyo TX-NR656: 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:
  • Onkyo TX-NR656: 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.

  • Dolby Atmos

    Onkyo TX-NR656 and Onkyo TX-NR646 support Dolby Atmos. It is a cinematic audio format in which sounds exist as individual entities, called audio objects. In Dolby Atmos, any sound can exist as an independent audio object, free of channel restrictions. They can be precisely placed and moved anywhere in your room, including overhead, to flow above and around you in three-dimensional space. Through the use of audio objects, overhead sound, and all the richness, clarity, and power of Dolby sound, Dolby Atmos turns your room into an amazing place for entertainment. The format supports up to 128 simultaneous independent audio objects in a mix for rich, realistic, and breathtaking sound. It recreates the director's original concept through descriptive metadata to provide customized playback for home theater and delivers sounds above you through overhead speakers, special upward-firing Dolby Atmos speakers, or a Dolby Atmos enabled sound bar.

    • 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-NR656 and Onkyo TX-NR646 support DTS:X. A technique used in DTS:X is similar to the one used in Dolby Atmos. Instead of a fixed number of channels, DTS:X defines object locations from the listener in polar coordinates. An a/v receiver then dynamically renders sound according to the current speaker configuration. The speaker layout employed by DTS:X is the sum of Dolby Atmos and Auro-3D. It has standard 7.1 channel base layer, a 5 channel height layer above the base layer on the front and side walls, and 3 rows of speakers on the ceiling.

    • DTS Neural:X: Onkyo TX-NR656 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: 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.

    Sound Processing

    • Compressed Music Enhancer: Onkyo TX-NR656 and Onkyo TX-NR646 feature Compressed Music Enhancer which enhances the quality of the music files with lossy compression.
    • Advanced Music Optimizer: Compressed music enhancement in Onkyo TX-NR656 and Onkyo TX-NR646 is done by Onkyo’s Advanced Music Optimizer. While MP3 or AAC files may sound fine through the headphones of your portable digital player, the limitations of these files can be exposed when played back through a quality home entertainment system. This is because a significant amount of high-frequency bit information is lost during the file-compression process. To counter this, Onkyo has designed the Advanced Music Optimizer to compensate for lost bit information and improve the quality of compressed audio signals. This results in a clearer and more expansive sound. Also included in this technology is a loudness correction feature that further improves the audio character of compressed files.

    Room Calibration

    Onkyo TX-NR656 comes with AccuEQ with AccuReflex™ and Onkyo TX-NR646 comes with AccuEQ Advance room correction system.

    • AccuEQ: First, AccuEQ detects the presence of speakers and evaluates the impedance of each. Next, it pinpoints their distance relative to the main listening position using the mic and sets suitable sound-pressure levels. Then it selects the optimal crossover frequency so that deeper bass rolls smoothly off to the subwoofer. Finally, AccuEQ performs frequency response equalization based on room-acoustic and speaker data collected via microphone. The sound-field is now tailored around the listening position, resulting in a more immersive and realistic in-film experience.

Video Section

HDMI

Onkyo TX-NR656 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/60p (RGB/YCbCr4:4:4) video signal.
  • 4K Upscaling on Onkyo TX-NR656: It can upscale 1080p to 4K from HDMI and analog sources.
  • Analog To HDMI Upconversion: Both receivers support 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-NR656 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-NR656 supports HDR10 and Dolby Vision.

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.

  • HDR10: HDR10 uses the wide-gamut Rec. 2020 color space. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 supports 10-bit color which corresponds to 1024 shades of the primary RGB colors. It is technically limited to a maximum of 10,000 nits peak brightness, however common HDR10 contents are mastered with peak brightness from 1,000 to 4,000 nits.
  • Dolby Vision: Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. It covers content creation, distribution, and playback. Like HDR10+, it includes dynamic metadata that are used to adjust and optimize each frame of the HDR video to the consumer display's capabilities in a way specified by the content creator. Dolby Vision allows for a maximum resolution of 8K up to 12-bit color depth, maximum peak brightness of 10,000 nits and a color gamut up to Rec. 2020. It uses Dolby's proprietary dynamic metadata defined in SMPTE ST 2094-10.

Inputs and Outputs

Audio

  • Analog Line Inputs and Outputs: There are 7 pair of line inputs on both receivers for connecting sources with analog outputs. There is also 1 pair of line outputs on Onkyo TX-NR646.
  • Digital Inputs and Outputs: 1 optical input, 2 optical outputs 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:
  • Onkyo TX-NR656
    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.
  • Onkyo TX-NR656
    Inputs:
    2   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. Both receivers support up to 480i/576i resolution on Component video connectors.
  • Onkyo TX-NR656
    Inputs:
    2   Outputs: 0.
  • Onkyo TX-NR646
    Inputs:
    2   Outputs: 0.

Front A/V Inputs

  • Onkyo TX-NR656: HDMI, Mini-Jack
  • Onkyo TX-NR646: HDMI

Onkyo TX-NR656

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Onkyo TX-NR646

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Specifications

And in the end let us list all the available specifications of the receivers side-by-side.

BASICS Onkyo TX-NR656 Onkyo TX-NR646
BrandOnkyoOnkyo
ModelTX-NR656TX-NR646
TypeA/V ReceiverA/V Receiver
CountryTaiwanTaiwan
Release Year20162015
AMPLIFIER Onkyo TX-NR656 Onkyo TX-NR646
Channels7.27.2
Front Wide Channel Support
Dynamic Audio Amplification
Non-Phase Shift Amplifier
WRAT (Wide Range Amplifier Technology)
VLSC (Vector Linear Shaping Circuitry) Front L/R channels
Optimum Gain Volume Circuitry
THX™ Certification
Continuous 6 Ω Rated
Certified 4 Ω Performance
Discrete Output Stage Circuitry
3-Stage Inverted Darlington Circuitry
PUSH-PULL Design
Independent Block Construction (Amp/Preprocessor)
Bi-amp Capability
BTL (Bridged Transless or Bridging)
AUDIO Onkyo TX-NR656 Onkyo TX-NR646
Digital Signal Processing (DSP) Engine32-bit Digital Signal Processing EnginessDual 32-bit DSP for Powerful Advanced Processing
DACAKM AK4458 (8 Channels x 1)Asahi Kasei AK4458
DAC Specs384 kHz/32 Bit384 kHz/32 Bit
Maximum Channel Processing7.17.1
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 after firmware update
DTS Virtual:X
DTS Neo Neo:6 until firmware update Neo:6 until firmware update
DTS-HD Master Audio
DTS-HD High Resolution Audio
DTS 96/24
DTS Express
DTS-ES
IMAX Enhanced
Auro 3D with Auro-Matic Upmixer
PCM 2-ch/Multi-ch Input 2-ch/Multi-ch Input
Music Playback via USBFLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHDFLAC, 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 USBFLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHDFLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
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 PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
DTS Dialog Control
Dialog Enhancement
Dialog Level Adjustment DTS:X only
Dialog Normalization
Dialogue Lift
Tone Control Front L/R Channels Front L/R Channels
Compressed Music Enhancer Advanced Music Optimizer (bluetooth included) 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-NR656 Onkyo TX-NR646
Auto Speaker Calibration System with Mic. AccuEQ with AccuReflex™ AccuEQ Advance
VIDEO Onkyo TX-NR656 Onkyo TX-NR646
Enhanced ARC
HDCP Version2.2 (3 inputs / 2 outputs)2.2 (3 inputs / 2 outputs)
HDR10
HDR10+
Dynamic HDR
Dolby Vision
HLG (Hybrid Log Gamma)
BT.2020 color space
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 (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
Video Signal Upscaling 1080p to 4K
Analog To HDMI Upconversion Component**, Composite Component**, Composite
Component Video Upscaling
Analog to Analog Video conversion
Component Video Maximum Resolution480i/576i480i/576i
isf Certified Calibration Control
CONNECTIVITY Onkyo TX-NR656 Onkyo TX-NR646
MHL Input
DLNA 1.5
FireConnect
FlareConnect
Chromecast Built-In
DTS Play-Fi
Works with Amazon Alexa
Works with SONOS
AirPlay AirPlay AirPlay
Apple Product Connection iPod, iPhone and iPad iPod, iPhone and iPad
Remote AppOnkyo Remote App for iPod touch/iPhone and Android-Powered DevicesOnkyo Remote App for iPod touch/iPhone and Android-Powered Devices
InstaPrevue Input Source Prevue
Ethernet
Ethernet Switch
Wi-Fi
Bluetooth SBC, AAC
HDBaseT Compatible
HDMI Inputs8 (1 front)8 (1 front)
HDMI Outputs2 (simultaneous)2 (simultaneous)
8K Inputs
USB Input1 (Rear)1 (Rear)
USB DC Out Port
RCA Line Input7 (1 Front)7
RCA Line Output1
XLR Line Inputs
Phono Input
Optical Inputs22
Optical Outputs
Coaxial Inputs11
Composite Video Input23
Composite Video Output
S-Video Input
S-Video Output
Component Video Input22
Component Video Output
PC In
Multi-Channel Input
RCA Pre-Outs0.20.2
XLR Pre-outs
Front A/V InputsHDMI, Mini-JackHDMI
Speaker A/B
Headphone Out6.3 mm (1/4")6.3 mm (1/4")
ZONES Onkyo TX-NR656 Onkyo TX-NR646
Zones22
Powered Zones 2 2
Zone 2 OutsRCA Line OutRCA Line Out
Whole House Mode
RS-232C Interface
+12V Trigger Output00
Remote (IR) Input/Output0 / 00 / 0
MISC Onkyo TX-NR656 Onkyo TX-NR646
On-Screen Display Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up
GUI Languages9
Detachable Power Cord
uport
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-NR656 Onkyo TX-NR646
Analog Tuner FM/AM FM/AM
Presets4040
Digital Radio
Internet Radio TuneIn TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM Internet Radio
CONSTRUCTION Onkyo TX-NR656 Onkyo TX-NR646
Solid Aluminum Front
Speaker Terminals99
Large Speaker Terminals99
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
18mm Pitch High Grade Pre-outs
19mm-Pitch Audio Inputs
Gold plated RCA terminals
POWER Onkyo TX-NR656 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 Massive High Power Transformer
Toroidal Transformer
Power Consumption580 W6.4 A
Maximum Power Consumption1490 W
No Sound Power65 W70 W
Standby Power0.1 W0.1 W
Capacitor Bank8,200 µF
GENERAL Onkyo TX-NR656 Onkyo TX-NR646
ECO Mode / Hybrid Standby Function
Dimensions (W x H x D)435 mm x 173.5 mm x 378 mm
17-1/8" x 6-13/16" x 14-7/8"
435 mm x 173.5 mm x 329 mm
17-1/8" x 6-13/16" x 12-15/16"
Weight10.0 kg (22.0 lbs)9.4 kg (20.7 lbs)
Warranty2 Years2 Years
SPECS Onkyo TX-NR656 Onkyo TX-NR646
Power Output (8 Ω, 20 Hz - 20 kHz, 2100 W (0.08% 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)175 W
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)160 W (1% THD)160 W (1% THD)
Dynamic Power per Channel (3 Ω, Front)240 W240 W
Dynamic Power per Channel (4 Ω, Front)210 W210 W
Dynamic Power per Channel (8 Ω, Front)120 W120 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)3.5 mV/47 kΩ3.5 mV/47 kΩ (Phono mm)
Rated Headphone Jack Output Level and Impedance330 Ω
Rated Headphone Power Output90 mW (32 Ω, 1 kHz, 10% THD)
Phono Overload70 mV (MM, 1 kHz 0.5%)70 mV (MM, 1 kHz 0.5% Direct)
S/N Ratio (Line, IHF-A)106 dB100 dB
S/N Ratio (Phono MM, IHF-A)80 dB80 dB
Frequency Response (Analog In)10 Hz - 100 kHz/+1 dB, -3 dB (Direct)10 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, 5.6 MHz2.8 MHz, 5.6 MHz
Video Input Sensitivity/Output Level and Impedance1 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 - 100 MHz/+0 dB, -3 dB (Component)
Ethernet Standard10BASE-T/100BASE-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 Version4․1 + LE2․1 + EDR
Bluetooth Frequency2.4 GHz2.4 GHz
USB Terminal5 V, 1 A5 V, 1 A
FM Frequency87.5 MHz - 107.9 MHz87.5 MHz - 107.9 MHz
AM Frequency530 kHz - 1710 kHz522/530 kHz - 1611/1710 kHz

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

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