| GENERAL | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Brand | Onkyo | Onkyo |
| Model | TX-NR656 | TX-NR646 |
| Type | A/V Receiver | A/V Receiver |
| Country | North America | USA |
| Release Year | 2016 | 2015 |
| Predecessor | Onkyo TX-NR646 | Onkyo TX-NR636 |
| Successor | Onkyo TX-NR676 | Onkyo TX-NR656 |
| AMPLIFIER | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Channels | 7.2 | 7.2 |
| Power Output | 100 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 | ||
| 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 FEATURES | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Digital Signal Processing (DSP) Engine | 32-bit Digital Signal Processing Enginess | Dual 32-bit DSP for Powerful Advanced Processing |
| DAC | AKM AK4458 (8 Channels x 1) | Asahi Kasei AK4458 |
| DAC Specs | 384 kHz/32 Bit | 384 kHz/32 Bit |
| Maximum Channel Processing | 7.1 | 7.1 |
| 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 |
| Network Audio Formats | FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, MPEG-4 AAC, LPCM | |
| Music Playback via USB | FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD | FLAC, 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 USB | FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD | FLAC, 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 Dialogue 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 FEATURES | Onkyo TX-NR656 | 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 Version | 2.2 (3 inputs / 2 outputs) | 2.2 (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 Passthrough | up 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 Resolution | 480i/576i | 480i/576i |
| isf Certified Calibration Control |
| CONNECTIVITY | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| 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 | iPod, iPhone and iPad |
| Remote App | Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices | Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices |
| InstaPrevue Input Source Prevue |
| TERMINALS | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| HDMI Inputs | 8 (1 front) | 8 (1 front) |
| HDMI Outputs | 2 (simultaneous) | 2 (simultaneous) |
| 8K Inputs | ||
| USB Input | 1 (Rear) | 1 (Rear) |
| USB DC Out Port | ||
| Optical Inputs | 2 | 2 |
| Optical Outputs | ||
| Coaxial Inputs | 1 | 1 |
| RCA Line Inputs | 7 (1 Front) | 7 |
| RCA Line Outputs | 1 | |
| XLR Line Inputs | ||
| Phono Input | ||
| Multi-Channel Input | ||
| RCA Pre-Outs | 0.2 | 0.2 |
| XLR Pre-outs | ||
| Composite Video Inputs | 2 | 3 |
| Composite Video Outputs | ||
| S-Video Inputs | ||
| S-Video Outputs | ||
| Component Video Inputs | 2 | 2 |
| Component Video Outputs | ||
| Ethernet | ||
| Ethernet Switch | ||
| PC In | ||
| Front A/V Inputs | HDMI, Mini-Jack | HDMI |
| Speaker A/B | ||
| Headphone Out | 6.3 mm (1/4") | 6.3 mm (1/4") |
| Detachable Power Cord | ||
| uport |
| ZONES | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Number of Zones | 2 | 2 |
| Powered Zones | 2 | 2 |
| Zone 2 Outs | RCA Line Out | RCA Line Out |
| Whole House Mode | ||
| RS-232C Interface | ||
| +12V Trigger Output | 0 | 0 |
| Remote (IR) Input/Output | 0 / 0 | 0 / 0 |
| MISCELLANEOUS | 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 Languages | 7 | |
| 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 |
| Presets | 40 | 40 |
| Digital Radio | ||
| Internet Radio | TuneIn | TuneIn |
| Pandora | ||
| Spotify | ||
| Tidal | ||
| Deezer | ||
| Napster | ||
| SiriusXM |
| CONSTRUCTION | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Solid Aluminum Front | ||
| Speaker Terminals | 9 | 9 |
| Large Speaker Terminals | 9 | 9 |
| Color-Coded Speaker Terminals | ||
| Transparent High-Grade Speaker Terminals | ||
| Gold plated RCA terminals |
| POWER | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Power Supply | AC 120 V, 60 Hz | AC 120 V, 60 Hz |
| Independent Power Supply | 2 | |
| H.C.P.S. (High Current Power Supply) | Massive High Power Transformer | Massive High Power Transformer |
| Toroidal Transformer | ||
| Power Consumption | 580 W | 6.4 A |
| No Sound Power | 65 W | 70 W |
| Standby Power | 0.1 W | 0.1 W |
| Capacitor Bank | 8,200 µF | |
| ECO Mode / Hybrid Standby Function |
| PHYSICAL | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| 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" |
| Weight | 10.0 kg (22.0 lbs) | 9.4 kg (20.7 lbs) |
| SPECIFICATIONS | Onkyo TX-NR656 | Onkyo TX-NR646 |
|---|---|---|
| Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC) | 100 W (0.08% THD) | 100 W (0.08% THD) |
| Power Output (6 Ω, 1 kHz, 1 channel driven, FTC) | 170 W (0.9% THD) | 170 W (0.9% 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) | |
| Dynamic Power per Channel (3 Ω, Front) | 240 W | 240 W |
| Dynamic Power per Channel (4 Ω, Front) | 210 W | 210 W |
| Dynamic Power per Channel (8 Ω, Front) | 120 W | 120 W |
| THD | 0.08% (20 Hz - 20 kHz, Half power) | 0.08% (20 Hz - 20 kHz, Half power) |
| Damping Factor | 60 (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 kΩ | 3.5 mV/47 kΩ (Phono mm) |
| Rated Headphone Jack Output Level and Impedance | 330 Ω | |
| Rated Headphone Power Output | 90 mW (32 Ω, 1 kHz, 10% THD) | |
| Phono Overload | 70 mV (MM, 1 kHz 0.5%) | 70 mV (MM, 1 kHz 0.5% Direct) |
| S/N Ratio (Line, IHF-A) | 106 dB | 100 dB |
| S/N Ratio (Phono MM, IHF-A) | 80 dB | 80 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 HDMI | 2.8 MHz | 2.8 MHz, 5.6 MHz |
| DSD Sampling Rates via USB | 2.8 MHz, 5.6 MHz | 2.8 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 Response | 5 Hz - 100 MHz/+0 dB, -3 dB (Component) | |
| Ethernet Standard | 10BASE-T/100BASE-TX | 10BASE-T/100BASE-TX |
| Wi-Fi Standard | IEEE 802.11 a/b/g/n | IEEE 802.11 b/g/n |
| Wi-Fi Terminal Frequency | 5 GHz, 2.4 GHz | 2.4 GHz |
| Bluetooth Version | 4․1 + LE | 2․1 + EDR |
| Bluetooth Frequency | 2.4 GHz | 2.4 GHz |
| USB Terminal | 5 V, 1 A | 5 V, 1 A |
| FM Frequency | 87.5 MHz - 107.9 MHz | 87.5 MHz - 107.9 MHz |
| AM Frequency | 530 kHz - 1710 kHz | 522/530 kHz - 1611/1710 kHz |
| Warranty | 2 Years | 2 Years |
* - 480i/576i and 480p/576p only
** - 480i/576i only
*** - no 1080p/24 upconversion
**** - 1080p signal is not converted
For a full review please go to the review page:
