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Onkyo TX-NR646

7.2-channel home theater receiver with Wi-Fi®, Bluetooth®, Apple® AirPlay®, and Dolby Atmos®

Item # 580TXN646

If you've been waiting on setting up a home theater or upgrading your current setup, the Onkyo TX-NR646 might just...

If you've been waiting on setting up a home theater or upgrading your current setup, the Onkyo TX-NR646 might just...

Need help?
Contact our Virginia-based experts.
Discontinued item
28 questions - 56 answers

Item # 580TXN646

Need help?
Contact our Virginia-based experts.

About the Onkyo TX-NR646

See entertainment in a new light

If you've been waiting on setting up a home theater or upgrading your current setup, the Onkyo TX-NR646 might just be a game changer. With support for 4K Ultra HD video content, and decoding for Dolby Atmos and DTS:X, the latest multi-dimensional surround sound formats, this powerful receiver can springboard your living room into the future, making movies and TV super-lifelike and immersive. You'll also have quick access to just about any music source you can think of, with convenient playback and control through Onkyo's mobile Remote app.

See entertainment in a new light

If you've been waiting on setting up a home theater or upgrading your current setup, the Onkyo TX-NR646 might just be a game changer. With support for 4K Ultra HD video content, and decoding for Dolby Atmos and DTS:X, the latest multi-dimensional surround sound formats, this powerful receiver can springboard your living room into the future, making movies and TV super-lifelike and immersive. You'll also have quick access to just about any music source you can think of, with convenient playback and control through Onkyo's mobile Remote app.

Take your home theater above and beyond with Dolby Atmos and DTS:X™

A technology that just made its debut in home theater receivers last year, Dolby Atmos creates the most lifelike, captivating surround sound of any audio format we've heard to date. If you're watching a plane take off onscreen, your ears will follow it down the runway along with your eyes, and as it flies overhead you might swear your hair is blowing back as it roars directly above you. The TX-NR646 supports a 5.1.2 Atmos setup. If you're ready to explore this new dimension in home theater sound, you'll just need to add a pair of in-ceiling speakers to your five-channel system, or pick up a pair of Atmos enabled upward-firing speakers to project sound off your ceiling and create the height effects that make an Atmos system so riveting.

Onkyo will release a firmware update in the summer of 2016 that will give this receiver DTS:X surround sound, an upcoming format which will use object-based processing similar to Dolby Atmos and overhead speakers for immersive home theater.

Endless music streaming options

The TX-NR646's built-in Wi-Fi lets you access the music you have stored on your networked computer, plus you can take advantage of free Internet radio and other subscription-based Internet radio services like Spotify®, Pandora®, and SiriusXM® Internet radio. All of these options can be controlled with the Onkyo Remote app on your phone. Bluetooth lets you stream any music you listen to on your phone or tablet directly to the receiver for playback through your home speakers, and Apple AirPlay lets you send music wirelessly from a compatible Apple device or from any computer with iTunes®.

High-res audio

Great sound is key

Audio performance is at the heart of the TX-NR646's design. Onkyo's Wide Range Amplifier technology gives you smooth sound with minimal distortion for thrilling movie sound effects. Phase-matching Bass Enhancement lets you enjoy deep, thunderous low frequency effects while vocals and dialogue remain clear. Music aficionados will appreciate decoding for high-resolution DSD and FLAC files, along with other high-res formats. Onkyo's Music Optimizer helps improve the sound of compressed audio files and Bluetooth streams so you can hear your music the way it was meant to be heard. A premium 32-bit/384kHz (no, that's not a typo — color us impressed) digital-to-analog converter uses an exclusive low-distortion filtering technology to deliver crystal-clear reproduction of music and TV and movie soundtracks.

Enjoy your music in a second room

Ever wish you had a dedicated music listening room? It isn't hard to set one up with the TX-NR646's dual-zone audio capabilities. Powered Zone 2 outputs let you connect a pair of speakers for stereo sound in another room. You can also connect a stereo receiver through the line-level Zone 2 connection and use the 'NR646 as a preamp. Whole House Mode lets you play the same song in all zones, or you can listen to a different song in each room. Use the Onkyo Remote app to control audio content in different zones from anywhere in the house.



    Power and Processing:
    • 7-channel amplifier
    • 100 watts per channel into 8 ohms (20-20,000 Hz) at .08% THD, with 2 channels driven
    • Dolby® and DTS® surround sound decoding
      • Dolby Atmos® processing for use with in-ceiling or "height" speakers for more enveloping surround sound
      • DTS:X™ for an immersive, 3-dimensional soundstage (available via Summer 2016 firmware update)
    • Advanced AccuEQ automatic speaker calibration optimizes your system's sound for your room (microphone included)
    Digital and Streaming Music Options:
    • built-in Wi-Fi for listening to music from a networked PC, free Internet radio, and music services
      • includes support for Pandora, Spotify, SiriusXM, Slacker®, TuneIn, and Aupeo! (subscription required for some services)
    • built-in Bluetooth for wireless music streaming from a compatible smartphone, tablet, or computer
    • Apple AirPlay for streaming music from an iPhone®, iPad®, iPod touch®, or computer running iTunes
    • DLNA-certified for streaming music with compatible devices and computers
    • plays high-resolution digital music files via USB storage device or a networked computer (up to 24-bit/192kHz resolution)
    • plays DSD files (up to 5.6 MHz .dsf files) from network and USB storage devices
    Multi-room Audio:
    • dual-room/dual-source output
      • powered stereo audio output for 2nd room
      • using powered 2nd-room output allows 5.1 home theater in main room
      • line-level 2nd-room output for use with a separate amplifier or powered speakers
    Audio Performance Features:
    • high-current amplifier design with large power transformer
    • 32-bit/384kHz Asahi Kasei AK4458 digital-to-analog converter for clear sound from digital sources
    • Music Optimizer function enhances the sound quality of compressed music files and Bluetooth streams
    • bi-amp capability with compatible front speakers by reassigning "surround back" channels
    • HDMI 2.0a audio/video switching: 8 in, 2 out (includes front-panel input)
      • HDCP 2.2 technology ensures compatibility with 4K Ultra HD sources and TVs (HDMI inputs 1, 2, 3, and monitor output only)
      • HDR-compatible for extended picture contrast and brightness with compatible 4K TVs and HDR-encoded content
    • component video switching: 2 in
    • composite video switching: 3 in
    • digital audio inputs: 2 optical and 1 coaxial
    • 7 analog stereo audio inputs
    • phono input for direct connection of a turntable
    • preamp outputs for 2 powered subwoofers
    • rear-panel USB port for audio playback from USB storage devices
    • Ethernet port for network connection
    • outputs for 9 speakers (Front L/R, Center, Surround L/R, Surround Back L/R, Zone 2 L/R)
    • receiver can power a maximum of seven channels at once
    General Features:
    • free Onkyo Remote app lets you use your Apple or Android™ device as a Wi-Fi remote
    • 4K/60p and 3D video pass-through
    • HDMI standby pass-through allows access to all HDMI connected devices without having to power on the receiver
    • Audio Return Channel function receives digital audio signals from a compatible TV's tuner via HDMI
    • Phase-Matching Bass optimizes low frequencies to preserve clarity with vocals and movie dialogue
    • 40 AM/FM presets
    • remote control
    • 17-1/8"W x 6-13/16"H x 13-5/8"D
    • weight: 20.7 lbs.
    • warranty: 2 years
    • Our 60-day money-back guarantee
    • MFR # TX-NR646

    What's in the box:

    • 7.2ch AV receiver
    • Wireless remote control (RC-898M)
    • 2 "AA" batteries
    • Setup microphone
    • AM loop antenna
    • FM wire antenna
    • Basic Manual
    • DTS:X Firmware Update Note
    • Product registration card/Warranty information
    • Important Safety Instructions

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    More details on the Onkyo TX-NR646

    Stacey B.

    Features & specs

    Number Of Channels 7
    Stereo RMS Power (watts) 100
    THD in Stereo 0.08 %
    Frequency Bandwidth (stereo) 20-20k Hz
    Minimum Impedance L/R 6 ohms
    Minimum Impedance Center 6 ohms
    Minimum Impedance Surround 6 ohms
    General Features
    Bluetooth Built-in
    Apple AirPlay Built in
    Alexa-compatible No
    Google Assistant-compatible No
    Chromecast built-in No
    DTS Play-Fi No
    App Remote Control Yes
    On-Screen Display Thru HDMI
    Auto Speaker Calibration AccuEQ
    Multi-room Audio/Video
    Powered Multi-room Audio Output Yes
    Preamp Multi-room Audio Output Yes
    Multi-room HDMI Output No
    Total Number of Zones 2
    Playback from Digital Audio Inputs Yes
    Playback from Streaming Sources Yes
    Surround Processing
    Dolby Digital DD, TrueHD, DD+, EX
    Dolby Atmos Yes
    Dolby Atmos Height Virtualization ---
    DTS DTS, HD, HDMA, ES, Neo6, 96/24
    DTS:X Firmware update
    DTS Virtual:X ---
    Inputs & Outputs
    Phono Input 1
    Audio-Video Inputs 8
    Audio-only Inputs 1
    Component Video Inputs 2
    Component Video Monitor Outputs None
    Optical Digital Inputs 2
    Coaxial Digital Inputs 1
    Optical Digital Outputs None
    Coaxial Digital Outputs None
    Number of HDMI Inputs 8
    HDMI Monitor Outputs 2
    Subwoofer Outputs 2
    Discrete Subwoofer Outputs No
    Multi-Channel Analog Input No
    Multi-channel Preamp Output No
    Main Speaker Output Pairs Posts
    Main Speaker Terminals Posts
    Ethernet Port ---
    USB Connections 1 Rear
    Removable Power Cord No
    Supports Wireless Rear Speakers No
    HDMI Features
    HDMI Version 2.0
    VRR (Variable Refresh Rate) No
    ALLM (Auto Low Latency Mode) No
    4K/120Hz-Capable Inputs No
    Audio Return Channel ARC supported
    Video Upscaling No
    HDR (High Dynamic Range) Support
    HDR10 No
    HDR10+ No
    HLG No
    Dolby Vision No
    Other Specs
    FM Sensitivity Not Given
    Multibrand Remote Control Yes
    Learning Remote No
    Width (inches) 17.125
    Height (inches) 6.8125
    Depth (inches) 13.625
    Weight (pounds) 20.7
    Parts Warranty 2 Years
    Labor Warranty 2 Years
    The Onkyo TX-NR646 replaces these items:

    Product Research

    Audio Section
    Video Section
    Network/USB/Tuner Functions
    Convenience Features
    Bluetooth + Remote Control

    Audio Section

    7 Channel Amplifier: The Onkyo TX-NR646 AV receiver features a 7-channel amplifier rated at 100 watts (into 8-ohms, at 20Hz-20kHz, with 0.08%, driving 2 channels). The AV receiver's amplifier employs WRAT, H.C.P.S, PLL Jitter-Cleaning Circuitry, and Optimum Gain Volume Circuitry for dynamic, detailed, clear sound.

    • WRAT (Wide Range Amplifier Technology): WRAT is based around a low negative-feedback circuit topology that works to reduce signal noise and distortion across the frequency range. A "closed ground-loop circuit" design is employed, in which each circuit has a separate link to the power supply. This helps to cancel individual circuit noise and keep the ground potential free of distortion. High Instantaneous Current Capability (HICC) enables WRAT amplifiers to immediately cancel the speakers' reflex energy and instantaneously send out the next signal. The same high current better manages speaker impedance fluctuations, which can negatively affect performance.
    • H.C.P.S. (High Current Power Supply): Under the anti-resonant cover of any Onkyo receiver, you'll instantly notice the High Current Power Supply (H.C.P.S.) transformer. With its huge, isolated power supply design and high-capacity filter capacitors, it delivers the large amounts of power necessary for reproducing the wide dynamics of movie soundtracks and the detail and clarity of your music.
    • Optimum Gain Volume Circuitry: Optimum Gain Volume Circuitry adjusts the gain so that less than half the amount of attenuation is needed, ensuring the signal never comes close to the noise floor. This protects the signal against noise, resulting in a dramatically clearer sound.
    • PLL Jitter-Cleaning Circuit Technology: PLL (Phase Locked Loop) jitter-cleaning circuit technology reduces jitter by comparing the input and output phases of the digital signal and creating an accurate clock waveform. This enhances the precision of digital signal processing and noticeably improves audio quality. Jitter-cleaning technology works both for digital signals input via HDMI and for digital signals converted from analog signals inside the receiver itself

    Amplifier Assignment: The 7-channel amplifier can be configured in a variety of ways to match your type of speaker setup.

    • Normal (7.1ch): The Onkyo TX-NR646 provides 7.1ch surround in your main listening area. You can choose either Surround Back or Front Height speakers (but not both).
    • Front Bi-Amp (5.1ch): The Surround-Back/Front-High speaker terminals can be reassigned and used along with the Front terminals to bi-amp the front speakers, providing improved bass & treble performance. When bi-amping the front speakers the receiver is limited to a 5.1ch speaker system in the main room (no Surround Back or Front Height speakers)
    • Powered Zone 2 (7.1ch + Zone 2): In this configuration, you can connect Front, Center, Surround, Surround Back (or Front Height), and Zone 2 speakers to the AV receiver. When Zone 2 is off, all seven channels will be used in the Main Zone. However, when Zone 2 is on, power to the two surround back (or front height) channels will be directed to the two speakers in Zone 2 and the Main Zone will receive only five channels of power.
    • Dolby Atmos (5.1.2ch): The Surround-Back/Front-High speaker terminals are assigned to power a pair of overhead ceiling speakers or a pair of Dolby Atmos-enabled speakers to create 5.1.2ch Dolby Atmos surround sound. Zone 2 speaker can still be powered by the receiver in the configuration. When Zone 2 is off, all seven channels will be used in the Main Zone for Dolby Atmos. However, when Zone 2 is on, power to the Dolby Atmos channels will be directed to the two speakers in Zone 2 and the Main Zone will receive only five channels of power without Dolby Atmos.

    384 kHz/32-bit Hi-Grade DAC: A premium-quality AK4458 digital-to-analog converter from Asahi Kasei implements unique low-distortion filtering technologies for clear sound, and unlocks the full potential of any audio format, including compressed, lossless, and hi-res audio (MP3, WMA, WMA Lossless, FLAC, WAV, OggVorbis, AAC, Apple Lossless, DSD 5.6 MHz, LPCM, and Dolby TrueHD).

    Dual 32-Bit DSP: The Onkyo AV receiver employs powerful and highly accurate Dual 32-bit processing DSP's (Digital Signal Processor) for better surround sound reproduction.

    AccuEQ Room Calibration: Calibrating the sound to suit your room's acoustics is simple with Onkyo's AccuEQ auto-room calibration. Once you've connected your speakers, plug-in the included mic and wait a few moments as the TX-NR646 measures things such as speaker distance, type, crossover, and output, taking into account any reflections from your walls and floor. The system is designed specifically to by-pass your front left and right speakers. The system then optimizes the frequency response of the remaining speakers so you can enjoy balanced surround sound regardless of room shape or furnishing while retaining the characteristics of your front left and right speakers for optimum enjoyment

    Multi-Channel Decoding Formats: The Onkyo TX-NR646 AV receiver supports the following multi-channel (Dolby Digital, DTS, Dolby Pro Logic) decoding formats.

    Note: Dolby Digital and DTS listening modes can only be selected if your audio source is connected to the A/V receiver via a digital audio connection (HDMI, optical, or coaxial). To enjoy true 7.1ch Dolby Digital TrueHD and DTS-HD surround sound, the receiver must be connected to your Blu-ray player via HDMI.

    Immersive Surround Sound: The Onkyo TX-NR646 AV receiver goes beyond regular surround with the latest immersive surround sound formats - like Dolby Atmos, Dolby Surround, and DTS:X.

    • Dolby Atmos: The TX-NR646 receiver is Dolby Atmos (5.1.2ch) compatible. Dolby Atmos combines traditional home theater speaker layouts with either ceiling-mounted speakers or new Dolby Atmos-enabled speakers to create a plane of sound above the listener. The impact of either in-ceiling or Dolby Atmos-enabled speakers is breathtaking. Your room fills with realistic, multidimensional sound that places you directly in the center of the entertainment experience.
    • Dolby Surround: Dolby Surround offers an enhanced cinema experience to your Dolby Digital (Plus/TrueHD) and DTS (ES/HD) movie soundtracks using your existing 7.1ch or Dolby Atmos speaker setup. Dolby Surround enhances audio definition by improving the spatial dimension and overall audio definition of movie soundtracks. It does this by using four distinct surround zones that provide greater control over the exact placement of each detail in a movie sound track, so audio can be matched more accurately to the video on screen; this means more depth and greater realism for your movies. As a result, individual sounds are clearer and more distinct. It also improves the surround sound experience across the entire theater by widening the listening "sweet spot".
    • DTS:X (Future Firmware Update): DTS:X will be enabled through an online firmware update later this year. DTS:X is the next generation object-based, multi-dimensional audio technology from DTS. Unbound from channels, DTS:X conveys the fluid movement of sound to create an incredibly rich, realistic and immersive soundscape - in front of, behind, beside and above the audience - more accurately than ever before. DTS:X offers the ability to automatically adapt the audio to the speaker layout that best fits your space.
    • DTS:X Neural (Future Firmware Update):  DTS:X Neural will also require the same future firmware upgrade as DTS:X. Further, DTS:X incorporates Neural:X, the latest spatial remapping technology from DTS, which provides a fully immersive output for all types of source content; this includes DTS bitstreams and non-encoded (PCM) data. Neural:X delivers a thrilling sense of immersive sound to your speaker layout regardless of the original source format. Click here for more information about DTS:X & DTS:X Neural.

    Onkyo Original DSP Modes: Onkyo's Original DSP Modes, combined with Dolby Digital/DTS/Dolby Pro Logic processing, produce more realistic, powerful sound effects for your movie and music sound tracks based on the type of content and your home theater setup. You can choose from the following:

    • Orchestra: For classical or operatic music.
    • Unplugged: For acoustic instruments, vocals, and jazz.
    • Studio-Mix: Suitable for rock or pop.
    • TV Logic: Adds realistic acoustics to TV shows.
    • Game: The receiver offers four different Gaming modes - RPG, Action, Rock, and Sports.
    • All Ch Stereo: Stereo sound from all speakers. Ideal for background music.
    • Full Mono: All speakers output the same sound in mono.
    • Theater-Dimensional (T-D): Theater-Dimensional circuitry takes the complexity out of conventional surround-sound setups and lets you experience the excitement of surround sound from as few as two ordinary speakers. Theater-Dimensional's unique multi-speaker modes let you place up to five speakers conveniently by the TV, for the most realistic virtual-surround sound possible.

    Direct Mode: In Direct mode, audio from the input source is output without surround-sound processing. This mode delivers pure sound with minimum sound quality adjustment and filtration.

    Surround Parameters: The Onkyo TX-NR646 lets you tweak and fine tune specific surround sound modes to suit your preference.

    • Dolby Pro Logic II Music Settings: While listening in the Dolby Pro Logic II Music format, there are three further enhancements you can adjust; Panorama: (broadens the front stereo image to the surround speakers to provide a wraparound effect), Dimension (allows you to move the sound field forward or backward), and Center Width (allows you to adjust the width of the center channel).
    • Center Image: In the Neo:6 Music mode, the Center Image feature adjusts the output of the left and right channels relative to the center channel, allowing you to make the center channel more or less dominant as needed. This improves the image of the center channel, especially when the listener is off-center. Adjustment varies from 5 (nothing subtracted from the L/R channels) to 0 (L/R channel output is cut in half).
    • Center Spread: Adjusts the width of the soundfield of the front channels when playing in the Dolby Surround listening mode.
    • Listening Angle: While listening in the Theater Dimensional mode you can adjust the listening angle to either Wide (if listening angle is 40°) or Narrow (if listening angle is 20°).

    Audio Enhancements: The Onkyo TX-NR646 receiver provides various audio enhancements to deliver a high-quality listening experience every time.

    • CinemaFilter: Using the CinemaFilter you soften overly bright movie soundtracks. Movie soundtracks are typically mixed for a large theater (relative to your home theater) with lots of soft seats and thick curtains on the walls. Home theater settings often lack these high frequency absorbing wall treatments, making the soundtrack sound too bright. CinemaFilter accounts for this and for many movies sounds more natural at home.
    • Music Optimizer: The Music Optimizer function enhances the sound quality of compressed music files. The Music Optimizer function only works with PCM digital audio input signals with a sampling rate below 48kHz, analog input signals, and Bluetooth audio.
    • Late Night Feature: The Late Night feature limits the dynamic range of Dolby Digital recordings. Limiting the dynamic range makes it easier to find a volume that ensures the quiet sounds are not too quiet and the loud sounds are not too loud for night time listening. This allows you to comfortably listen to without the need to constantly adjust the volume to keep from waking family/neighbors. The choices are: Off, Low, and High. This feature only works with Dolby Digital Encoded software and the depth of the feature will vary based on the individual software package.

    Bass Management: The Onkyo AV receiver offers Tone Control and Phase Matching Bass technology to get the most bass impact out of your system.

    • Tone Controls: You can independently adjust the Bass (50Hz) and Treble (20kHz) of the TX-NR646 from -10 to +10 dB.
    • Phase Matching Bass: Onkyo's Phase-Matching Bass optimizes low frequencies while preserving mid-range clarity. This means that powerful bass plays back with clear vocals; it doesn't overpower them.
    • Double Bass: You can also activate the Double Bass function in order to boost bass output even more by feeding bass sounds to the front left/right speakers, center-channel, and powered subwoofer.

    Volume Setup: The Onkyo AV receiver provides the following volume settings.

    • IntelliVolume: With IntelliVolume, you can set the input level for each input (+/-12dB) selector individually. This is useful if one of your source components is louder or quieter than the others. This function does not work in Zone 2.
    • Maximum Volume: Use this feature to set the receiver's maximum volume level. This feature is useful to avoid turning the volume too loud by mistake. You can set the Max Volume from 30-79 (max), or Off (disabled).
    • Power On Volume: Use this feature to set the volume level when the power is turned on. You can choose between Last (same as the volume when the unit was turned off), Min (0), or 1-79.
    • Headphone Level: With this setting, you can specify the headphone volume (+/-12dB) relative to the main volume. This is useful if there's a volume difference between your speakers and your headphones.

    Audio Inputs/Outputs: The Onkyo AV receiver offers a variety of analog and digital audio inputs/outputs.

    • Digital Inputs: The Onkyo receiver is equipped with two optical digital inputs and one coaxial digital input. All three digital inputs are assignable. You can choose auto decoding , PCM, or DTS for the digital audio inputs. Auto will decode the signal in its original form (Dolby Digital, DTS, PCM, etc), PCM decodes the signal to 2-channel, while DTS decodes only DTS formatted sources.
    • Phono Input: The Onkyo AV receiver is fitted with a Phono input and ground terminal for connection of a turntable (MM).
    • Binding-Post Speaker Terminals: There are binding-post terminals for all speaker connections - Front, Center, Surround, Surround Back/Front Height, and Zone 2. The binding post terminals will accept bare-wire, pin-connectors, and banana plugs (single/dual). Use 6- to 16-ohm speakers.
    • Dual Subwoofer Outputs: The receiver is fitted with two subwoofer outputs to connect dual powered subs for extra bass. The dual outputs share the same input signal and are not discrete.
    • Headphones: When headphones are plugged into the full-size 1/4" jack on the front panel, all the speakers are automatically muted.

    Video Features

    HDMI 2.0a: The TX-NR646 has eight HDMI 2.0a inputs (7 rear/1 front) and two HDMI 2.0a outputs for connecting Blu-ray/DVD players, Satellite/Cable boxes, Game Consoles, and other video components to your TV. The dual HDMI outputs can simultaneously output the same audio/video signal to two TVs (video is output at the resolution supported by both TVs). The HDMI jacks can accept and switch 480i, 480p, 720p, 1080i, 1080p, or 4K video signals to a HDTV. All HDMI jacks will also support uncompressed standard or high definition digital video along with the following audio signals; 2-channel linear PCM, Multichannel linear PCM (up to 7.1ch), and Bitstream (Dolby Digital/DTS, etc.). Additional HDMI features include -

    • 4K (60Hz)/HDCP 2.2/4:4:4: The receiver's HDMI jacks supports the latest HDMI 2.0a specifications, plus HDCP 2.2 compatibility for the latest formats and technologies planned for Hollywood content (HDCP 2.2 is only supported onl HDMI 1/2/3 inputs and both HDMI outputs). HDMI 2.0a offers a significant increase in bandwidth (up to 18Gbps) to support new features such as 4K@50/60 (2160p), which is 4x the clarity of 1080p/60 video resolution, and 4:4:4 color space for uncompressed color real-life color.
    • HDR (High Dynamic Range): This Onkyo AV receiver also enables transmission of High Dynamic Range (HDR) formats, and provides enhanced picture quality by simultaneously enabling greater detail for both the dark and bright parts of an image.
    • 3D-Ready: All HDMI jacks will accept 3D video from your 3D-ready Blu-ray player and output the video signal in 3D to your 3D-ready flat-panel television.
    • ARC (Audio Return Channel): The receiver's main HDMI output features ARC (Audio Return Channel). This feature allows audio to be sent from your compatible HDTV to your receiver through the same HDMI cable already being used to send audio and video to your HDTV. This eliminates the need for extra cables connected to your television. The sub HDMI monitor output does not support this feature.
    • Auto Lip-Sync: The Lip-Sync function can automatically synchronize HDMI audio and video (for any HDMI jack) that has gotten out of sync due to the complex digital video processing being performed by your HDMI-compatible TV. With HDMI Lip-Sync, the audio delay required to synchronize the audio and video is calculated and applied automatically by the AV receiver. You can also manually correct the audio delay from 0 (no delay) to 400 milliseconds; in 10 millisecond steps.

    Video Conversion: Analog composite and component video signals (480i only) input to the receiver will be converted to HDMI signals and then output to your receiver via HDMI. The resolution remains the same and is not upscaled.

    HDMI Through: When enabling the HDMI Through function, regardless of whether the AV receiver is "on" or in "standby" both audio and video streams from an HDMI input will be output to your television, via the receiver HDMI monitor output. You can select between 3 HDMI Through functions modes.

    • Auto: Detects the signal and automatically selects the input sources.
    • Source: Selects the input source (BD/DVD, VCR/DVR, CBL/SAT, Game, PC, Aux, TV/CD, Port) for which the HDMI Through function in enabled.
    • Last: The HDMI Through function is activated on the input source selected at the time of setting the AV receiver to the "standby" mode.

    Analog Video Inputs: The receiver features three composite video inputs and two component video inputs which support 480i video signals only. All analog video input signals are converted to digital and sent via HDMI to your TV.

    Video Select: It is possible to play audio and video from different sources. For example, you can play audio via Bluetooth and video from your BD/DVD player. This function is only effective when an input with audio only (Network, Bluetooth, or Tuner) has been selected initially.

    Network/USB/Tuner Functions

    Wired or Wireless Network Connection: The Onkyo TX-NR646 AV receiver supports a wired or wireless network connection. Via the AV receiver's network connection, you can enjoy music files stored on your computer and listen to internet radio through a variety of online services.

    • Ethernet (LAN) Jack: The Onkyo AV receiver is equipped with an Ethernet (RJ-45) jack for connecting the player to your home network and computer. Connecting the A/V receiver's Ethernet port to a 100Base-TX switched Ethernet network is recommended for best results. Use a shielded CAT-5 Ethernet cable to connect the receiver to your home network.
    • Built-in Wireless LAN: The AV receiver also features built-in WiFi that allows you to wirelessly connect to your home network, so you can enjoy the benefits of a cable-free network environment. A wireless connection requires a home network with a WiFi-enabled access point (IEEE 802.11 b/g/n). Supports WPS, WEP, and WPA security.
    Note: Network setup requires that the receiver be connected to your TV via HDMI for display of the on-screen menu. The receiver's network setup cannot be accessed through its front-panel display.

    Internet Radio: The Onkyo TX-NR646 lets you access various Internet Radio providers through its wired or wireless network connection. The TX-NR646 will display station name and program-related information; such as artist name, song/album title, and elapsed playing time. You can preset up to 40 of your "favorite" Internet radio stations for easy recall.

    Music Service Description
    TuneIn With more than 70,000 radio stations and 2 million on-demand programs registered, TuneIn is a service where you can enjoy music, sports and news from all over the world.
    Pandora Pandora is a free, personalized Internet radio service that plays the music you know and helps you discover music you'll love. You can select Internet radio stations by Artist, Song, or Genre.
    Spotify Connect If you subscribe to Spotify Premium and have the Spotify App on your Apple iOS or Android smartphone, you can stream Spotify to the Onkyo receiver. Spotify is a digital music service that gives you on-demand access to one of the largest music libraries in the world (over 15 million tracks and counting). Spotify makes it easier than ever to discover, manage, and share music with your friends. You can browse music by artist, album, track, or most popular; and create your own music library with customized playlists.
    SiriusXM SiriusXM Internet Radio lets you listen to over 120 channels of commercial-free music, talk radio, news, sports, and more.
    Slacker Slacker is a free, personalized Internet radio service that lets you choose the music you want to listen to. You can choose Internet radio stations by genre, or create custom station by Artist name or Song title.

    AirPlay Compatible: AirPlay lets you stream your favorite songs directly from your Apple iOS (4.3.3+) device or from your iTunes (10.2.2+) library on your Windows PC or Mac computer to the AV receiver, over your home's wireless network connection. From your Apple iOS device you are able to stream stored music on your device, downloaded music apps, and music on your iCloud to the AV receiver. From your Windows or Mac you can stream your stored iTunes music library on your computer to the AV receiver; you can even download Apple's free Remote App onto your compatible iOS device to browse and control playback functions of the music stored in your iTunes music library on your computer that is being streamed to the AV receiver. With AirPlay you also get to see song/artist information and album art via the receiver's on-screen menu (via HDMI).

    Streaming Music Files: You can stream a variety music files from your Windows PC, DLNA-certified music server, or a USB mass storage class device.  Compatible music file formats include MP3 (8-320kbps; 16-48kHz), WMA (47-320kbps), WMA Lossless (16/24-bit; 44.1-96kHz), WAV (8/16/24-bit; 8-192kHz), AAC (8-320kbps; 8-96kHz), FLAC (8/16/24-bit; 8-192kHz), Apple Lossless (16/24-bit; 8-96kHz), Ogg Vorbis (48-500kbps; 8-48kHz), DSD (2.8MHz/[5.6MHz DLNA only]), and LPCM (16-bit; 44-48kHz). You can control basic playback functions of your music library from the included remote control and receiver's on-screen menu; such as Folder/File Select, Play/Pause, Stop, Fast Forward/Rewind, Previous/Next Track, and Repeat/Random. A total of 20,000 music files/folders is supported.

    • DLNA Certified: Because the TX-NR646 is DLNA certified, you can play back music files stored on your Windows  PC (w/ Windows Media Player 11 or 12) or a DLNA (ver.1.5) compatible media server through the AV receiver. Playback control can be done from the receiver's remote control or your DLNA-certified computer/server.
    • USB Mass Storage Class: This AV receiver is equipped with a rear-panel USB (type-A) port that allows you to enjoy a variety of music files from a USB mass storage class memory device; such as your Android smartphone (Froyo/Gingerbread OS only), portable MP3 player, or USB thumbdrive (all formatted in FAT 16/32). USB portable audio players that can be charged via USB will be charged when plugged into the AV receiver's USB port (5V/1A); even in standby mode. USB hubs and USB devices with hub functions are not supported. MP3 players containing music files that are managed with special music software are not supported. Apple iPod/iPhone/iPad and newer Android devices are not supported via USB.

    AM/FM Tuner: With the built-in tuner you can enjoy AM and FM radio stations. You can store your favorite stations as presets for quick selection. You can store a combination of up to 40 of your favorite FM/AM radio stations as presets. You can also tune directly to a specific station by using the numeric keypad on the included remote control.

    Firmware Updates: Future firmware updates are available from the Onkyo website through the receiver's Network or USB connection. Visit Onkyo's online Download Center for the latest firmware updates.

    Convenience Features

    On-Screen Menu w/ Setup Assistance (HDMI only): The Onkyo AV receiver offers an on-screen (GUI) menu system through its HDMI output. The simple on-screen display combines text and graphics that make setup and other operations extremely easy. The initial setup assistant takes you step-by-step through speaker configuration, source connection, remote programming, and network connection.

    Note: Initial setup requires that the receiver be connected to your TV via HDMI for display of the on-screen menu. Many of the receiver's setup functions can only be found via the on-screen menu and not the front-panel display.

    Zone 2: In addition to the main listening room, you can also enjoy audio playback from a different source in another room of your home using the receiver's Zone 2. The receiver features Zone 2 line-outputs, as well as Zone 2 speaker terminals. By using the line-level outputs on the TX-NR646 you can connect an external receiver or integrated amplifier in a second room, allowing you to listen to 7.1ch surround in the main room and play a different audio source in another room of your home. By using the speaker-level outputs on the TX-NR646, you can directly connect a secondary pair of speakers in another room of your home, allowing you to listen to 5.1ch surround sound in your main room and play a different audio source in the other room. The volume of Zone 2 is controlled from the receiver when using the speaker outputs and from your add-on integrated amp when using the line-level outputs.

    • Compatible Zone Sources: Only Tuner, Analog, Optical/Coax Digital (2Ch PCM only), USB, Network (not DSD), and Bluetooth audio sources can be sent to Zone 2.
    • Incompatible Zone Sources: HDMI audio/video sources are not output to Zone 2. You cannot output any analog video signal to Zone 2.
    Note: As for Network and Bluetooth sources; you cannot select different inputs for the main room and Zone 2. For example, if a Network source been selected in the main room and then Bluetooth is selected as playback source in Zone 2, the input in the main room will also change to the Bluetooth source. When listening to AM/FM radio, you cannot select different stations for the main room and Zone 2.

    Gapless Playback: Many live and classical albums have no gaps in the music. Gapless playback ensures that there are no pauses between audio files. This provides playback with no interruptions, the way it was meant to be heard. Compatible with WAV, FLAC, and ALAC music files via USB or DLNA.

    Name Edit: You can enter a custom name for each individual input selector and radio preset for easy identification. When entered, the custom name will appear on the display. This function cannot be used for the AM/FM, Network, USB, and Bluetooth input selectors.

    Display Dimmer: The front-panel display brightness has three settings - Dim, Dimmer, and Normal.

    Timers: The receiver features a programmable Sleep Timer, Auto Standby function, and Screen Saver.

    • Auto Standby: The AV receiver will automatically go into Standby mode, if there is no operation for 20 minutes with no audio/video signal input.
    • Sleep Timer: From the remote, you can set the unit to automatically turn off after as much as 90 minutes or as little as 10 minutes; choices are presented in 10 minute increments.
    •  Screen Saver: If there is no video signal on the current input source and no operation for a specific time, a screen saver automatically comes on. You can set the time (3min/5min/10min/off) until the screen saver activates itself. Once active, the screen saver will go off and the screen will return to its previous state if the AV receiver is operated in any way.

    Bluetooth + Remote Control

    Built-in Bluetooth: The Onkyo TX-NR646 features built-in Bluetooth (version 2.1+EDR) with support for profiles A2DP 1.2 and AVRCP 1.3. You'll be able to wirelessly stream music from your Bluetooth-enabled Apple iPod/iPhone/iPad, Android smartphone/tablet, Windows Phone/PC, or Mac laptop/computer to the Onkyo receiver. You will also be able to control basic playback functions (Play/Pause, FF/RW, Skip) using the receiver's remote control. Advanced music operation will still need to be handled from your Bluetooth-enable device. There is no song/artist information display on the receiver or connected TV. Continue to use your Bluetooth device's screen to view song/artist info.

    Note: Due to the differences in Bluetooth technology, some Bluetooth enabled devices may be incompatible, function improperly, or may not support all features when used with the Onkyo receiver.

    Onkyo Remote App (for Apple iOS & Android): The Onkyo Remote App (from Apple's App Store & Google Play) allows you to operate the Onkyo AV receiver from your Apple iOS (4.3+) or Android (2.1+) device, using your home's wireless network. The Onkyo Remote App lets you you access Internet Radio stations, AM/FM stations, DLNA content, and Input sources right from your mobile device. Content information will be displayed on the device's touchscreen. You also get to adjust tone controls, listening modes, and speaker volume from your compatible Apple iOS or Android device. The Onkyo Remote App even allows you to wirelessly stream audio stored on your Apple iOS or Android device to the Onkyo AV receiver and lets you control audio output for up to two Zones. The Onkyo AV receiver and and your compatible Apple iOS or Android device must be connected to the same home network.

    Multi-brand Remote: The receiver comes with an IR remote control for wireless operation of this receiver and other HDMI-connected sources (via HDMI CEC). In addition to the receiver, the remote can be programmed using the receiver's on-screen menu to control popular brands of TVs, Blu-ray players, DVD players/recorders, DVRs, VCRs, etc.

    HDMI Control: This function allows HDMI-CEC compatible components or RIHD-compatible components connected via HDMI to be controlled with the TX-NR646 . The AV receiver offers the following HDMI-CEC controls.

    • The AV receiver will enter Standby mode when the power of the TV is turned to Standby.
    • You can set on the menu screen of the TV to either output the audio from the speakers connected to the AV receiver, or from the speakers of the TV.
    • It is possible to output the audio/video from the antenna or from the input jack of the TV from the speakers connected to the AV receiver.
    • Input to the AV receiver can be selected with the remote controller of the TV.
    • Operations such as volume adjustment or similar for the AV receiver can be performed from the remote controller of the TV.

    RI Remote Control Jack: The 1/8" RI remote control jack allows you to connect this receiver to other compatible Onkyo components.

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    Customer Q&A

    28 questions already asked

    Can anyone recommend a suitable and cost effective sub-woofer to go with this?
    [ Victor  Aug 30, 2016 ]
    1 answer
    Thanks for your question. For information on selecting the best sub I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the sub models and help you make the best choice for your system and your budget.
    [ Kenny  Aug 31, 2016 ]  Staff
    Can the amplifier support two 320 Watts speakers?
    [ Cam2496  Aug 30, 2016 ]
    1 answer
    The Onkyo can power up to seven conventional 8 Ohm home speakers with up to 100 watts each, yes. While a speaker may be "rated" to handle more wattage, the Onkyo should be more than enough power for any consumer-grade application. I hope that helps. My Bio:
    [ Ryan  Sep 03, 2016 ]  Staff
    I recently bought four speakers and a sub-woofer; the Polk TSx220 and Polk PSW125 respectively. Are these speakers and sub compatible with this receiver?
    [ Jim  Jul 29, 2016 ]
    1 answer
    Absolutely. There's nothing proprietary about the Polk speakers. The bookshelf models are the conventional 8 Ohm impedance and the receiver offers the dedicated subwoofer RCA pre-out for providing bass frequencies to the powered subwoofer. I hope that helps. My Bio:
    [ Ryan  Jul 30, 2016 ]  Staff
    Does this receiver, or any other that you're aware of capable of "Bluetooth out" to send music to a pair of Bluetooth headphones? Thanks in advance!
    [ benny  Jul 26, 2016 ]
    1 answer
    This model cannot, no. Any of the Yamaha models that offer their "MusicCast" feature will have built-in Bluetooth than can be paired with Bluetooth headphones or a Bluetooth capable speaker. I hope that helps! My Bio:
    [ Ryan  Jul 29, 2016 ]  Staff
    Does this receiver have a default sound volume for input modes?
    [ Kit  Jul 13, 2016 ]
    1 answer
    Yes: The Onkyo AV receiver provides the following volume settings. IntelliVolume: With IntelliVolume, you can set the input level for each input (+/-12dB) selector individually. This is useful if one of your source components is louder or quieter than the others. This function does not work in Zone 2. Maximum Volume: Use this feature to set the receiver's maximum volume level. This feature is useful to avoid turning the volume too loud by mistake. You can set the Max Volume from 30-79 (max), or Off (disabled). Power On Volume: Use this feature to set the volume level when the power is turned on. You can choose between Last (same as the volume when the unit was turned off), Min (0), or 1-79. Headphone Level: With this setting, you can specify the headphone volume (+/-12dB) relative to the main volume. This is useful if there's a volume difference between your speakers and your headphones. You will find this information, and more, by clicking the "Details" tab on the receiver's main webpage and scrolling down below the "Features & Specs" table. I hope that helps! My Bio:
    [ Ryan  Jul 16, 2016 ]  Staff
    I have a slight audio delay and can't figure out a way to adjust this on the receiver. Is there a way to adjust this? If so, can someone walk me through it? The delay is there whether I am watching a BD or Dish.
    [ COLBY  Jun 28, 2016 ]
    1 answer
    If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center:
    [ Krissy  Jun 29, 2016 ]  Staff
    I saw some reviews on Amazon and elsewhere indicating that Zone 2 speakers can be used for analog sources only, but other Q&As here indicate that they can be used with some digital sources (e.g., pandora/wifi). I need to be able to listen to spotify over four speakers- will this receiver allow me to?
    [ Greg  Jun 26, 2016 ]
    2 answers
    Sorry. I only use this for a single theater room. Wish I could be of better help.
    [ COLBY  Jun 28, 2016 ]
    My personal trial and error experience is that your first statement is correct i.e. Zone 2 analog sources only. However there is a work around if you can extract an analog from a digital source and input that to the receiver. Steaming devices and cable boxes for example often have analog outs in addition to HDMIs that will not work with the receiver
    [ Jeffrey  Jun 28, 2016 ]
    I need a receiver that can be installed in a cabinet. This receiver does not appear to have a power plug in for a fan as my current on does. Has anyone had heat issues?
    [ Amyfooz  Jun 26, 2016 ]
    1 answer
    Hi, Amyfooz, I have the TX-NR646 installed in a passively vented cabinet similar to "". It's on its own shelf with about 2" clearance above the unit. It's noticeably warm when running, but not so warm that you can't comfortably leave your hand on top of the hottest part of the unit, so I'm not concerned about overheating. My satellite receiver box (?!) generates about the same amount of heat. I hope that helps with your decision.
    [ GEORGE  Jun 28, 2016 ]
    I have read that the receiver gets very hot when in use, would it be safe to have enclosed in a tv stand?
    [ Nalynn  Jun 24, 2016 ]
    5 answers
    I don't know.Mine is in the open.But it is a very good receiver.Good luck,David
    [ DAVID K  Jun 25, 2016 ]
    It depends on how much space there is around the unit in the stand. I would avoid it if possible, unles u have at least a couple of inches on top, sides and more in back.
    [ RON  Jun 24, 2016 ]
    I have my in a tv cabnit n I don't have a problem with it. As long as u have a way for the heat to get out u should b fine.
    [ LONNIE G  Jun 24, 2016 ]
    I can't say I've had that problem re: the receiver getting hot -- but I don't have it in an enclosed space (i.e., so there's plenty of air around it). Not sure what to tell you re: putting it inside a TV stand. Sorry.
    [ Deborah  Jun 24, 2016 ]
    Heat kills, plus you will generate more heat watching "Independence Day" than you would watching "The Remains of The Day." Put your AVR on the lowest shelf, with at least 4" of clearance above it, and hook up a quiet computer fan to help ventilate the enclosure. Leave any cabinet doors open, and if possible remove the back of your TV stand for more air movement through the cabinet.
    [ Michael  Jun 24, 2016 ]
    I'm looking to connect this to my Amazon Echo Dot. With my current setup I have bluetooth dongle, but the echo is constantly auto connecting and if the receiver is off or on another channel the echo is inaudible. For my use case I would only like the receiver's bluetooth to be on/active when the receiver is on that mode. Can anyone shed some light on how the bluetooth channel works and how devices connect? Even better would be if Amazon allow users to turn off auto-connect, but that does not look promising at the moment.
    [ Jacob  May 04, 2016 ]
    1 answer
    If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center:
    [ Krissy  May 06, 2016 ]  Staff
    will this devise work with my samsung android phone?
    [ perry  May 01, 2016 ]
    2 answers
    yes this device will work with your android phone
    [ Boatyard  May 03, 2016 ]
    It should Perry. I was showing my son how my iPhone connects to it and he was busy connecting his android to it to show me : ) I think it took him a whole minute.
    [ EDWARD M  May 02, 2016 ]
    we have 4k tv, Roku, Bose speakers, outdoor speakers, Blu ray, and blue tooth needs. Can this receiver power all? I was advised the Bose system had its own amplifier and could be played through a receiver...
    [ Kevin  Apr 17, 2016 ]
    1 answer
    Not sure about the 4K tv, but the system will handle blue tooth, blue ray, and nicely controls two sets of speakers. You can control the volume of two zones and even have one zone run the tv or whatever and zone two can run the phono, receiver cd, blue tooth, ( like of your iPhone.) Very versatile.
    [ MARTIN J  Apr 18, 2016 ]
    I've never fully used 2-zone setup. If I have a blu-ray playing over hdmi in one room with 7.1, can my wife listen to a vinyl in another room simultaneously using the stereo zone-2 speakers?
    [ MICHAEL  Apr 11, 2016 ]
    2 answers
    Yes, she should be able to, but I believe your Blu-ray audio output will drop to 5.1
    [ Terrence  Apr 14, 2016 ]
    Yes. You can play different sources in Zones 1 and 2. The only exceptions are Wi-Fi and Bluetooth, which have to play in both zones at the same time.
    [ Kurt  Apr 13, 2016 ]
    Has Onkyo finally added the DTS:X system upgrade to the TX-NR646 receiver that was said would be available by the end of 2015?
    [ stan  Apr 08, 2016 ]
    2 answers
    Yes, the TX-NR646 and TX-NR747 have DTS:X
    [ Douglas  Apr 10, 2016 ]
    Last firmware update for the 646 is dated 9/30/2015!
    [ Michael  Apr 08, 2016 ]
    I have recorded audio wave files at 24 bit 96k on my computer. Does this unit (TX-NR646) provide higher quality sound playback off my network, or will I not notice any higher quality sound from this unit? I have high quality speakers.
    [ Rick  Apr 06, 2016 ]
    1 answer
    No matter what you're listening to, it will sound powerfully full, clean and clear. A premium-quality AK4458 digital-to-analog converter from Asahi Kasei implements unique low-distortion filtering technologies for clear sound, and unlocks the full potential of any audio format, including compressed, lossless, and hi-res audio (MP3, WMA, WMA Lossless, FLAC, WAV, OggVorbis, AAC, Apple Lossless, DSD 5.6 MHz, LPCM, and Dolby TrueHD).Enter an answer to this question.
    [ Luis  Apr 06, 2016 ]
    Does this receiver have internet radio?
    [ DikDak  Apr 05, 2016 ]
    1 answer
    Yes. But I do not know how to use it. I pushed the net button and then options pop up. It connected to wifi easily and Bluetooth works
    [ DaddyE  Apr 05, 2016 ]
    Would you please email me an owners manual for the TX-SR674 ONKYO RECEIVER? I lost all of my paper work due to flooding. Thank you so much. Sincerely, stanley maxie
    [ Stanley  Apr 04, 2016 ]
    1 answer
    If you purchased the product from Crutchfield, feel free to contact our Tech Support team. We will need to connect with your original order. The item is not on our website for downloading the owners manual. If we can locate your order then we may be able to assist. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center:
    [ Kenny  Apr 04, 2016 ]  Staff
    Can this receiver output to both HDMI outputs simultaneously? That is, can I drive two TVs at the same time with the same input material? WIth the second set of L+R right audio, it seems like I should be able to drive a second TV and two more speakers while the 5.1 part of the system is in use with the first TV.
    [ G  Apr 04, 2016 ]
    2 answers
    Yes you can. I am using the 2 HDMI outputs to 2 TVs in separate rooms showing same source content
    [ Michael  Apr 08, 2016 ]
    I have not tried that but it has no problem sending to 2 rooms from the same or two sources. I kmow it won't send all different sources once. There is an advanced manual on line, give that a try.
    [ ROBERT  Apr 04, 2016 ]
    I want to get this receiver but unfortunately can only fit a 3.1 setup in my living room. Would I lose sound FX from the rear and side surround channels when watching a 5.1 or 7.1 movie or is there a way to route the surround FX to the front Left and front Right speakers? Are there any receivers that would let you do this? Sorry, coming from a stereo setup and not sure what these receivers can do! Thanks!
    [ Jason  Mar 30, 2016 ]
    3 answers
    You should have no trouble, Onkyo has a TD setting is for your 3 speaker setup. You can find this info on page 17 in the advanced manual, it's the last description on that page. I think you can download it from the Crutchfield NR646 page. There are other settings that you may like.
    [ John  Mar 31, 2016 ]
    You will lose the sound fx if you only have three speakers. You can only get the effect with 5-7 speakers. You can always get a sound bar instead and they are made to sound like surround sound and most have a sub woofer
    [ MARCOS  Mar 30, 2016 ]
    I'm not sure about the details of a 3.1 vs a 5.1 or 7.1 or how that relates to the number of speakers for surround sound and location. What I can share is that I have 2 floor speakers connected only to the front and the sound is like a movie theater and awesome. I don't have other speakers on the sides of my room or rear but if you have room for that I'm sure it would be even better. Good luck Also I think a Crutchfield takes returns up to 60 days? If you want to replace.
    [ james  Mar 30, 2016 ]
    I won't be needing video surround sound for a while, so in the meantime, can this be used with a 2 standard speaker setup for music only?
    [ K-Man  Mar 29, 2016 ]
    5 answers
    Yes you can. There is a setting to use a 2.1 configuration and you can turn off sub so making it 2.0
    [ Kenneth  Mar 30, 2016 ]
    [ LONNIE G  Mar 29, 2016 ]
    [ DAVID K  Mar 29, 2016 ]
    Yes. Obviously, quality depends on your speakers. I really liked how it sounded. I returned it because it did not have multi channel capability. But the sound was very good. ANd the price is great.
    [ JOHN F  Mar 29, 2016 ]
    [ Thomas  Mar 29, 2016 ]
    Do I need a router for wi fi or is there one built in?
    [ Carlo  Mar 12, 2016 ]
    5 answers
    The receiver has a built in wifi, but you need to have a home network for which you need a router. Hope this helps
    [ JGM  Mar 14, 2016 ]
    You need a seperate router.
    [ Derek  Mar 13, 2016 ]
    There is no built in wi-fi. You have 2 options: 1. Connect wirelessly to your home wi-fi, or 2. Hard wire directly to your home wi-fi router.
    [ CHARLES  Mar 13, 2016 ]
    I am not totally sure what you're asking. You need a router in your house to create the Wi-Fi signal. If you already have Wi-Fi signal, the receiver will pick it up without any additional components. So I already had Wi-Fi in my house and once I had the receiver installed, I could connect right to the Wi-Fi.
    [ COLBY  Mar 12, 2016 ]
    This Onkyo will hook up with your existing router using prompts that you get on screen when you hook up your television with the Onkyo.
    [ MARTIN J  Mar 12, 2016 ]
    Does this TX-NR646 still require firmware update or does it come with the update now since we are past 2015?
    [ mark  Mar 10, 2016 ]
    4 answers
    Last firmware update dated 9/30/2015. You can set the receiver to auto update in settings.
    [ Michael  Apr 08, 2016 ]
    We had to install the firmware update after we purchased the unit. It does not take long so the update should not be an issue. We purchased the unt right after the first of the yaer (2016). It has worked like a charm. Good luck with your purchase.
    [ R  Mar 11, 2016 ]
    There is a firmware update on their site. I'm not familiar enough yet with my recently purchased 646 to fix it back if a problem develops. The precautions were overwhelming for a rookie operator. lol
    [ Michael  Mar 11, 2016 ]
    I'm not sure about a 2016 specific firmware update, nor have I needed to address that issue. However, once connected to the internet it has a pretty robust system menu. There may be an update function in there, but I've never needed to look. I bought mine about 3-4 months ago and everything has been working fine - once I got it set up and connected, it's been trouble free. I've been very happy with the purchase thus far.
    [ Merlin  Mar 11, 2016 ]
    I have a 5.1 set up in my main room but I bi-amp my front speakers. I also have 2 speakers in a second room that I use. I understand that this receiver only has 7 channels, but when I turn on zone 2, am I able to keep my bi-amp front speakers fully powered and lose my back speakers instead?
    [ Matt  Mar 06, 2016 ]
    1 answer
    Hi Matt, The answer is "No, but yes". When set up as a standard 7.1, non-bi-amp system, (like mine) and you turn on Zone 2, the Onkyo will automatically shunt the back surround/bi-amp to the Zone 2 speaker outputs instead. When you shut off Zone 2 it restores the back surround/bi-amp speakers. All this is automatic. However, I did an experiment for you. I went into the menus and set my speaker outputs to "bi-amp". This started blasting the back surround speakers of my 7.1 set up, as if they were front speakers, so the bi-amp was working correctly. Turning on bi-amp shuts down the Zone 2 speakers entirely. You would have to go into the menus again to turn the speaker outputs on. However, it doesn't effect the Zone 2 RCA line outputs, which still were working fine. I have a virtual "Zone 3" slaved to Zone 2 by connecting the Zone 2 line outputs to an old amp with its speaker wires running to my "Zone 3" speakers. If you have an old amp that would be satisfactory for your Zone 2 speakers, you could have bi-amp 5.1 and Zone 2 dependably (and also independently, if that makes sense). The only inconvenience would be that you would have to also turn on the Zone 2 amp. I hope that helps. By the way, I absolutely love the Onkyo 646. I have a very complicated set up, with about twelve different sources, and I can usually get whatever I want going with a few remote control clicks. My biggest problem is remembering all the possibilities. I hope that helps. Scott Badman
    [ Lawrence Scott  Mar 07, 2016 ]
    can I use an IPOD shuffle with the USB?
    [ scott  Feb 21, 2016 ]
    1 answer
    I think you can. I mainly use an IPad via wifi now but I in the past I have used an old Ipod and cable and it worked. Good luck
    [ Carlos  Feb 23, 2016 ]
    I had a Onkyo 5 series for over 10 years and loved it. Eventually, the sub woofer output failed and then about a year later the entire thing failed and stopped producing any sounds regardless of the source. I was seriously considering upgrading to the new 646 but have heard MANY reports of the units basically ceasing to work after as little as an hour of operation and a nightmare getting answers or solutions from Onkyo support. Should I be wary of purchasing the 646? Have they started using cheaper / lower quality electronic components?
    [ Chris  Jan 22, 2016 ]
    2 answers
    All I can say is that I haven't had any troubles. In deciding what receiver to buy, I did notice a (seeming) underlying thread: it's easy to short out the speakers, particularly if you're using banana clips to plug in. That may be part of what's going on. If so, I wouldn't call that cheap components, but maybe not 'optimal' design? My experience has been basically flawless. Much more so than with the Samsung SUHD TV I have my Onkyo hooked to.
    [ Craig  Jan 25, 2016 ]
    I can;t speak to what components are being used, but I have had the receiver for 6 months and have had no problems with it. Works beautifully.
    [ Thomas  Jan 23, 2016 ]
    Will this play HDMI source audio in Main Room and 2nd Zone at same time? i know it can play pandora in both zones at same time. Wasn't sure of HDMI source.
    [ Joseph  Dec 12, 2015 ]
    3 answers
    Yes it can. While you are using the main room and zone 2 at the same time, the main room will only give you 5.1 surround, and your zone 2 can play in 2 channels. But yes, it will play hdmi in both.
    [ Erick  Dec 18, 2015 ]
    Sorry I don't know. Good luck.
    [ DAVID K  Dec 13, 2015 ]
    Unfortunately no Joseph. For me this meant my Roku 3 could only be played in my main room, as the only output option from the Roku 3 is HDMI.
    [ EDWARD M  Dec 12, 2015 ]
    Does this unit allow me to have a second video source from the zone 2 option or is that for audio only because in the picture I noticed 2 HDMI outputs. How does that work thank you. Also if it does not can you provide me with models that can have a second zone that provides audio and video from the receiver?
    [ Julio  Oct 23, 2015 ]
    4 answers
    I'm sorry but I haven't used the unit for more than one sound and picture device. It sounds like that is important for you purchase choice but other than that it is the best received I've owned for what I use it for. In my manual I couldn't find anything about that but there is a website for an advanced manual at they not allowing links to other sits so maybe u can figure this out. "." Will be dash-- "/" will be "!" onkyo-com!manual!txnr646!adv!en-html of course there's a www in front
    [ michael  Oct 26, 2015 ]
    Hello: I don't think so, Basic Manual, page en-18, indicates that audio can be played in zone 2, i.e. no mention of separate video. Also on that page it says "To listen to a player in Zone 2, you must connect using an RCA cable, a digital optical cable (OPTICAL), or a digital coaxial cable (COAXIAL)" to the receiver, (this indicates that only. one switching path for the HDMI inputs to HDMI outputs exist. The Advanced Manual, page En-30, says the HDMI outputs can be assigned to Main, Sub, or Main+Sub). As for the second question, when I was researching receivers, I didn't run into a receiver that could process 2 HDMI signals at the same time.
    [ Anson  Oct 25, 2015 ]
    Yes, it does video in a second room. The second zone is able to do video and sound through HDMI. Remember though, yo can only use yor main room in 5.1 ch when zone 2 is active. But this is common in all receivers from this price range to $1200, so its worth it. The receiver is very good, the sound is incredible. I have a $1200 receiver from 6 years ago, and this 646 sounds a bit clearer and louder. You will have to tweak after doing the accu eq set up. Brings the subwoofer level too high, you'll have to play with it to get the right sound. But that is part of the fun.
    [ Erick  Oct 24, 2015 ]
    I think u should contact Onkyo TS. they will b able to help u.
    [ LONNIE G  Oct 24, 2015 ]

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