Onkyo TX-NR646 7.2-Channel Receiver (Certified Refurbished)

Product Specifications


Factory Refurbished


1 Year Warranty

Accessories in the Box   Remote


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Onkyo TX-NR646 7.2-Channel Receiver

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Hear your movies, music, and games come to life with the Onkyo TX-NR646 network AV receiver. This receiver works with DTS:X and supports Dolby Atmos to deliver lifelike sound for a fully immersive listening experience. It also features integrated Bluetooth and WiFi so you can wirelessly stream content from a variety of built-in applications. Features include:

  • Built-in Bluetooth, Wi-Fi and Airplay with Pandora and Spotify to stream virtually any audio from your smartphone, tablet, or PC for clear and powerful sound
  • Dolby Atmos® Support
  • DTS:X Ready
  • HDMI® 8 In / 2 Out Including 1 Front & HDMI & HDCP 2.2 for 4K UltraHD
  • 170 Watts per Channel
  • High-Grade DAC
  • Classic Analog & Hi-Resolution Digital
  • Easy Zone 2 Audio


    Built-in Bluetooth & Wi-Fi® with Pandora, Spotify, and AirPlay

    The TX-NR646 has AirPlay, Wi-Fi and Bluetooth technologies built in. The free Onkyo Remote app puts a range of streaming options at your fingertips, from universal hi-resolution audio via network-attached devices to internet streaming services to music on your smartphone and tablet. Or pair up and enjoy whatever's playing on your Bluetooth-compatible device for huge cinematic sound.

    This receiver comes loaded with Spotify, Pandora, SiriusXM Internet Radio, Slacker and TuneIn. You can select a station and search for music available on these services via the Onkyo Remote app on your phone. You'll never be short of your favorite music to enjoy.



    Dolby Atmos® Support

    With Dolby Atmos, sound comes alive from all directions, including overhead. The format combines a channel-based audio bed with object-oriented sound to place and move specific effects around the room, creating a breathtakingly realistic and captivating sonic atmosphere.

    Sound designers and artists are free to mix in a 3D space, steering effects through surround channels and adding a seamless overhead dimension with discrete height channels.

    Additionally, a new Dolby surround up-mixer allows for your current channel-based content (that has not been mixed for Dolby Atmos) to be expanded to fill the flexible speaker layouts of a Dolby Atmos system.



     DTS:X Ready

    DTS:X is a next-generation object-based surround sound technology that includes height to deliver a fully-immersive listening experience. DTS:X provides listeners the ultimate in flexibility, immersion, and interactivity. Unlike channel-based audio, you will be able to personalize your audio experience. For example, you can turn up just the dialog within a mix. DTS:X allows you to customize to your room layout as well as control dialog and dynamic range.



     HDMI & HDCP 2.2 for 4K UltraHD

    The latest HDMI specs and HDCP 2.2 compatibility support the formats and technologies planned for Hollywood content. The newest HDMI offers a significant increase in bandwidth (up to 18Gbps) to support new features such as 4K@50/60 (2160p), which is 4 times the clarity of 1080p/60 video resolution.

    This Onkyo AVR has the latest HDMI version, which enables transmission of HDR formats, and provides enhanced picture quality by simultaneously enabling greater detail for both the dark and bright parts of an image.



    170 Watts per Channel

    From the quietest dialog passages to booming action scenes, Onkyo's exclusive amplification technology dramatically enhances the audio dynamics of your movies, music and games.

    This Wide Range Amplifier Technology (WRAT) is at the core of Onkyo's signature sound. The innovative amplifier design is comprised of three key elements:

    (1) A low negative feedback design for punchy, true-to-life sound, and cleaner audio across the frequency ranges

    (2) Closed groundloop circuits to reduce individual circuit noise and keep the ground potential free of distortion

    (3) A high instantaneous current to handle big dynamic gains

    This allows massive power at 170 W/Ch (6 Ohms, 1 kHz, 0.9% THD, 1 Channel Driven, FTC) and 100 W/Ch (8 Ohms, 20 Hz–20 kHz, 0.08% THD, 2 Channels Driven, FTC).


    High-Grade DAC

    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-resolution audio (MP3, WMA, WMA Lossless, FLAC, WAV, OggVorbis, AAC, Apple Lossless, DSD 5.6 MHz, LPCM, and Dolby TrueHD).


    Condition Factory Refurbished
    Warranty 1 Year Warranty
    Power, 1ch, 6ohm, 1kHz
    Power, 2ch, 8ohm, 20Hz-20kHz
    Atmos Capable
    HDMI In/Out
    HDMI Version
    MHL HDMI Input
    Digital In (Opt/Coax)
    Phono In
    Analog Preouts
    Powered Zone 2/3
    Zone 2/3

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