Amplifiers & Receivers Hi-Fi/Home Theater Reviews

Onkyo TX-NR646 Review | SoundVisionReview

Onkyo TX-NR646 Front

Onkyo has all the time been on the forefront in relation to adopting and implementing new know-how and options of their newest merchandise. They have been one of many first so as to add HDCP 2.2 and Dolby Atmos, and as soon as once more they paved the way by including the newest Immersive Encompass Sound codecs to the brand new TX-NR646 7.2-Ch Community A/V Receiver – on this case DTS:X. All that’s lacking on this very reasonably priced mannequin is the Auro-3D format.

Onkyo TX-NR646

  • Sound High quality – 80%

  • Options – 90%

  • Ease of Use – 90%

  • Construct High quality – 80%



The Onkyo TX-NR646 is highly effective, balanced and dynamic, and it’s been nothing lower than a pleasure to make use of and take heed to.

Three HDCP 2.2 HDMI.
Highly effective, balanced sound.

No video up-scaling.
AccuEQ might do with some enchancment.

Options and Design

Visually, the TX-NR646 seems to be kind of the identical as its predecessor, the TX-NR636, with solely a big spherical quantity management to interrupt up the in any other case angular look. A better inspection does nevertheless reveal a lot of noticeable modifications, each on the inside and outside; eight HDMI inputs (three HDCP 2.2 suitable), antennas for improved Wi-Fi/Bluetooth efficiency, Asahi Kasei’s AKM4458 384Okay/32 Bit DAC, and added AirPlay. The MHL interface on the entrance HDMI enter is eliminated and the USB port has been moved to the again.

​Briefly, no main modifications in comparison with the earlier mannequin, aside from some added connectivity and improved digital-to-analog conversion. Oh, and DTS:X in fact.

The AccuEQ room acoustic calibration has been improved in addition to it now implements equalization on the entrance audio system, one thing we missed within the earlier mannequin. The measurements are nonetheless being made utilizing just one place, however it’s not a serious challenge at this comparatively modest worth, particularly because the AccuEQ lives as much as its identify and truly embrace an EQ for the totally different speaker teams – together with the subwoofer(!). It is a helpful, though restricted, 5-band EQ that may be adjusted in steps between -6dB and +6dB. The speaker terminals supply some flexibility and permits you to select between conventional setups ( as much as 7.2), extra immersive setups together with Peak Audio system, and Zone 2 and bi-amping.

Onkyo TX-NR646 remote control

The brand new options are additionally represented within the on-screen menus, which nonetheless appears sometimes Onkyo, which means pretty properly structured, straightforward to navigate and intuitive, but in addition a bit uninteresting to take a look at. The distant management is just about the identical as beforehand however with some minor modifications. It nonetheless will get the job achieved and has clearly laid out buttons, however Onkyo additionally gives a Distant App (iOS, Android) that mixes management and streaming performance in a single easy-to-navigate interface.

​Video and Multimedia Performance

The TX-NR646 helps 4K decision as much as 60Hz because of the HDCP 2.2 HDMI inputs. It additionally helps 3D, Audio Return Channel, Deep Shade, x.v.Colour™, LipSync, CEC, Prolonged Colorimetry (sYCC601, Adobe RGB, Adobe YCC601), Content material Sort, 3D Twin View and 21:9 Facet Ratio Video Format. It does nevertheless not up-scale decrease resolutions to UHD, so you’ll have to depart the up-scaling to your TV.

Audio-wise it helps ​Dolby Atmos, Dolby TrueHD, Dolby Digital Plus, Dolby Digital, DTS:X, DTS-HD Grasp Audio, DTS-HD Excessive Decision Audio, DTS 96/24, DTSES, DTS, DTS Categorical, DSD and Multichannel PCM (as much as 8ch).

It’s also possible to stream audio wirelessly by way of bluetooth or Wi-Fi, and it helps Spotify, Pandora, SiriusXM Web Radio, Slacker and TuneIn. The USB port lets you play media in FAT16 or FAT32 file system format.

Onkyo TX-NR646 inputs

​Sound High quality & Listening Expertise

​We began the listening check by establishing the system utilizing the AccuEQ acoustic calibration, and though the system does an honest job we nonetheless ended up performing some minor changes earlier than we have been utterly glad with the end result, and we used quite a lot of acquainted music and film scenes to get the TX-NR646 to sound as impartial as potential. We additionally performed round with the varied listening modes, however because the outcome ranged from mildly annoying to exceedingly bemused we finally determined to show any pointless processing off. Whether or not you need to use the listening modes or apply the EQ or not is a matter of style and the situation of your listening room, however it’s good to know that you are able to do any mandatory changes if wanted.

We additionally did a fast measurement of the output levels and the TX-NR646 confirmed us some strong numbers – staying above 75 watts per channel with all channels pushed onerous. Films not often drive all channels at full pressure, however it’s good to know that this specific Onkyo have respectable energy reservs and may deal with some stress.

Recently, ‘Mad Max: Fury Street‘ have shortly turn into one among our favourite films to make use of as reference once we check new gear, particularly amps and audio system, as it’s full of high-octane motion and superior sound results from begin to end, giving the audio gear a rigorous exercise, and in addition supplies a Dolby Atmos monitor. This film cowl all frequencies and the LFE monitor is an effective method to separate the wheat (the great) from the chaff (the dangerous) relating to bass efficiency – for those who’re listening to good audio system and amps you ought to be getting a fairly bodily expertise. In our case we principally used a Klipsch Reference Premiere 5.1.2 setup, which can look like a little bit of an overkill contemplating the modest worth of the TX-NR646, nevertheless it gave us a reasonably good indication of how the Onkyo performs.

And it does certainly carry out. Mad Max: Fury Street could be fairly messy at occasions with a whole lot of issues happening, however the TX-NR646 all the time managed to maintain issues beneath management. Dialog was simply distinguishable and stored from being muddied up by all of the background noise, and the soundstage was each broad and deep with straightforward to pinpoint soundeffects. Sound results like bullets whizzing over our heads, thunder, wind and sandstorms was introduced with authenticity and realism, virtually making us consider that we must sweep the sand off our listening room flooring as soon as we have completed watching the film.

Any film with an honest sound combine virtually made us overlook to pay attention critically, as we discovered ourselves immersed in no matter was occurring on the display, and we will’t consider a greater testomony to the TX-NR646’s talents and efficiency. The highly effective, properly balanced, detailed and dynamic sound additionally makes music really pleasant. It might not attain the heights of some devoted two-channel amps for a similar worth (or extra), or its personal greater brothers (TX-RZ800 & 900), particularly on the subject of the best grains of decision and supreme energy, however there’s no denying that the TX-NR646 is among the prime contenders within the sub $700 class.


The Onkyo TX-NR646 is highly effective, balanced and dynamic, and it has been nothing lower than a pleasure to make use of and take heed to. The one factor that we will actually complain about is that the AccuEQ might use some enhancements. The truth that it additionally provides HDCP 2.2 and DTS:X signifies that it has only a few rivals on this worth class.



  • Present Worth:
  • Ends:
    Nov 25, 2018 zero:00:22 CET

Onkyo Calibration Mic// TX-NR545,TXNR636,TXNR737,TX-NR535, Tx-nr838, Tx-nr646

  • Present Worth:
  • Ends:
    Dec 24, 2018 5:05:23 CET

Onkyo TX-NR646 7.2 Channel Network A/V Receiver - AS IS - B

  • Present Worth:
  • Ends:
    Dec 2, 2018 15:54:40 CET

● Outfitted with 7 ch amplifier
● Helps playback in Dolby Atmos format which offers 360-degree placement and motion of sounds together with overhead sound
● Helps playback in DTS:X, which is DTS’s nextgeneration object-based encompass sound know-how that features peak to ship a fully-immersive listening expertise to your front room
● Dolby Encompass listening mode expands 2 ch, 5.1 ch or 7.1 ch supply to out there speaker configurations
● Outfitted with 4K suitable HDMI IN/OUT jacks
● Outfitted with 2 HDMI output jacks
● Helps the HDMI Standby By means of perform which permits sign transmission from gamers to the TV in standby state
● Helps HDCP2.2, a strict copy-protection for offering top quality content material (HDMI IN1 to IN3/HDMI OUT MAIN/ SUB)
● Helps ARC (Audio Return Channel)
● Helps USB storage playback
● Helps number of community features similar to Web Radio, DLNA, AirPlay and so forth.
● Helps Wi-Fi and Bluetooth®
● Outfitted with a PHONO jack enabling reference to a turntable
● Bi-Amping functionality
● A/V Sync Perform to right deviation of audio and video
● Multi-zone perform which lets you play a unique supply in one other room from the primary room
● 32 bit DSP (Digital Sign Processor) with wonderful calculation efficiency
● Music Optimizer™ for compressed digital music information
● Part Matching Bass System
● Automated speaker setup out there utilizing provided calibrated microphone (AccuEQ Room Calibration)
● Helps playback of MP3, WMA, WMA Lossless, FLAC, WAV, Ogg Vorbis, Apple Lossless, DSD, Dolby TrueHD by way of community and USB storage gadget (the supported codecs will differ relying on the use setting)

Amplifier Part
Energy Output
All Channels 170 W/Ch (6 Ohms, 1 kHz, zero.9% THD, 1 Channel Pushed, FTC);
100 W/Ch (eight Ohms, 20 Hz–20 kHz, zero.08% THD, 2 Channels Pushed, FTC)
Dynamic Energy 240 W (Three Ohms, Entrance)
210 W (four Ohms, Entrance)
120 W (eight Ohms, Entrance)
THD+N (Complete Harmonic Distortion + Noise) zero.08% (20 Hz-20 kHz, Half energy)
Damping Issue 60 (Entrance, 1 kHz, eight Ohms)
Enter Sensitivity and Impedance 200 mV/47 k-ohms (Line)
Three.5 mV/47 k-ohms (Phono MM)
Rated RCA Output Degree and Impedance 100 mV/2.2 k-ohms (Zone 2 Line Out)
200 mV/470 Ohms (Subwoofer Pre Out)
Most RCA Output Degree and Impedance V/2.2 k-ohms (Zone 2 Line Out) V/470 Ohms (Subwoofer Pre Out)
Phono Overload 70 mV (MM, 1 kHz, zero.5%)
Frequency Response 10 Hz-100 kHz/+1 dB, -Three dB (Direct Mode)
Tone Management ±10 dB, 20 Hz (Bass)
±10 dB, 20 kHz (Treble)
Sign-to-Noise Ratio 100 dB (Line, IHF-A)
80 dB (Phono MM, IHF-A)
Speaker Impedance 6 Ohms–16 Ohms
Video Part
Enter Sensitivity/Output Degree and Impedance
Video Vp-p/75 Ohms (Element)
zero.7 Vp-p/75 Ohms (Element PB/CB, PR/CR) Vp-p/75 Ohms (Composite)
Element Video Frequency Response 5 Hz–13.5 MHz/+zero dB, -3dB
Tuner Part
Tuning Frequency Vary
FM 87.5 MHz–107.9 MHz
AM 530 kHz–1,710 kHz
FM/AM Preset Reminiscence 40 stations
Energy Provide AC 120 V~, 60 Hz
Energy Consumption 6.four A
No-Sound Energy Consumption 70 W
Standby Energy Consumption zero.1 W
Dimensions (W x H x D) 17 1/eight” x 6 13/16″ x 12 15/16″ (435 x 173.5 x 329 mm)
Weight 20.7 lbs (9.four kg)

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