Onkyo TX-NR646 AV Receiver

Onkyo TX-NR646 AV Receiver

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Onkyo build and develop some of the most highly regarded AV receivers on the market today, being one of the few brands who focus on sound quality and functionality without compromising on either aspect. The company's range of home-cinema hubs are built into a variety of price points, meaning there's a unit for everyone, and each of these units in each of these price categories tend to win awards and hearts alike.

The TX-NR646 from Onkyo provides the user with a truly cutting-edge experience, featuring a vast number of brilliant audio/visual technologies, as well as a convenient number of prolific features and functions. It's a 7.2 channel AV receiver, and is the first in its class to feature the revolutionary DTS:X and Dolby Atmos multi-dimensional audio formats. 

Onkyo's specialist high-current amplification system means that the NR646 is capable of driving a dedicated set of loudspeakers with maximum impact and fidelity at 160 watts per channel. The unit is also capable of making the most of UltraHD (4K) video content with eight HDMI® 2.0a terminals including dedicated HDCP 2.2 compatible inputs for premium 4K video content and two HDMI outputs for video in separate rooms. Audio is further improved with the integration of the TXNR646's high-quality 384 kHz/32bit AKM DAC, meaning that not only are your favourite films, shows and games brought to life - but your high resolution music is as equally immersive, whether from a hard-wired source or streamed directly to the unit. 

In terms of streaming, the NR646 is able to receive files from built-in WiFi, Bluetooth, AirPlay or internet-based music services like Spotify Connect and Deezer. Onkyo have developed a free-to-download Remote App, which gives your receiver access to audio stored on your mobile device or online services that can then be streamed to the unit. The Remote App also offers playback control in two zones.

Vinyl fans are also catered for, as the TX-NR646 has a built-in phono equalizer input, allowing direct connection to a turntable without the need for an external phono stage. 



 Amplifier Section  
Power Putput
All Channels
 160 W/Ch
(6 Ω, 1 kHz, 1% THD, 1 Channel Driven, IEC) 1
75 W/Ch
(6 Ω, 1 kHz, 1 Channel Driven, JEITA
 Dynamic Power 240 W (3 Ω, Front)
210 W (4 Ω, Front)
120 W (8 Ω, Front) 
THD+N (Total Harmonic Distortion + Noise)  0.08% (20 Hz–20 kHz, Half Power)  
 Damping Factor 60 (Front, 1 kHz, 8 Ω)  
Input Sensitivity and Impedance   200 mV/47 kΩ (Line)
3.5 mV/47 kΩ (Phono MM) 
Rated RCA Output Level and Impedance  100 mV/2.2 kΩ (Zone 2 Line Out)
200 mV/470 Ω (Subwoofer Pre Out)  
 Maximum RCA Output Level and Impedance 1.0V/2.2 kΩ (Zone 2 Line Out)
200m V/470 Ω (Subwoofer Pre Out)  
Phono Overload  70 mV (MM, 1 kHz, 0.5%)  
 Frequency Response 10 Hz–100 kHz/+1 dB,
-3 dB (Direct Mode) 
Tone Control
±10 dB, 20 Hz (Bass)
±10 dB, 20 kHz (Treble) 
Signal-to-Noise Ratio 100 dB (Line, IHF-A)
80 dB (Phono MM, IHF-A)
Speaker Impedance 4 or 6 Ω–16 Ω
Video Section  
Input Sensitivity/Output Level and Impedance 1.0 Vp–p/75 Ω (Component Y)
0.7 Vp–p/75 Ω (Component PB/CB, PR/CR)
1.0 Vp–p/75 Ω (Composite)
Component Video Frequency Response 5 Hz–13.5 MHz/+0 dB, -3 dB
Tuner Section  
Tuning Frequency Range FM: 87.5 MHz–108 MHz
AM: 522 kHz–1,611 kHz / 530 kHz–1,710 kHz 
FM/AM Preset Memory 40 Stations
Power Supply AC 220–240V~, 50/60 Hz
Power Consumption 630 W
No-Sound Power Consumption 70 W
Standby Power Consumption 0.15 W
Dimensions (W x H x D) 435 x 173.5 x 329 mm
Weight 9.4kg

Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25

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