Onkyo TX-NR818 vs Onkyo TX-RZ840

Here we are comparing Onkyo TX-NR818 to Onkyo TX-RZ840 to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. The Onkyo TX-NR818 has 7 channel and the Onkyo TX-RZ840 has 9 channel amplifiers.

Onkyo TX-NR818	Onkyo TX-RZ840
Onkyo TX-NR818 was introduced in 2012. It is equipped with 7 channel amplifier with 135 W (8 Ω, 20 Hz - 20 kHz and 2 channel driven) power per channel and is capable of 9.1 maximum channel processing. It , passes 1080/60p and upscales up to 4K/30p (Marvell Qdeo) video signal.	Onkyo TX-RZ840 was introduced in 2019. It is equipped with 9 channel amplifier with 120 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) power per channel and is capable of 11.2 maximum channel processing. It supports Dolby Atmos and DTS:X, passes 4K/60Hz and upscales 1080p to 4K video signal.

We evaluated Onkyo TX-NR818 and Onkyo TX-RZ840 and gave them scores of 80 and 91 out of 100 recpectively. Our ranking system is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

For more details about the ranking please go to    Evaluations section.

This section shows those features and specifications which are the reason to choose Onkyo TX-NR818 over Onkyo TX-RZ840.

	Onkyo TX-NR818	vs	Onkyo TX-RZ840
Higher Power Output	135 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	vs	120 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
Front Wide Channel Support		vs
THX™ Certification	Select™2 Plus	vs	Select™ (previously known as Select2)
Independent Block Construction (Amp/Preprocessor)		vs
Dolby Pro Logic	PLIIz	vs
Dolby Digital EX		vs
DTS Neo	Neo:X	vs
Music Playback via USB	FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, Dolby TruHD, LPCM, AAC	vs	FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
High Resolution Audio Formats via USB	FLAC, WAV, Apple Lossless, DSD, WMA Lossless, LPCM, AAC, Dolby TrueHD	vs	FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD
Dialogue Lift	Screen Centered Dialog	vs
Audyssey Dynamic EQ		vs
Audyssey Dynamic Volume		vs
Audyssey DSX		vs
Component Video Maximum Resolution	1080p	vs	480i/576i
isf Certified Calibration Control		vs
MHL Input	Front HDMI	vs
InstaPrevue Input Source Prevue		vs
More HDMI Inputs	8 (1 front)	vs	7 (1 front)
USB Input	1 Front (for iPod/iPhone) and 1 Rear	vs	1 (Rear)
More Optical Inputs	3 (1 front)	vs	1
More Coaxial Inputs/Outputs	3	vs	1
More RCA Line Inputs	7 (1 front)	vs	6
More Composite Video Inputs	5 (1 front)	vs	2
More Composite Video Outputs	1	vs
More Component Video Inputs	2	vs	1
More Component Video Outputs	1	vs
PC In		vs
Front A/V Inputs	HDMI/MHL, USB, Composite Video, RCA Audio, Optical	vs	HDMI
+12V Trigger Output	2 (Zone2, Zone 3)	vs	1 (MAIN, 100 mA)
Remote (IR) Input/Output	1 / 1	vs	1 / 0
ONKYO-RI System Control		vs
Pandora		vs
More Speaker Terminals	11	vs	9
More Large Speaker Terminals	11	vs	9
Color-Coded Speaker Terminals		vs
Higher Dynamic Power per Channel, 3 Ω, Front)	300 W	vs	250 W
Higher Dynamic Power per Channel, 4 Ω, Front)	250 W	vs	220 W
Higher Dynamic Power per Channel, 8 Ω, Front)	150 W	vs	130 W
Higher S/N Ratio (Line, IHF-A)	110 dB	vs	106 dB

This section shows those features and specifications which are the reason to choose Onkyo TX-RZ840 over Onkyo TX-NR818.

	Onkyo TX-NR818	vs	Onkyo TX-RZ840
More Channels	7.2	vs	9.2
VLSC (Vector Linear Shaping Circuitry)		vs	Front L/R Channels
Higher DAC Specs	192 kHz/24 Bit	vs	384 kHz/32 Bit
More Channel Processing	9.1	vs	11.2
Dolby Atmos		vs
Dolby Atmos Height Virtualization		vs
Dolby Surround Upmixer		vs
DTS:X		vs
DTS Neural:X		vs
IMAX Enhanced		vs
Gapless Playback		vs
DTS Dialog Control		vs
More Tone Control Channels	Front L/R Channels	vs	All Channels
Independent Subwoofer Outputs		vs
HDR10		vs
BT.2020 color space		vs
Dolby Vision		vs
HLG		vs
Newer HDCP Version	2.2	vs	2.3
Video Signal Passthrough	up to 1080p	vs	up to 4K/60p (RGB/YCbCr4:4:4)
Wi-Fi	via Front USB (optional UWF-1 sold separately)	vs
Bluetooth		vs	SBC, AAC
Chromecast Built-In		vs
Works with SONOS		vs
DTS Play-Fi		vs	via Onkyo Music Control app
AirPlay		vs	AirPlay 2 after firmware update
More HDMI Outputs	2 (simultaneous)	vs	2 (1 Main, 1 Sub/Zone2)
More RCA Pre-Outs	9.2	vs	11.2 (barter to Zone 3 Pre/Line Out)
Zone 2 Outs	RCA Line Out	vs	HDMI, RCA Pre/Line Out (shared with Zone B Line out)
Zone 3 Outs	RCA Line Out	vs	RCA Pre/Line Out
Smart Grid-Ready		vs
Tidal		vs
Deezer		vs
Bigger Power Supply	720 W	vs	870 W
Higher Rated Preout Level	200 mV/470 Ω	vs	1 V/470 Ω
Higher DSD Sampling Rate via USB	2.8 MHz	vs	2.8 MHz, 5.6 MHz, 11.2 MHz
Longer Warranty	2 Years	vs	3 Years

We already listed pros and cons of each model. However, you may also find useful to look at their common strengths and weaknesses shown side-by-side.

STRENGTHS	Onkyo TX-NR818	Onkyo TX-RZ840
High Power Output	135 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	120 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
THX™ Certification	Select™2 Plus	Select™ (previously known as Select2)
Channel Processing	9.1	11.2
DSD via HDMI	2-ch/Multi-ch Input	2-ch/Multi-ch Input
Auto Speaker Calibration System with Mic.	Audyssey MultEQ XT32	AccuEQ Advance with AccuReflex™
New HDCP Version	2.2	2.3
Analog To HDMI Upconversion	Component, Composite, PC	Component**, Composite
Many HDMI Inputs	8 (1 front)	7 (1 front)
USB Input	1 Front (for iPod/iPhone) and 1 Rear	1 (Rear)
Many RCA Line Inputs	7 (1 front)	6
Phono Input
RCA Pre-Outs	9.2	11.2 (barter to Zone 3 Pre/Line Out)
Composite Video Inputs	5 (1 front)	2
Component Video Inputs	2	1
Ethernet
Zones	3	3
Analog Tuner	FM/AM with RDS	FM/AM with RDS
Spotify

WEAKNESSES	Onkyo TX-NR818	Onkyo TX-RZ840
No Auro 3D with Auro-Matic Upmixer
No HDR10+
No eARC
No 8K Passthrough	up to 1080p	up to 4K/60p (RGB/YCbCr4:4:4)
Does not Work with Amazon Alexa
Few 8K Inputs
No Digital Radio

Onkyo TX-NR818	Onkyo TX-RZ840
7 channel Amplifier: Onkyo TX-NR818 features 7 channel power amplifier. It is rated at 135 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.	9 channel Amplifier: Onkyo TX-RZ840 features 9 channel power amplifier. It is rated at 120 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

• Dynamic Audio Amplification: Onkyo TX-RZ840 features Dynamic Audio Amplification which is Onkyo’s amplification philosophy that focuses on capturing the energy and dynamism contained in the audio signal and reproducing it without loss. Audio signals are not static like a test tone, but rather a countless collection of constantly moving waves. While static measurements such as S/N ratio and Total Harmonic Distortion are important, Onkyo believes that excellent dynamic and transient response is the key to emotionally involving sound. Dynamism - the “life” in music - is achieved when the amp can respond to changes in the signal instantaneously, so notes start and stop naturally and the nuances in attack, decay, sustain, and release are voiced with conviction. Onkyo home theater receivers represent the culmination of almost 70 years’ experience in amplifier design. The unique elements of their amplification system comprise high-current, low-impedance architecture to accurately control large speaker cones while enabling instantaneous response to dynamic changes, and discrete wide-range amplifier circuit topology to eliminate phase shift for clear and accurate audio imaging.
• WRAT (Wide Range Amp Technology): Onkyo TX-NR818 features Onkyo’s Wide Range Amp Technology (WRAT) circuit layout that prevents phase shifting by pushing the roll-off point higher than the listening-level frequency. Amplifying sound without phase shift creates an uncommonly well-focused and realistic audio image. If phase shift occurs and signal timing is not accurate, then neither is the resulting audio image.
• 3-Stage Inverted Darlington Circuitry: Onkyo TX-NR818 features 3-Stage Inverted Darlington Circuitry. Standard amplifiers employ a negative feedback (NFB) design that counters distortion by feeding back the opposite phase of the output signal into the input stage. Unfortunately, NFB is easily affected by inverse electromotive forces from the speakers, leading to an increase in circuit noise. Three-Stage Inverted Darlington Circuitry is a core Onkyo technology incorporating a low-NFB design that makes the sound more natural. Sensitive to oscillations, this circuitry requires very advanced control technology in order to be incorporated into the amplifier.

THX™ certification

Onkyo TX-NR818 is THX™ Select™2 Plus certified. This means that it is ideally suited for a room where the screen-to-seat viewing distance is approximately 3 to 4 meters, and the room size is approximately 56 cubic meters.

Onkyo TX-RZ840 is THX™ Select™ (previously known as Select2) certified. This means that it is for medium sized rooms, up to 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen.

AMPLIFIER	Onkyo TX-NR818	Onkyo TX-RZ840
Channels	7.2	9.2
Power Output	135 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	120 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
Front Wide Channel Support
VLSC (Vector Linear Shaping Circuitry)		Front L/R Channels
THX™ Certification	Select™2 Plus	Select™ (previously known as Select2)
Continuous 6 Ω Rated
Certified 4 Ω Performance
Discrete Output Stage Circuitry
Independent Block Construction (Amp/Preprocessor)
Bi-amp Capability
BTL (Bridged Transless or Bridging)

Onkyo TX-NR818's and Onkyo TX-RZ840's amplifiers can be assigned for different speaker configurations.

• Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
Onkyo TX-NR818: Not supported.
Onkyo TX-RZ840: 5.2.2, 5.2.4, 7.2.2 with internal amplifier and 7.2.4 with addition of external 2 channel amplifier.
• DTS:X Configurations: The following speaker configurations are supported for DTS:X:
Onkyo TX-NR818: Not supported.
Onkyo TX-RZ840: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2, 5.2.4, 7.2.2 with internal amplifier and 7.2.4 with addition of external 2 channel amplifier.
• Configurations without height channels: There are also other speaker configurations available which do not include height channels:
Onkyo TX-NR818: 5.2, 7.2 with internal amplifier and 9.2 with addition of external 2 channel amplifier.
Onkyo TX-RZ840: 5.2, 7.2 with internal amplifier.
• Front Wide Channel support: With the presence of two front wide speakers you can enhance the front surround stage. The following speaker configurations are available for front wide channels:
Onkyo TX-NR818: 9.2.
Onkyo TX-RZ840: Does not support.
• 2-ch Bi-Amp: Both models are able to bi-amp up to 2 main channels simultaneously. During bi-amplification two amplifiers are used for one speaker. One amplifier powers the midrange and tweeter section of the speaker and another amplifier powers the low frequency woofers. Each amplifier is less loaded and performs better. In order to use this feature speakers must have 2 pairs of connectors.

Dolby Atmos

Onkyo TX-RZ840 supports Dolby Atmos.

• Dolby Surround Upmixer: Onkyo TX-RZ840 supports Dolby Surround Upmixer. If the content is not mixed in Dolby Atmos then the Dolby surround upmixer will expand the audio to all channels including ceiling speakers. The upmixer has replaced the Dolby Pro Logic II family with improved upmixing algorithms.
• Dolby Atmos Height Virtualization: Onkyo TX-RZ840 supports Dolby Atmos Height Virtualization which is a digital signal processing solution that leverages Dolby's deep understanding of human audio perception to create the sensation of overhead sound from the listener-level speakers.

DTS:X

Onkyo TX-RZ840 supports DTS:X.

• DTS Neural:X: Onkyo TX-RZ840 features DTS Neural:X which is an advanced upmixer that can take non DTS:X content and upmix it to the DTS:X speaker layout. It has replaced the DTS Neo family with improved flexibility.
• DTS Dialog Control: Onkyo TX-RZ840 has DTS Dialog Control. This function adjusts the dialog levels during playback of the DTS:X stream. It allows you to separately increase the dialog levels in contrast with the background sound and hear dialog easily even under noisy circumstances.

Audyssey DSX

Onkyo TX-NR818 supports Audyssey DSX which allows you to augment a standard five-channel home theater with either two Front Wide or two Front High speakers. The Wide channels create an expansive soundstage and bring out convincing directional effects. Alternatively, Height channels can add a vertical dimension to movie and game soundtracks.

IMAX Enhanced

Onkyo TX-RZ840 is IMAX Enhanced certified. To qualify for IMAX Enhanced certification, 4K HDR televisions, projectors, sound bars, a/v receivers, loudspeakers, powered subwoofers and other premium home entertainment devices must meet carefully prescribed performance requirements established by IMAX, DTS and Hollywood's leading experts.

• What makes an IMAX Enhanced A/V receiver different from an A/V receiver with DTS:X technology? DTS:X technology is commonly found in most multi-channel A/V receivers on the market today. All IMAX Enhanced A/V receivers include DTS:X technology and deliver additional features, such as auto-sensing of IMAX Enhanced content, via IMAX Mode. IMAX Mode indicates that your A/V receiver supports fully immersive IMAX signature sound.

AUDIO DECODING	Onkyo TX-NR818	Onkyo TX-RZ840
Dolby Atmos
Dolby Atmos Height Virtualization
Dolby Atmos Music
Dolby TrueHD
Dolby Digital Plus
Dolby Surround Upmixer
Dolby Pro Logic	PLIIz
Dolby Digital EX
DTS:X
DTS Neural:X
DTS Virtual:X
DTS Neo	Neo:X
DTS-HD Master Audio
DTS-HD High Resolution Audio
DTS 96/24
DTS Express
DTS-ES	Discrete 6.1, Matrix 6.1
IMAX Enhanced
Auro 3D with Auro-Matic Upmixer

Onkyo TX-NR818 comes with 8 HDMI inputs. It has 2 outputs which work parallelly and output the same signal.

Onkyo TX-RZ840 comes with 7 HDMI inputs. It has 2 outputs - 1 Main and 1 Sub/Zone2.

• 1080/60p Passthrough on Onkyo TX-NR818: All inputs pass up to 1080p video signal.
  4K/60Hz Passthrough on Onkyo TX-RZ840: All inputs pass up to 4K/60p (RGB/YCbCr4:4:4) video signal.
• 4K Upscaling: Both receivers can upscale up to 4K/30p (Marvell Qdeo) from HDMI and analog sources.
• Analog To HDMI Upconversion: Both receivers support analog to HDMI Upconversion, so you can input your analog video sources and output them digitally via HDMI. This means that you will need only one HDMI cable to connect to your TV.
• BT.2020 Color Space: BT.2020 or Rec. 2020 is a color standard which delivers a wider color gamut compared to Rec. 709. It covers approximately 75% of the total visual spectrum while the Rec. 709 covers only 35% (available on Onkyo TX-RZ840 only).
• HDCP Copy Protection: Onkyo TX-NR818 is HDCP 2.2 and Onkyo TX-RZ840 is HDCP 2.3 compliant which is a requirement for 4K/HDR copy-protected content transmission.
• 3D Ready: Both receivers are able to pass 3D video through HDMI.

HDR (High Dynamic Range)

Onkyo TX-NR818 does not support HDR.

Onkyo TX-RZ840 supports HDR10, Dolby Vision and Hybrid Log-Gamma. High dynamic range video has greater dynamic range than standard dynamic range (SDR) video with brighter whites and deeper blacks. The result is greater contrast and more details in dark and bright areas, better color and depth.

VIDEO FEATURES	Onkyo TX-NR818	Onkyo TX-RZ840
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	2.3
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 1080p	up to 4K/60p (RGB/YCbCr4:4:4)
Video Signal Upscaling	up to 4K/30p (Marvell Qdeo)	1080p to 4K

TERMINALS	Onkyo TX-NR818	Onkyo TX-RZ840
HDMI Inputs	8 (1 front)	7 (1 front)
HDMI Outputs	2 (simultaneous)	2 (1 Main, 1 Sub/Zone2)
8K Inputs
USB Input	1 Front (for iPod/iPhone) and 1 Rear	1 (Rear)
USB DC Out Port
Optical Inputs	3 (1 front)	1
Optical Outputs
Coaxial Inputs	3	1
RCA Line Inputs	7 (1 front)	6
RCA Line Outputs
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	9.2	11.2 (barter to Zone 3 Pre/Line Out)
XLR Pre-outs
Composite Video Inputs	5 (1 front)	2
Composite Video Outputs	1
S-Video Inputs
S-Video Outputs
Component Video Inputs	2	1
Component Video Outputs	1

GENERAL	Onkyo TX-NR818	Onkyo TX-RZ840
Brand	Onkyo	Onkyo
Model	TX-NR818	TX-RZ840
Type	A/V Receiver	A/V Receiver
Country	Others	Europe
Release Year	2012	2019
Predecessor	Onkyo TX-NR809	Onkyo TX-RZ830
Successor	Onkyo TX-NR828	Onkyo TX-RZ50

AMPLIFIER	Onkyo TX-NR818	Onkyo TX-RZ840
Channels	7.2	9.2
Power Output	135 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	120 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	Linear
THX™ Certification	Select™2 Plus	Select™ (previously known as Select2)
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-NR818	Onkyo TX-RZ840
Digital Processing Crossover Network
Digital Signal Processing (DSP) Engine	Advanced 32-Bit Processing DSP Chip	32-bit Digital Signal Processing Engines
DAC	Burr-Brown	AKM AK4458
DAC Specs	192 kHz/24 Bit	384 kHz/32 Bit
Maximum Channel Processing	9.1	11.2
Air Studios Monitor Certification
Dolby Atmos
Dolby Atmos Height Virtualization
Dolby Atmos Music
Dolby TrueHD
Dolby Digital Plus
Dolby Surround Upmixer
Dolby Pro Logic	PLIIz
Dolby Digital EX
THX Listening Modes
Surround EX	also known as Dolby Digital Surround EX
DTS:X
DTS Neural:X
DTS Virtual:X
DTS Neo	Neo:X
DTS-HD Master Audio
DTS-HD High Resolution Audio
DTS 96/24
DTS Express
DTS-ES	Discrete 6.1, Matrix 6.1
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, WMA Lossless, Ogg, MP3, DSD, Dolby TruHD, LPCM, AAC	FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
High Resolution Music Playback via USB and/or Network	up to 192 kHz	up to 192 kHz
High Resolution Audio Formats via USB	FLAC, WAV, Apple Lossless, DSD, WMA Lossless, LPCM, AAC, Dolby TrueHD	FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD
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	PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
DTS Dialogue Control
Dialog Enhancement
Dialog Level Adjustment
Dialog normalization
Dialogue Lift	Screen Centered Dialog
Tone Control	Front L/R Channels	All Channels
Compressed Music Enhancer	Advanced Music Optimizer	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
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-NR818	Onkyo TX-RZ840
Auto Speaker Calibration System with Mic.	Audyssey MultEQ XT32	AccuEQ Advance with AccuReflex™
Audyssey App Support

VIDEO FEATURES	Onkyo TX-NR818	Onkyo TX-RZ840
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	2.3
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 1080p	up to 4K/60p (RGB/YCbCr4:4:4)
Video Signal Upscaling	up to 4K/30p (Marvell Qdeo)	1080p to 4K
Analog To HDMI Upconversion	Component, Composite, PC	Component**, Composite
Component Video Upscaling
Analog to Analog Video conversion
Component Video Maximum Resolution	1080p	480i/576i
isf Certified Calibration Control

CONNECTIVITY	Onkyo TX-NR818	Onkyo TX-RZ840
Wi-Fi	via Front USB (optional UWF-1 sold separately)
Bluetooth		SBC, AAC
Works with Amazon Alexa
Chromecast Built-In
Works with SonoS
DTS Play-Fi		via Onkyo Music Control app
MHL Input	Front HDMI
DLNA 1.5
AirPlay		AirPlay 2 after firmware update
Apple Product Connection	iPod and iPhone via front USB	iPod, iPhone and iPad
Remote App	iPod touch/iPhone and Android-Powered Devices	Onkyo Controller and Music Control apps
InstaPrevue Input Source Prevue

TERMINALS	Onkyo TX-NR818	Onkyo TX-RZ840
HDMI Inputs	8 (1 front)	7 (1 front)
HDMI Outputs	2 (simultaneous)	2 (1 Main, 1 Sub/Zone2)
8K Inputs
USB Input	1 Front (for iPod/iPhone) and 1 Rear	1 (Rear)
USB DC Out Port
Optical Inputs	3 (1 front)	1
Optical Outputs
Coaxial Inputs	3	1
RCA Line Inputs	7 (1 front)	6
RCA Line Outputs
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	9.2	11.2 (barter to Zone 3 Pre/Line Out)
XLR Pre-outs
Composite Video Inputs	5 (1 front)	2
Composite Video Outputs	1
S-Video Inputs
S-Video Outputs
Component Video Inputs	2	1
Component Video Outputs	1
Ethernet
Ethernet Switch
PC In
Front A/V Inputs	HDMI/MHL, USB, Composite Video, RCA Audio, Optical	HDMI
Speaker A/B
Headphone Out	6.3 mm (1/4")	6.3 mm (1/4")
Detachable Power Cord
uport

ZONES	Onkyo TX-NR818	Onkyo TX-RZ840
Number of Zones	3	3
Powered Zones	2 and 3	2 and 3
Zone 2 Outs	RCA Line Out	HDMI, RCA Pre/Line Out (shared with Zone B Line out)
Zone 3 Outs	RCA Line Out	RCA Pre/Line Out
Whole House Mode
RS-232C Interface
+12V Trigger Output	2 (Zone2, Zone 3)	1 (MAIN, 100 mA)
Remote (IR) Input/Output	1 / 1	1 / 0

MISCELLANEOUS	Onkyo TX-NR818	Onkyo TX-RZ840
On-Screen Display	Advanced "Home" GUI	Graphical User Interface with Overlaid On-Screen Display (OSD) via HDMI
GUI Languages		9
IP Control
ONKYO-RI System Control
RIHD (Remote Interactive Over HDMI)
Pre-Pro/Learning Remote	/
On Screen Remote Programming
Bi-directional Remote Setup via GUI
Activity Based Remote
Smart Grid-Ready

RADIO	Onkyo TX-NR818	Onkyo TX-RZ840
Analog Tuner	FM/AM with RDS	FM/AM with RDS
Presets	40	40
Digital Radio
Internet Radio	vTuner	TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM

CONSTRUCTION	Onkyo TX-NR818	Onkyo TX-RZ840
Solid Aluminum Front
Speaker Terminals	11	9
Large Speaker Terminals	11	9
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
Gold plated RCA terminals

POWER	Onkyo TX-NR818	Onkyo TX-RZ840
Power Supply	AC 220-240 V, 50/60 Hz	AC 220-240 V, 50/60 Hz
Independent Power Supply
H.C.P.S. (High Current Power Supply)	Massive High Power Transformer	Customized Transformer
Toroidal Transformer
Power Consumption	720 W	870 W
No Sound Power	90 W	70 W
Standby Power	0.1 W	0.15 W
ECO Mode / Hybrid Standby Function

PHYSICAL	Onkyo TX-NR818	Onkyo TX-RZ840
Dimensions (W x H x D)	435 mm x 198.5 mm x 435.5 mm 17-1/8" x 7-13/16" x 18-1/8"	435 mm x 201.5 mm x 398 mm 17-1/8" x 7-15/16" x 15-11/16"
Dimensions of Package (W x H x D)		570 mm x 335 mm x 490 mm 22-7/16" x 13-3/16" x 19-5/16"
Weight	18.3 kg (40.3 lbs)	14 kg (30.9 lbs)
Weight of Package		17.0 kg (37.5 lbs)

SPECIFICATIONS	Onkyo TX-NR818	Onkyo TX-RZ840
Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)	135 W (0.08% THD)
Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)	125 W (0.7% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)	230 W
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	180 W (1% THD)	180 W (1% THD)
Dynamic Power per Channel (3 Ω, Front)	300 W	250 W
Dynamic Power per Channel (4 Ω, Front)	250 W	220 W
Dynamic Power per Channel (8 Ω, Front)	150 W	130 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 (Line)	200 mV/47 kΩ
Input Sensitivity and Impedance (Phono MM)	2.5 mV/47 kΩ	3.5 mV/47 kΩ
Rated Preout Level and Impedance	200 mV/470 Ω	1 V/470 Ω
Maximum Preout Level and Impedance	4.6 V/470 Ω
Rated Headphone Power Output		85 mW (32 Ω, 1 kHz, 10% THD)
Phono Overload	70 mV (MM 1 kHz 0.5%)	70 mV (MM, 1 kHz 0.5%)
S/N Ratio (Line, IHF-A)	110 dB	106 dB
S/N Ratio (Phono MM, IHF-A)	80 dB	80 dB
Frequency Response (Analog In)	5 Hz - 100 kHz/+1 dB, -3 dB (Direct Mode)	5 Hz - 100 kHz/+1 dB, -3 dB (Direct/Pure Audio)
DSD Sampling Rates via HDMI	2.8 MHz	2.8 MHz
DSD Sampling Rates via USB	2.8 MHz	2.8 MHz, 5.6 MHz, 11.2 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	100BASE-TX	10BASE-T/100BASE-TX
Wi-Fi Standard		IEEE 802.11 a/b/g/n
Wi-Fi Terminal Frequency		5 GHz, 2.4 GHz
Bluetooth Version		4․2
Bluetooth Frequency		2.4 GHz
USB Terminal		Ver. 2.0, 5 V, 1 A
FM Frequency	87.5 MHz - 108.0 MHz	87.5 MHz - 108.0 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)		Mono: 1.0 µV (11.2 dBf)
AM Frequency	522/530 kHz - 1611/1710 kHz	522/530 kHz - 1611/1710 kHz
Warranty	2 Years	3 Years

* - 480i/576i and 480p/576p only
** - 480i/576i only
*** - no 1080p/24 upconversion
**** - 1080p signal is not converted