Onkyo TX-RZ3100 vs Onkyo TX-NR646

GENERAL	Onkyo TX-RZ3100	Onkyo TX-NR646
Brand	Onkyo	Onkyo
Model	TX-RZ3100	TX-NR646
Type	A/V Receiver	A/V Receiver
Country	Europe	Others
Release Year	2016	2015
Predecessor	Onkyo TX-NR3030	Onkyo TX-NR636
Successor		Onkyo TX-NR656

AMPLIFIER	Onkyo TX-RZ3100	Onkyo TX-NR646
Channels	11.2	7.2
Power Output	140 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	100 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)	All Channels
Optimum Gain Volume Circuitry
THX™ Certification	Select™2 Plus
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-RZ3100	Onkyo TX-NR646
Digital Signal Processing (DSP) Engine	32-bit Digital Signal Processing Engines	Dual 32-bit DSP for Powerful Advanced Processing
DAC	AKM AK4490 Stereo DAC for Front L/R 2 AKM AK4458 Multichannel DACs (x2) for Other Channels AKM AK4388 Stereo DACs (x2) for Zone 2 and Zone 3	Asahi Kasei AK4458
DAC Specs	384 kHz/32 Bit for Front L/R 768 kHz/32 Bit for Other Channels 192kHz/24 Bit for Zone 2 and Zone 3	384 kHz/32 Bit
Maximum Channel Processing	11.1	7.1
Air Studios Monitor Certification
Dolby Atmos		up to 5.1.2 after firmware update
Dolby Atmos Height Virtualization
Dolby Atmos Music
Dolby TrueHD
Dolby Digital Plus
Dolby Surround Upmixer
Dolby Pro Logic
Dolby Digital EX
THX Listening Modes
Surround EX
DTS:X		up to 5.1.2 after firmware update
DTS Neural:X		after firmware update
DTS Virtual:X
DTS Neo		Neo:6 until firmware update
DTS-HD Master Audio
DTS-HD High Resolution Audio
DTS 96/24
DTS Express
DTS-ES
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, MP3, DSD, AIFF, AAC, Dolby TrueHD	FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD
High Resolution Music Playback via USB and/or Network	up to 192 kHz	up to 96 kHz
High Resolution Audio Formats via USB	FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD	FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC
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 for S/PDIF Audio	PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
DTS Dialogue Control
Dialog Enhancement
Dialog Level Adjustment		DTS:X only
Dialog normalization
Dialogue Lift
Tone Control	All Channels	Front L/R 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		for Deep Bass and Clear Mid-Range
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-RZ3100	Onkyo TX-NR646
Auto Speaker Calibration System with Mic.	AccuEQ with AccuReflex™	AccuEQ Advance

VIDEO FEATURES	Onkyo TX-RZ3100	Onkyo TX-NR646
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 (5 inputs / 2 outputs)	2.2 (3 inputs / 2 outputs)
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 4K/60p (YCbCr4:4:4)	up to 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)
Video Signal Upscaling	1080p to 4K
Analog To HDMI Upconversion	Component**, Composite	Component**, Composite
Component Video Upscaling
Analog to Analog Video conversion
Component Video Maximum Resolution	1080i	480i/576i
isf Certified Calibration Control

CONNECTIVITY	Onkyo TX-RZ3100	Onkyo TX-NR646
Wi-Fi
Bluetooth	SBC, AAC
Works with Amazon Alexa
Chromecast Built-In
Works with SonoS	requires firmware update & Sonos Connect
DTS Play-Fi
MHL Input
DLNA 1.5
AirPlay	AirPlay 2 after firmware update	AirPlay
Apple Product Connection	iPod, iPhone and iPad	iPod, iPhone and iPad
Remote App	Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices	Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices
InstaPrevue Input Source Prevue

TERMINALS	Onkyo TX-RZ3100	Onkyo TX-NR646
HDMI Inputs	8 (1 front)	8 (1 front)
HDMI Outputs	2 (1 Main, 1 Sub/Zone2)	2 (simultaneous)
8K Inputs
USB Input	1 (Rear)	1 (Rear)
USB DC Out Port
Optical Inputs	3	2
Optical Outputs
Coaxial Inputs	2	1
RCA Line Inputs	6	7
RCA Line Outputs		1
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	11.2	0.2
XLR Pre-outs
Composite Video Inputs	2	3
Composite Video Outputs
S-Video Inputs
S-Video Outputs
Component Video Inputs	2	2
Component Video Outputs	1
Ethernet
Ethernet Switch
PC In
Front A/V Inputs	HDMI	HDMI
Speaker A/B
Headphone Out	6.3 mm (1/4")	6.3 mm (1/4")
Detachable Power Cord
uport

ZONES	Onkyo TX-RZ3100	Onkyo TX-NR646
Number of Zones	3	2
Powered Zones	2 and 3	2
Zone 2 Outs	HDMI, RCA Pre/Line Out	RCA Line Out
Zone 3 Outs	RCA Pre/Line Out
Whole House Mode
RS-232C Interface
+12V Trigger Output	1 (MAIN, 100 mA)	0
Remote (IR) Input/Output	1 / 0	0 / 0

MISCELLANEOUS	Onkyo TX-RZ3100	Onkyo TX-NR646
On-Screen Display	Graphical User Interface with Overlaid On-Screen Display (OSD) via HDMI with Quick Setup Function	Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up
ONKYO-RI System Control
RIHD (Remote Interactive Over HDMI)
Pre-Pro/Learning Remote	/	/
On Screen Remote Programming
Bi-directional Remote Setup via GUI
Smart Grid-Ready

RADIO	Onkyo TX-RZ3100	Onkyo TX-NR646
Analog Tuner	FM/AM with RDS	FM/AM with RDS
Presets	40	40
Digital Radio
Internet Radio	TuneIn	TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM

CONSTRUCTION	Onkyo TX-RZ3100	Onkyo TX-NR646
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-RZ3100	Onkyo TX-NR646
Power Supply	AC 220-230 V, 50/60 Hz	AC 220-240 V, 50/60 Hz
Independent Power Supply		2
H.C.P.S. (High Current Power Supply)	Customized High-Output Transformer	Massive High Power Transformer
Toroidal Transformer
Power Consumption	340 W	630 W
No Sound Power	100 W	70 W
Standby Power	0.2 W	0.15 W
Capacitor Bank		8,200 µF
ECO Mode / Hybrid Standby Function

PHYSICAL	Onkyo TX-RZ3100	Onkyo TX-NR646
Dimensions (W x H x D)	435 mm x 201 mm x 453 mm 17-1/8" x 7-15/16" x 17-13/16"	435 mm x 173.5 mm x 329 mm 17-1/8" x 6-13/16" x 12-15/16"
Weight	19.7 kg (43.4 lbs)	9.8 kg (21.6 lbs)

SPECIFICATIONS	Onkyo TX-RZ3100	Onkyo TX-NR646
Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)		100 W (0.08% THD)
Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)		170 W (0.9% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)	340 W (10% THD)	175 W
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	200 W (1% THD)	160 W (1% THD)
Dynamic Power per Channel (3 Ω, Front)	320 W	240 W
Dynamic Power per Channel (4 Ω, Front)	270 W	210 W
Dynamic Power per Channel (8 Ω, Front)	160 W	120 W
THD	0.04% (1 kHz, 100 W)	0.08% (20 Hz - 20 kHz, Half power)
Damping Factor		60 (Front, 1 kHz, 8 Ω)
Input Sensitivity and Impedance (Line)	200 mV/82 kΩ	200 mV/47 kΩ (Line)
Input Sensitivity and Impedance (Phono MM)	3.5 mV/47 kΩ	3.5 mV/47 kΩ (Phono mm)
Rated Preout Level and Impedance	1 V/330 Ω
Rated Headphone Jack Output Level and Impedance	43 Ω
Rated Headphone Power Output	57 mW (32 Ω, 1 kHz, 10% THD)
Phono Overload	70 mV (MM, 1 kHz 0.5%)	70 mV (MM, 1 kHz 0.5% Direct)
S/N Ratio (Line, IHF-A)	108 dB	100 dB
S/N Ratio (Phono MM, IHF-A)	90 dB	80 dB
Frequency Response (Analog In)		10 Hz - 100 kHz/+1 dB, -3 dB (Direct mode)
DSD Sampling Rates via HDMI	2.8 MHz	2.8 MHz, 5.6 MHz
DSD Sampling Rates via USB	2.8 MHz, 5.6 MHz, 11.2 MHz	2.8 MHz, 5.6 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)	5 Hz - 100 MHz/+0 dB, -3 dB (Component)
Ethernet Standard	10BASE-T/100BASE-TX	10BASE-T/100BASE-TX
Wi-Fi Standard	IEEE 802.11 a/b/g/n	IEEE 802.11 b/g/n
Wi-Fi Terminal Frequency	5 GHz, 2.4 GHz	2.4 GHz
Bluetooth Version	4․1 + LE	2․1 + EDR
Bluetooth Frequency	2.4 GHz	2.4 GHz
HDMI Terminal	OUT: 55 mA
USB Terminal	Ver. 2.0, 5 V, 1 A	5 V, 1 A
FM Frequency	87.5 MHz - 108.0 MHz	87.5 MHz - 108.0 MHz
AM Frequency	522/530 kHz - 1611/1710 kHz	522/530 kHz - 1611/1710 kHz
Warranty	3 Years	2 Years

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

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