Onkyo TX-NR646 vs Yamaha RX-A880

GENERAL	Onkyo TX-NR646	Yamaha RX-A880
Brand	Onkyo	Yamaha
Series		Aventage
Model	TX-NR646	RX-A880
Type	A/V Receiver	A/V Receiver
Country	Others	Taiwan
Release Year	2015	2018
Predecessor	Onkyo TX-NR636	Yamaha RX-A870
Successor	Onkyo TX-NR656	Yamaha RX-A2A

AMPLIFIER	Onkyo TX-NR646	Yamaha RX-A880
Channels	7.2	7.2
Power Output	100 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
WRAT (Wide Range Amplifier Technology)
VLSC (Vector Linear Shaping Circuitry)
Optimum Gain Volume Circuitry
THX™ Certification
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-NR646	Yamaha RX-A880
Digital Signal Processing (DSP) Engine	Dual 32-bit DSP for Powerful Advanced Processing
Surround:AI™
DAC	Asahi Kasei AK4458	Burr-Brown DAC x 4 for main zone
DAC Specs	384 kHz/32 Bit	384 kHz/32 Bit
Maximum Channel Processing	7.1	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
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	Neo:6
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		MP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
Music Playback via USB	FLAC, WAV, Apple Lossless, WMA, WMA Lossless, Ogg, MP3, DSD, AAC, LPCM, Dolby TrueHD	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
High Resolution Music Playback via USB and/or Network	up to 96 kHz	up to 192 kHz/32 Bit
High Resolution Audio Formats via USB	FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC	Apple Lossless, WAV, FLAC, AIFF, DSD
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
DTS Dialogue Control
Dialog Enhancement
Dialog Level Adjustment	DTS:X only
Dialog normalization
Dialogue Lift		no presence speakers required
Tone Control	Front L/R Channels
Compressed Music Enhancer	Advanced Music Optimizer (bluetooth included)
High-resolution Music Enhancer
Adaptive DRC (Dynamic Range Control)
Initial Volume & Maximum Volume Setting
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
Straight Decoding Mode
Pure Direct Mode		with Video On mode
CINEMA DSP		3D
DSP Programs		17
SILENT CINEMA / Virtual CINEMA DSP		Virtual CINEMA FRONT
Virtual Speakers	T-D (Theater-Dimensional)	including surround back
Independent Subwoofer Outputs

CALIBRATION	Onkyo TX-NR646	Yamaha RX-A880
Auto Speaker Calibration System with Mic.	AccuEQ Advance	YPAO sound optimization (R.S.C. with Multipoint measurement)
YPAO Volume
PEQ for SUB		Down to 15.6 Hz

VIDEO FEATURES	Onkyo TX-NR646	Yamaha RX-A880
HDR10
HDR10+
Dynamic HDR
BT.2020 color space
Dolby Vision
HLG (Hybrid Log Gamma)
HDBaseT Compatible
Enhanced Audio Return Channel (eARC)		via future firmware update
HDCP Version	2.2 (3 inputs / 2 outputs)	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 4K/60p (RGB/YCbCr4:4:4/YCbCr4:2:2, 24 bit)	up to 4K/60p 4:4:4
Video Signal Upscaling		up to 4K 60p 4:4:4
Analog To HDMI Upconversion	Component**, Composite	Component**, Composite
Component Video Upscaling
Analog to Analog Video conversion
Component Video Maximum Resolution	480i/576i	480i/576i
isf Certified Calibration Control

CONNECTIVITY	Onkyo TX-NR646	Yamaha RX-A880
Wi-Fi
Bluetooth		SBC, AAC
Works with Amazon Alexa		on MusicCast (Voice control using your Alexa device like Echo or Echo Dot)
Google Assistant
Chromecast Built-In
Works with SonoS
DTS Play-Fi
MHL Input
DLNA 1.5
MusicCast
AirPlay	AirPlay	AirPlay 2 via firmware update
Apple Product Connection	iPod, iPhone and iPad	iPod, iPhone and iPad
Remote App	Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices	(iPhone® / iPad® / Android™ phone / tablet)
InstaPrevue Input Source Prevue

TERMINALS	Onkyo TX-NR646	Yamaha RX-A880
HDMI Inputs	8 (1 front)	7
HDMI Outputs	2 (simultaneous)	2
8K Inputs
USB Input	1 (Rear)	USB memory, Portable Audio Player
USB DC Out Port
Optical Inputs	2	2
Optical Outputs
Coaxial Inputs	1	2
RCA Line Inputs	7	4 (1 front)
RCA Line Outputs	1
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	0.2	7.2
XLR Pre-outs
Composite Video Inputs	3	1
Composite Video Outputs
S-Video Inputs
S-Video Outputs
Component Video Inputs	2	1
Component Video Outputs
Ethernet
Ethernet Switch
PC In
Front A/V Inputs	HDMI	USB, mini-jack Audio
Speaker A/B
Headphone Out	6.3 mm (1/4")	6.3 mm (1/4")
Detachable Power Cord
uport
dockport

ZONES	Onkyo TX-NR646	Yamaha RX-A880
Number of Zones	2	2
Powered Zones	2	Zone 2
Zone 2 Outs	RCA Line Out	RCA Preout
Zone B Video Output		HDMI
Zone GUI
Whole House Mode
RS-232C Interface
+12V Trigger Output	0	1
Remote (IR) Input/Output	0 / 0	1 / 1
Party Mode

MISCELLANEOUS	Onkyo TX-NR646	Yamaha RX-A880
On-Screen Display	Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up	Graphical User Interface
SCENE		SCENE (8 sets)
Web Control
PreAmp Mode
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-NR646	Yamaha RX-A880
Analog Tuner	FM/AM with RDS	FM/AM
Presets	40	40
Digital Radio
Internet Radio	TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM

CONSTRUCTION	Onkyo TX-NR646	Yamaha RX-A880
Solid Aluminum Front
A.R.T. Wedge
Speaker Terminals	9	9
Large Speaker Terminals	9	9
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
Gold plated RCA terminals

POWER	Onkyo TX-NR646	Yamaha RX-A880
Power Supply	AC 220-240 V, 50/60 Hz	AC 110-120 V, 50/60 Hz
Independent Power Supply	2
H.C.P.S. (High Current Power Supply)	Massive High Power Transformer
Toroidal Transformer
Power Consumption	630 W	270 W
Maximum Power Consumption		590 W
No Sound Power	70 W
Standby Power	0.15 W	0.1 W
Capacitor Bank	8,200 µF
ECO Mode / Hybrid Standby Function
Auto Power Standby

PHYSICAL	Onkyo TX-NR646	Yamaha RX-A880
Dimensions (W x H x D)	435 mm x 173.5 mm x 329 mm 17-1/8" x 6-13/16" x 12-15/16"	435 mm x 171 mm x 380 mm (with antenna: 435 mm x 248 mm x 380 mm) 17-1/8" x 6-3/4" x 15" (with antenna up: 17-1/8" x 9-3/4" x 15")
Weight	9.8 kg (21.6 lbs)	11.0 kg (23.4 lbs)

SPECIFICATIONS	Onkyo TX-NR646	Yamaha RX-A880
Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)	100 W (0.08% THD)	100 W (0.06% THD)
Rated Power Output (8 Ω, 1 kHz, 1 channel Driven)		130 W (0.9% THD)
Maximum Effective Output Power (8 Ω, 1 kHz, 1 channel Driven, JEITA)		160 W (10% 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)	175 W	160 W (10% THD)
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	160 W (1% THD)
Dynamic Power per Channel (2 Ω, Front)		240 W
Dynamic Power per Channel (3 Ω, Front)	240 W
Dynamic Power per Channel (4 Ω, Front)	210 W	195 W
Dynamic Power per Channel (6 Ω, Front)		170 W
Dynamic Power per Channel (8 Ω, Front)	120 W	130 W
THD	0.08% (20 Hz - 20 kHz, Half power)	0.06% (AV 2 etc. to Front, Pure Direct, 20 Hz - 20 kHz, 50 W, 8 Ω)
THD (Phono)		0.02% (Phono to SPEAKER OUT (Front), 20 Hz - 20 kHz, 1 V)
Damping Factor	60 (Front, 1 kHz, 8 Ω)	100 (Front, 20 Hz - 20 kHz, 8 Ω)
Input Sensitivity and Impedance (Line)	200 mV/47 kΩ (Line)	200 mV/47 kΩ
Input Sensitivity and Impedance (Phono MM)	3.5 mV/47 kΩ (Phono mm)	3.5 mV/47 kΩ
Maximum Input Sensitivity (Line)		2.3 V (1 kHz, 0.5% THD)
Maximum Input Sensitivity (Phono)		60 mV (1 kHz, 0.1% THD)
Rated Preout Level and Impedance		1.0 V/2.7 kΩ (Front)
Maximum Preout Level and Impedance		1.6 V
Rated Headphone Jack Output Level and Impedance		100 mV/560 Ω (1 kHz, 50 mV, 8 Ω)
Phono Overload	70 mV (MM, 1 kHz 0.5% Direct)
S/N Ratio (Line, IHF-A)	100 dB	110 dB
S/N Ratio (Phono MM, IHF-A)	80 dB	96 dB
Phono RIAA Deviation		±0.5 dB (20 Hz - 20 kHz)
Frequency Response (Analog In)	10 Hz - 100 kHz/+1 dB, -3 dB (Direct mode)	+0/-3 dB (AV 2 etc. to Front, 10 Hz to 100 kHz)
Residual noise (IHF-A Network)		150 µV (Speaker Out)
Channel Separation at 1 kHz/10 kHz (LINE)		70 dB/50 dB
Channel Separation at 1 kHz/10 kHz (Phono)		60 dB/55 dB
DSD Sampling Rates via HDMI	2.8 MHz, 5.6 MHz	2.8 MHz
DSD Sampling Rates via USB	2.8 MHz, 5.6 MHz	11.2 MHz, 5.6 MHz, 2.8 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 Maximum Input		1.5 Vp-p
Video Frequency Response	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 b/g/n	IEEE 802.11 a/b/g/n/ac
Wi-Fi Terminal Frequency	2.4 GHz	2.4 GHz, 5 GHz
Bluetooth Version	2․1 + EDR	4․2
Bluetooth Frequency	2.4 GHz	2.4 GHz
USB Terminal	5 V, 1 A	USB2.0 5 V, 1 A
FM Frequency	87.5 MHz - 108.0 MHz	87.5/87.50 MHz - 108.0/108.00 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)		Mono: 3 µV (20.8 dBf)
FM S/N Ratio		Mono/Stereo: 69 dB/67 dB
FM Harmonic Distortion (IHF, 1 kHz)		Mono/Stereo: 0.5%/0.6%
AM Frequency	522/530 kHz - 1611/1710 kHz	530/531 kHz - 1710/1611 kHz
Warranty	2 Years	3 Years

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

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