Onkyo TX-NR646 vs Pioneer SC-LX501

GENERAL	Onkyo TX-NR646	Pioneer SC-LX501
Brand	Onkyo	Pioneer
Series		Elite
Model	TX-NR646	SC-LX501
Type	A/V Receiver	A/V Receiver
Country	Europe, Australia and Asia	Asia
Release Year	2015	2017
Predecessor	Onkyo TX-NR636	Pioneer SC-91
Successor	Onkyo TX-NR656	Pioneer SC-LX502

AMPLIFIER	Onkyo TX-NR646	Pioneer SC-LX501
Channels	7.2	7.2
Power Output	100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)	120 W (8 Ω, 1 kHz, 2 channel driven)
Front Wide Channel Support
Amplifier Design		Class D3 (Direct Energy HD)
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	Pioneer SC-LX501
Digital Signal Processing (DSP) Engine	Dual 32-bit DSP for Powerful Advanced Processing	Cirrus Logic (Quad Core) x 1
DAC	Asahi Kasei AK4458	AKM AK4458
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
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, Dolby TrueHD
High Resolution Music Playback via USB and/or Network	up to 96 kHz	64, 88.2, 96, 176.4, 192 kHz/24 bit
High Resolution Audio Formats via USB	FLAC, WAV, WMA Lossless, Apple Lossless, DSD, AAC	Apple Lossless, WAV, FLAC, AIFF, AAC, DSD, 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 for S/PDIF Audio
DTS Dialogue Control
Dialog Enhancement
Dialog Level Adjustment	DTS:X only
Dialog normalization
Dialogue Lift
Sound Retriever		Advanced
Sound Retriever AIR
Digital noise Reduction
Tone Control	Front L/R Channels	All Channels
Compressed Music Enhancer	Advanced Music Optimizer (bluetooth included)	Advanced Sound Retriever
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
Pure Direct Mode
Auto Surround
Optimum Surround
Advanced Surround		11 + 1
Wide Surround
Front Stage Surround Advance
Headphone Surround
Virtual Speakers	T-D (Theater-Dimensional)
Virtual Depth
Independent Subwoofer Outputs

CALIBRATION	Onkyo TX-NR646	Pioneer SC-LX501
Auto Speaker Calibration System with Mic.	AccuEQ Advance	MCACC
Manual MCACC
MCACC Memory		1
Reflex Optimizer
Phase Control
Auto Phase Control Plus
Full Band Phase Control
Standing Wave Control
EQ Bands		9-Band
Symmetric EQ
X-Curve
Distance Adjustment		0.1 feet
Precision Distance
Polarity Check
Auto Subwoofer Crossover

VIDEO FEATURES	Onkyo TX-NR646	Pioneer SC-LX501
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 (3 inputs / 2 outputs)	2.2
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 (YCbCr 4:4:4)
Video Signal Upscaling		up to 4K/60p (YCbCr 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
Stream Smoother
Pure Cinema
Video Parameter Adjustments
Super Resolution
isf Certified Calibration Control

CONNECTIVITY	Onkyo TX-NR646	Pioneer SC-LX501
Wi-Fi
Bluetooth		SBC, AAC
Works with Amazon Alexa
Chromecast Built-In
Works with SonoS
DTS Play-Fi
MHL Input
DLNA 1.5
AirPlay	AirPlay	AirPlay
Apple Product Connection	iPod, iPhone and iPad	Made for iPhone, iPod and iPad (Airplay only)
Remote App	Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices	iControlAV5 (for iOS and Android)
InstaPrevue Input Source Prevue

TERMINALS	Onkyo TX-NR646	Pioneer SC-LX501
HDMI Inputs	8 (1 front)	7 (1 front)
HDMI Outputs	2 (simultaneous)	2 (1 MAIN, 1 SUB/ZONE 2)
8K Inputs
USB Input	1 (Rear)	1 Front
USB DC Out Port
Optical Inputs	2	2
Optical Outputs
Coaxial Inputs	1	1
RCA Line Inputs	7	4
RCA Line Outputs	1
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	0.2	0.2
XLR Pre-outs
Composite Video Inputs	3	2
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	HDMI, USB
Speaker A/B
Headphone Out	6.3 mm (1/4")	6.3 mm (1/4")
Detachable Power Cord
uport
adapterport

ZONES	Onkyo TX-NR646	Pioneer SC-LX501
Number of Zones	2	2
Powered Zones	2	2
Zone 2 Outs	RCA Line Out	HDMI, RCA Pre/Line Out
Whole House Mode
RS-232C Interface
+12V Trigger Output	0	2 (A: 100 mA, B: 25 mA)
Remote (IR) Input/Output	0 / 0	1 / 1

MISCELLANEOUS	Onkyo TX-NR646	Pioneer SC-LX501
On-Screen Display	Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up	Icon-based Graphical User Interface (GUI)
GUI Languages		9
AV Navigator
IP Control
PreAmp Mode
Versatile Speaker Configuration		Surround Back/Front Height/Top/Front Bi-Amp/Zone 2/B Speaker
FL Dimmer
Function Rename
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	Pioneer SC-LX501
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-NR646	Pioneer SC-LX501
Front Panel		Brushed
Solid Aluminum Front
Speaker Terminals	9	9
Large Speaker Terminals	9	9
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
3D Space Frame Construction
Gold plated RCA terminals

POWER	Onkyo TX-NR646	Pioneer SC-LX501
Power Supply	AC 220-240 V, 50/60 Hz	AC 220-230/240 V, 50/60 Hz
Independent Power Supply	2
H.C.P.S. (High Current Power Supply)	Massive High Power Transformer
Toroidal Transformer
Low Leakage Flux Power Transformer
Transformer Stabilizer
Power Consumption	630 W	250 W
No Sound Power	70 W	60 W
Standby Power	0.15 W	0.2 W
Capacitor Bank	8,200 µF
ECO Mode / Hybrid Standby Function
Auto Power off

PHYSICAL	Onkyo TX-NR646	Pioneer SC-LX501
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 185 mm x 395 mm 17-1/8" x 7-5/16" x 15-9/16"
Weight	9.8 kg (21.6 lbs)	12.0 kg (26.5 lbs)

SPECIFICATIONS	Onkyo TX-NR646	Pioneer SC-LX501
Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)	100 W (0.08% THD)
Power Output (8 Ω, 1 kHz, 2 channel Driven, FTC)		120 W (0.08% THD)
Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)		150 W (1.0% THD)
Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)	170 W (0.9% THD)	180 W (1% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)	175 W
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	160 W (1% THD)
Power Output (4 Ω, 1 kHz, 2 channel Driven)		200 W (1.0% THD)
Rated Power Output (4 Ω, 1 kHz, 1 channel Driven)		220 W (1% THD)
Maximum Power Output (4 Ω, 1 kHz, 1 channel Driven)		320 W (10% THD)
Multi Channel Simultaneous Drive		560 W (8 Ω, 1 kHz, 1.0%)
Dynamic Power per Channel (3 Ω, Front)	240 W
Dynamic Power per Channel (4 Ω, Front)	210 W
Dynamic Power per Channel (8 Ω, Front)	120 W
THD	0.08% (20 Hz - 20 kHz, Half power)	0.05% (1 kHz, 100 W)
Damping Factor	60 (Front, 1 kHz, 8 Ω)
Input Sensitivity and Impedance (Line)	200 mV/47 kΩ (Line)	200 mV/82 kΩ
Input Sensitivity and Impedance (Phono MM)	3.5 mV/47 kΩ (Phono mm)	3.5 mV/47 kΩ
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% Direct)	70 mV (MM, 1 kHz, 0.5%)
S/N Ratio (Line, IHF-A)	100 dB	105 dB
S/N Ratio (Phono MM, IHF-A)	80 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, 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 B/R) 1 Vp-p/75 Ω (Composite)
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
Wi-Fi Terminal Frequency	2.4 GHz	5 GHz, 2.4 GHz
Bluetooth Version	2․1 + EDR	4․1 + LE
Bluetooth Frequency	2.4 GHz	2.4 GHz
HDMI Output Type		5 V, 55 mA
USB Terminal	5 V, 1 A	USB2.0 (Type 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	2 Years	3 Years Parts & Labor

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

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