Denon AVR-X6400H

Denon AVR-X6400H was introduced in 2017. It is equipped with 11 channel amplifier with 140 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, DTS:X and Auro-3D, passes 4K/60Hz and upscales up to 4K 50/60Hz 4:4:4 video signal.

We evaluated the a/v receiver and gave 93 overall score out of 100. 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    Evaluation section.

Here is a history of the series, where you can view and compare the main specifications of the receivers.

You can view their side-by-side comparison here: Denon AVC-X6800H vs AVC-X6700H vs AVC-X6500H vs AVR-X6400H vs AVR-X6300H vs AVR-X6200W.

In this section we present pros and cons of Denon AVR-X6400H.

In 2017 Denon released 5 new receivers. Here is the lineup:

You can view their side-by-side comparison here: Denon AVR-X6400H vs AVR-X4400H vs AVR-X3400H vs AVR-X2400H vs AVR-X1400H.

Denon AVR-X6400H has replaced AVR-X6300H. Here we present differences between these two models.

UPGRADES	Denon AVR-X6400H	vs	Denon AVR-X6300H
Bi-amp capability	5-ch (assignable)	vs	assignable
Higher DAC Specs	384 kHz/32 Bit	vs	192 kHz/24 Bit
D.D.S.C. HD Digital	32-bit	vs
Alpha Processing	AL32 Processing Plus	vs	AL24 Processing Plus
DTS Virtual:X	via firmware update	vs
Auro 3D with Auro-Matic Upmixer	Built-In	vs
Bass Sync		vs
Enhanced Audio Return Channel (eARC)		vs
Wi-Fi Standard	IEEE 802.11 a/b/g/n	vs	IEEE 802.11 b/g/n
Wider AM Frequency Range	522 kHz - 1611 kHz	vs	522 kHz - 1611 kHz

DOWNGRADES	Denon AVR-X6400H	vs	Denon AVR-X6300H
Mono Block Power Amplifier Construction		vs
Network Audio Formats	MP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, DSD	vs	MP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
Music Playback via USB	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD	vs	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
High Resolution Audio Formats via USB	Apple Lossless, WAV, FLAC, DSD	vs	Apple Lossless, WAV, FLAC, AIFF, DSD
Pandora		vs
SiriusXM		vs

For more detailed comparison between the models please visit Denon AVR-X6400H vs AVR-X6300H.

Denon AVR-X6400H's 11 channel amplifier can be assigned for different speaker configurations.

• Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
5.2.2, 5.2.4, 7.2.2, 7.2.4 with internal amplifier.
• DTS:X Configurations: The speaker configurations for DTS:X are the same as for Dolby Atmos:
5.2.2, 5.2.4, 7.2.2, 7.2.4 with internal amplifier.
• Configurations without height channels: There are also other speaker configurations available which do not include height channels:
5.2, 7.2 with internal amplifier.
• 5-ch Bi-Amp: Denon AVR-X6400H allows you to bi-amp up to 5 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

Denon AVR-X6400H supports Dolby Atmos with Surround Upmixer.

• 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.

DTS:X

Denon AVR-X6400H supports DTS:X with Neural:X and Virtual:X.

• Neural:X 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.
• Virtual:X bridges the gap between DTS:X codec and the reality of so many consumers' homes, allowing you to enjoy multi-dimensional sound regardless of room size, layout, or speaker configuration. If you have a limited speaker setup you will miss a full immersive potential of your entertainment system. DTS Virtual:X adds height and surround audio effect to your system without adding height speakers. It works with multiple configurations and delivers immersive sound experience out of 5.1 or even 2.1 speaker layouts.
• 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.

Auro-3D

Denon AVR-X6400H supports Auro-3D. It is an immersive 3D audio format developed by the Belgium-based company Auro Technologies.

• Auro-Matic upmixer takes non Auro-3D sound and upmixes to the current speaker configuration.

DECODING
Dolby Atmos	up to 7.1.4
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 7.1.4
DTS Neural:X
DTS Virtual:X	via firmware update
DTS Neo
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	Built-In

Denon AVR-X6400H features 8 HDMI inputs. It has 3 outputs: 2 for MAIN and 1 for ZONE2.

• 4K/60Hz Passthrough: All inputs pass up to 4K 50/60Hz 4:4:4 video signal.
• 4K Upscaling: Denon AVR-X6400H can upscale up to 4K 50/60Hz 4:4:4 from HDMI and analog sources.
• Analog To HDMI Upconversion: The a/v receiver supports video upconversion, so you can connect your analog Component and Composite video sources and Denon AVR-X6400H will output them 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%.
• HDCP 2.2 Copy Protection: All inputs and outputs are HDCP 2.2 compliant which is a requirement for 4K/HDR copy-protected content transmission.
• 3D Ready: Denon AVR-X6400H is able to pass 3D video through HDMI.

HDR (High Dynamic Range)

Denon AVR-X6400H supports HDR (high dynamic range) video formats such as HDR10, Dolby Vision and Hybrid Log-Gamma via HDMI ports. 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.

Enhanced Audio Return Channel (eARC)

Audio Return Channel (ARC) feature allows the compatible TV to send audio signal to the a/v receiver through the same HDMI cable which is used to send audio and video signals to the TV. So one HDMI cable is used to transfer audio signal in both directions. New Enhanced ARC will support uncompressed audio formats such as Dolby Atmos, DTS:X, Dolby TrueHD and DTS HD Master Audio whereas the previous ARC could support only Dolby Digital, Dolby Digital Plus, DTS, DTS HD, and PCM.

Gaming Features

Denon AVR-X6400H supports Auto Low Latency Mode (ALLM) for lag-free and smooth gaming.

VIDEO FEATURES
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
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 50/60Hz 4:4:4
Video Signal Upscaling	up to 4K 50/60Hz 4:4:4

Denon AVR-X6400H comes with Audyssey MultEQ XT32 room correction system and includes the calibration microphone. It also supports Audyssey App.

• Audyssey Room Calibration: Audyssey is an acoustic measurement technology which automatically restores the acoustic distortion caused by the acoustic behaviour of a room with only a push on a button. Audyssey equalization provides an clear, accurate, natural sound with voices and dialog that become focused and intelligible, restoring the musical balance. Musical instruments and sound effects become precisely localized and the surround soundstage is made seamless and enveloping.

Denon AVR-X6400H offers multi-zone playback which allows you to play different input sources in 3 different rooms.

Zone 2

• Powered Zone 2: You can use the unit's 2 amplifier channels by connecting Zone 2 speakers directly to the speaker terminals. The remaining 9 channels will be left for main zone amplification.
• HDMI Output: Denon AVR-X6400H offers HDMI output for Zone 2. This means that it can send two different HDMI signals to two displays.
• Audio Pre Output: If you have a dedicated power amplifier for Zone 2 you can connect it to the a/v receiver via pre outs and control volume from the a/v receiver.
• Composite Video Output: Denon AVR-X6400H has analog Composite Video output for Zone 2. This means that it can send a different video signal to the TV.
• Component Video Output: Denon AVR-X6400H has analog Component Video output for Zone 2, so you can send a different video signal to the TV. Component video connection provides the higher image quality than the composite and S-Video connections.

Zone 3

• Powered Zone 3: You can use the unit's 2 amplifier channels by connecting Zone 3 speakers directly to the speaker terminals. The remaining 9 channels will be left for main zone amplification.
• Audio Pre Output: If you have a dedicated power amplifier for Zone 3 you can connect it to the a/v receiver via pre outs and control volume from the a/v receiver.

Audio

• Phono Input: There is an MM phono input with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the a/v receiver.
• Analog Pre-Outs: Denon AVR-X6400H has 11.2 preamplifier outputs which allow you to connect the a/v receiver to the external power amplifier. You may want to use a high quality external amplifier for certain channels, usually for front L/R and center, and use the a/v receiver to power the rest.
• Analog Line Inputs: There are 7 line inputs for analog audio connection.
• Digital Inputs: 2 optical inputs and 2 coaxial inputs are available for digital audio connection.
• Headphone Output: There is a 6.3 mm (1/4") headphone output jack on the front panel.

Video

• HDMI:
Inputs: 8 (1 front)   Outputs: 3 (2 for MAIN, 1 for ZONE2)
8K Inputs: 0
• Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
Inputs: 5   Outputs: 1
• Component Video: Component video connection gives you the higher quality video compared to the composite video connection. So in case your old DVD player and other equipment do not have an HDMI output but have Component video output use this connection over the composite one. Denon AVR-X6400H supports up to 1080p resolution on Component video connectors.
Inputs: 2   Outputs: 1

Front A/V Inputs

• HDMI, USB, Composite, L/R Audio

In 2018 Denon AVR-X6400H was replaced by Denon AVC-X6500H. Let us now have a look at some important differences between Denon AVR-X6400H and its successor.

UPGRADES	Denon AVC-X6500H	vs	Denon AVR-X6400H
IMAX Enhanced		vs

DOWNGRADES	Denon AVC-X6500H	vs	Denon AVR-X6400H
Less Composite Video Inputs	4	vs	5 (1 front)
Front A/V Inputs	HDMI, USB	vs	HDMI, USB, Composite, L/R Audio
Analog Tuner		vs	FM/AM with RDS

For more detailed comparison between the models please visit Denon AVR-X6400H vs AVC-X6500H.

GENERAL
Brand	Denon
Model	AVR-X6400H
Type	A/V Receiver
Country	UK
Release Year	2017
Predecessor	Denon AVR-X6300H
Successor	Denon AVC-X6500H

AMPLIFIER
Channels	11.2
Power Output	140 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
Front Wide Channel Support
Amplifier Design	Monolithic
Discrete Amplification
THX™ Certification
Continuous 6 Ω Rated
Certified 4 Ω Performance
Mono Block Power Amplifier Construction
Bi-amp Capability	5-ch (assignable)

AUDIO FEATURES
Digital Signal Processing (DSP) Engine	4 powerful high speed 4th generation SHARC DSP processors
DAC	AKM AK4458VN
DAC Specs	384 kHz/32 Bit
Maximum Channel Processing	11.2
D.D.S.C. HD Digital	32-bit
Alpha Processing	AL32 Processing Plus
Air Studios Monitor Certification
Dolby Atmos	up to 7.1.4
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 7.1.4
DTS Neural:X
DTS Virtual:X	via firmware update
DTS Neo
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	Built-In
PCM	2-ch/Multi-ch Input
Network Audio Formats	MP3, WMA, MPEG-4 AAC, Apple Lossless, WAV, FLAC, DSD
Music Playback via USB	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD
High Resolution Music Playback via USB and/or Network	up to 192 kHz
High Resolution Audio Formats via USB	Apple Lossless, WAV, FLAC, DSD
Gapless Playback
DSD via HDMI	2-ch/Multi-ch Input
DSD via USB	2-ch Input
DSD to PCM Converter
USB DAC
Jitter Reduction
DTS Dialogue Control
Dialog Enhancement
Dialog Level Adjustment
Dialog normalization
Dialogue Lift
Compressed Music Enhancer
High-resolution Music Enhancer
Audyssey Dynamic EQ
Audyssey Dynamic Volume
Audyssey LFC
Audyssey Sub EQ HT
Audyssey DSX
Direct Mode
Pure Direct Mode
Independent Subwoofer Outputs

CALIBRATION
Auto Speaker Calibration System with Mic.	Audyssey MultEQ XT32
Audyssey App Support
Optimized Bass Redirection
Bass Sync

VIDEO FEATURES
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
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 50/60Hz 4:4:4
Video Signal Upscaling	up to 4K 50/60Hz 4:4:4
Analog To HDMI Upconversion	Component, Composite
Component Video Upscaling
Analog to Analog Video conversion
Component Video Maximum Resolution	1080p
isf Certified Calibration Control

CONNECTIVITY
Wi-Fi
Bluetooth	SBC
Bluetooth Headphone Transmission
Works with Amazon Alexa
Chromecast Built-In
Works with SonoS
HEOS
DTS Play-Fi
MHL Input
DLNA 1.5
AirPlay	AirPlay 2
Apple Product Connection	iPod, iPhone and iPad
Remote App	Denon 2016 AVR Remote App for iOS and Android devices and Kindle Fire
InstaPrevue Input Source Prevue

TERMINALS
HDMI Inputs	8 (1 front)
HDMI Outputs	3 (2 for MAIN, 1 for ZONE2)
8K Inputs
USB Input	1 (Front) for iPod/iPhone and USB memory
USB DC Out Port
Optical Inputs	2
Optical Outputs
Coaxial Inputs	2
RCA Line Inputs	7 (1 front)
RCA Line Outputs
XLR Line Inputs
Phono Input
Multi-Channel Input
RCA Pre-Outs	11.2
XLR Pre-outs
Composite Video Inputs	5 (1 front)
Composite Video Outputs	1
S-Video Inputs
S-Video Outputs
Component Video Inputs	2
Component Video Outputs	1
Ethernet
Ethernet Switch
PC In
Front A/V Inputs	HDMI, USB, Composite, L/R Audio
Speaker A/B	assignable
Headphone Out	6.3 mm (1/4")
Detachable Power Cord

ZONES
Number of Zones	3
Powered Zones	2 and 3
Zone 2 Outs	HDMI, Component, Composite, Pre Out
Zone 3 Outs	Pre Out
RS-232C Interface
+12V Trigger Output	2
Remote (IR) Input/Output	1 / 1

MISCELLANEOUS
On-Screen Display	Advanced Graphic User Interface
GUI Languages	9
Control4 SDDP
Display	2 lines
Remote Controller	RC-1219
Pre-programmed / Learnable / LCD Display	/ /
Denon Link HD
Setup Assistant
Quick Select plus / Quick Select	/

RADIO
Analog Tuner	FM/AM with RDS
Digital Radio
Internet Radio	TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM

CONSTRUCTION
Front Panel	Metal
Speaker Terminals	11
Large Speaker Terminals	11
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
High Grade Audio Components
Gold plated RCA terminals

POWER
Power Supply	AC 230 V, 50/60 Hz
Power Consumption	750 W
No Sound Power	ECO On/Off: 65 W/110 W
Standby Power	0.1 W
ECO Mode / Hybrid Standby Function
Auto Power off

PHYSICAL
Dimensions (W x H x D)	434 mm x 167 mm x 393 mm (with antenna: 434 mm x 235 mm x 393 mm) 17 1/8" x 6 5/8" x 15 1/2" (with antenna: 17 1/8" x 9 3/8" x 15 1/2")
Weight	14.5 kg (31 lbs 15 oz)

SPECIFICATIONS
Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)	140 W (0.05% THD)
Power Output (6 Ω, 1 kHz, 2 channel driven, FTC)	175 W (0.7% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA or IEC)	250 W (10% THD)
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	205 W (1% THD)
Dynamic Power per Channel (4 Ω, Front)	250 W x 2-channel
Dynamic Power per Channel (8 Ω, Front)	160 W x 2-channel
THD (Digital)	0.008% (1 kHz, at 0 dB)
Analog Distortion	0.005% (20 Hz-20 kHz, Direct mode)
Phono Distortion	0.03% (1 kHz, 3 V)
Input Sensitivity and Impedance (Line)	200 mV/47 kΩ
Input Sensitivity and Impedance (Phono MM)	2.5 mV
Rated Lineout Level and Impedance	1.2 V
Rated Output digital	2 V (at 0 dB playback)
S/N Ratio (Line, IHF-A)	102 dB
S/N Ratio (Phono MM, IHF-A)	74 dB
S/N Ratio (digital)	102 dB
Dynamic Range (digital)	100 dB
Phono RIAA Deviation	±1 dB (20 Hz to 20 kHz)
Frequency Response (Analog In)	+1/-3 dB (10 Hz to 100 kHz, Direct mode)
DSD Sampling Rates via HDMI	2.8 MHz
DSD Sampling Rates via USB	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)
Video Frequency Response	5 Hz to 60 MHz, 0 dB/-3 dB (Component)
Ethernet Standard	100BASE-TX
Wi-Fi Standard	IEEE 802.11 a/b/g/n
Wi-Fi Terminal Frequency	5 GHz, 2.4 GHz
Bluetooth Version	3․0 + EDR
Bluetooth Frequency	2.4 GHz
USB Terminal	USB2.0 5V, 1 A
FM Frequency	87.5 MHz - 108.0 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)	Mono: 2.8 µV (20.2 dBf)
FM Effective Sensitivity	1.2 µV (12.8 dBf)
FM S/N Ratio	Mono/Stereo: 70 dB/67 dB
FM Harmonic Distortion (IHF, 1 kHz)	Mono/Stereo: 0.7%/1.0%
AM Frequency	522 kHz - 1611 kHz
AM Effective Sensitivity	18 µV
Warranty	3 Years

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