Denon AVR-X6400H Review and Specs
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Denon AVR-X6400H (USA version)

SCORE:
94

Highlights

  • 11.2 channels
  • 140 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • Dolby Atmos, DTS:X, Auro 3D capable
  • HDR10, Dolby Vision, 4K Upscaling, 4K Passthrough
  • AirPlay 2, DLNA, HEOS
  • Ethernet, Wi-Fi, Bluetooth
  • USB and Phono inputs

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Denon AVR-X6400H Overview

Denon AVR-X6400H was introduced in 2017. It is equipped with 11 channel amplifier and is capable of 11.2 maximum channel processing.

We evaluated the Receiver and gave 94 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.

AMPLIFIER
94
VIDEO FEATURES
96
AUDIO FEATURES
93
CONNECTIVITY
91
MULTIZONE
93
MISCELLANEOUS
90
RADIO
96
OVERALL
94

Amplifier score is based on power ratings, minimum impedance load, power supply, transformer type, total harmonic distortion, damping factor, signal to noise ratio and other small details. Audio score depends on the number of channels, front wide channel support, maximum channel processing, support of audio formats, DAC specifications, room calibration algorithm... Video score is based on HDR, Dolby Vision and video signal passthrough and upscaling, analog to HDMI upconversion. Connectivity score is defined from all wired and wireless inputs and outputs, internet and bluetooth connections, HEOS, SONOS and others. Multizone score depends on the number of zones with their outputs. Radio score is evaluated form digital radio support and analog tuner with its frequency range, signal to noise ratio, harmonic distortion...

Pros and Cons

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

PROS
Certified 4 Ω Performance πŸ‘
Bi-amp Capability πŸ‘
Many Channel Processing πŸ‘
D.D.S.C. HD Digital πŸ‘
Alpha Processing πŸ‘
Dolby Atmos πŸ‘
Dolby TrueHD πŸ‘
Dolby Digital Plus πŸ‘
Dolby Surround Upmixer πŸ‘
Dolby Digital EX πŸ‘
DTS:X πŸ‘
DTS Neural:X πŸ‘
DTS Virtual:X πŸ‘
DTS-HD Master Audio πŸ‘
DTS-HD High Resolution Audio πŸ‘
DTS 96/24 πŸ‘
DTS Express πŸ‘
DTS-ES πŸ‘
Auro 3D with Auro-Matic Upmixer πŸ‘
High Resolution Music Playback via USB and/or Network πŸ‘
Gapless Playback πŸ‘
DSD via HDMI πŸ‘
DSD via USB πŸ‘
DTS Dialog Control πŸ‘
Dialog Enhancement πŸ‘
Dialog Level Adjustment πŸ‘
Dialog Normalization πŸ‘
Compressed Music Enhancer πŸ‘
Audyssey Dynamic EQ πŸ‘
Audyssey Dynamic Volume πŸ‘
Audyssey LFC πŸ‘
Audyssey Sub EQ HT πŸ‘
Auto Speaker Calibration System with Mic. πŸ‘
Audyssey App Support πŸ‘
Optimized Bass Redirection πŸ‘
Bass Sync πŸ‘
HDR10 πŸ‘
BT.2020 color space πŸ‘
Dolby Vision πŸ‘
HLG πŸ‘
Auto Low Latency Mode Pass-through πŸ‘
3-D Ready πŸ‘
4K or 8K Video Passthrough πŸ‘
4K or 8K Signal Upscaling πŸ‘
Analog To HDMI Upconversion πŸ‘
DLNA 1.5 πŸ‘
HEOS πŸ‘
Works with Amazon Alexa πŸ‘
Ethernet πŸ‘
Wi-Fi πŸ‘
Bluetooth πŸ‘
eARC πŸ‘
New HDCP Version πŸ‘
Many HDMI Inputs πŸ‘
Many HDMI Outputs πŸ‘
USB Input πŸ‘
Many Analog Audio Line Inputs πŸ‘
Phono Input πŸ‘
Composite Video Inputs πŸ‘
Composite Video Outputs πŸ‘
Component Video Inputs πŸ‘
Component Video Outputs πŸ‘
Analog Pre-Outs πŸ‘
Zones πŸ‘
Detachable Power Cord πŸ‘
Analog Tuner πŸ‘
Pandora πŸ‘
Spotify πŸ‘
Tidal πŸ‘
Deezer πŸ‘
Napster πŸ‘
SiriusXM Internet Radio πŸ‘
CONS
No Front Wide Channel Support πŸ‘Ž
No Dolby Atmos Height Virtualization πŸ‘Ž
No IMAX Enhanced πŸ‘Ž
No High-resolution Music Enhancer πŸ‘Ž
No HDR10+ πŸ‘Ž
No Chromecast Built-In πŸ‘Ž
Does Not Work with SONOS πŸ‘Ž
No Multi-Channel Input πŸ‘Ž
Old Bluetooth Version πŸ‘Ž

Major Changes from its predecessor

Here we are comparing Denon AVR-X6400H to its predecessor AVR-X6300H and displaying the major changes.

UPGRADES Denon AVR-X6400H Denon AVR-X6300H
D.D.S.C. HD Digital βœ” 32-bit βœ”
Alpha Processing βœ” AL32 Processing Plus βœ” AL24 Processing Plus
DTS Virtual:X βœ” via firmware update βœ–
Auro 3D with Auro-Matic Upmixer βœ” Built-In βœ”
Bass Sync βœ” βœ–
Enhanced Audio Return Channel (eARC) βœ” βœ–
Wi-Fi Standard IEEE 802.11 a/b/g/n IEEE 802.11 b/g/n

DOWNGRADES Denon AVR-X6400H Denon AVR-X6300H
Digital Radio βœ– βœ” HD Radio

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

Selected Features

Amplifier

Denon AVR-X6400H has 11 channel amplifier and delivers 140 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and also has a stable performance at 4 Ω load.


Video Features

The Receiver has 4K passthrough up to 60p and 4K upscaling up to 60p. It can bypass HDR10, Dolby Vision.


HDR10

High-dynamic-range (HDR) video has greater dynamic range than standard-dynamic-range (SDR) video with brigter whites and deeper blacks. HDR10 was announced on August 27, 2015, by the Consumer Technology Association and uses the wide-gamut Rec. 2020 color space. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 supports up to 1000 nits of brightness and 10-bit color which corresponds to 1024 shades of the primary RGB colors.


Dolby Vision

Dolby Vision is an update to HDR10 by adding dynamic metadata that can be used to more accurately adjust brightness levels up to 10,000 nits maximum brightness on a scene-by-scene or frame-by-frame basis and supports up to 12-bit color depth (4096 shades of RGB) and 8K resolution.


Dolby Atmos and Dolby Surround upmixer

Denon AVR-X6400H supports Dolby Atmos with its Dolby Surround upmixer. It can be configured upto 7.1.4 channels using internal amplifiers.

Dolby Atmos is the first cinematic audio format in which sounds exist as individual entities, called audio objects. In Dolby Atmos, any sound - the helicopter, a car screeching around a corner, a melodic bird call - can exist as an independent audio object, free of channel restrictions. They can be precisely placed and moved anywhere in your room, including overhead, to flow above and around you in three-dimensional space. Through the use of audio objects, overhead sound, and all the richness, clarity, and power of Dolby sound, Dolby Atmos turns your room into an amazing place for entertainment. You'll feel like you're inside the action, in ways you've never experienced before.

Dolby Atmos for the home represents every sound in the original cinema mix as an audio object. Extensions to the Dolby Audioβ„’ codecs, along with an advanced scalable algorithm, allow Dolby Atmos to be delivered via Blu-ray Disc and streaming media. A spatially-coded substream is added to Dolby TrueHD or Dolby Digital Plus. A Dolby Atmos audio/video receiver (AVR) adapts the cinema experience to your home theater from seven speakers to as many as 34 in 24.1.10 configuration, recreating the original artistic concept. The format supports up to 128 simultaneous independent audio objects in a mix for rich, realistic, and breathtaking sound. It recreates the director's original concept through descriptive metadata to provide customized playback for home theater and delivers sounds above you through overhead speakers, special upward-firing Dolby Atmos speakers, or a Dolby Atmos enabled sound bar.

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 and Neural:X upmixer

Denon AVR-X6400H supports DTS:X with its Neural:X upmixer. It can be configured upto 7.1.4 channels using internal amplifiers.

A technique used in DTS:X is similar to the one used in Dolby Atmos. Instead of a fixed number of channels, DTS:X defines object locations from the listener in polar coordinates. An a/v receiver then dynamically renders sound according to the current speaker configuration. The speaker layout employed by DTS:X is the sum of Dolby Atmos and Auro-3D. It has standard 7.1 channel base layer, a 5 channel height layer above the base layer on the front and side walls, and 3 rows of speakers on the ceiling.

DTS Neural:X is a new 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.


Auro-3D with its Auro-Matic upmixer

Denon AVR-X6400H supports Auro-3D and its Auro-Matic upmixer out of the box or after free firmware update. Auro-3D is an immersive 3D audio format developed by the Belgium-based company Auro Technologies. It consists of three layers of sound - surround, height and overhead ceiling. The base horizontal layer uses 5.1 or 7.1 format, the height layer is on top of the base layer and its information is extracted from the standard 5.1 surround PCM carrier. The a/v receiver decoder then extracts this information during playback. In home cinema Auro-3D comes with different listening formats - Auro 9.1, Auro 10.1 with added Top Ceiling channel ("Voice of God"), Auro 11.1 with added Front Height Center channel, and Auro 13.1 with added Left Rear Surround & Right Rear Surround channel. Auro-Matic upmixer takes non Auro-3D sound and upmixes to the current speaker configuration.


D.D.S.C.

Denon AVR-X6400H has 32 bit D.D.S.C (Dynamic Discrete Surround Circuit). A single IC chip is generally used in processing A/D, DSP, and D/A conversions that are vital to sound quality. The D.D.S.C. uses separate components to process the important sections of the A/D, DSP, and D/A conversions and therefore significantly improves signal processing capability and performance. In addition, the approach of developing and incorporating high-quality dedicated elements in the sections that configure the circuitry makes it easier to develop a high-grade, advanced surround circuit compared with the method where all processing is concentrated within a single chip. Denon’s proprietary digital audio technology that had for many years been developed for pure Hi-Fi components is now also alive in each block of the D.D.S.C.


Audyssey

Denon AVR-X6400H comes with Audyssey Dynamic EQ, Audyssey Dynamic Volume, Audyssey LFC and Audyssey Sub EQ HT.

Audyssey Dynamic EQ selects the best possible frequency response and surround volume levels moment-by-moment. This ensures that the bass response, tonal balance and surround impression remain constant despite changes in volume. This is the first technology that carefully combines information from incoming source levels with actual output sound levels in the room, a pre-requisite for delivering a dynamic volume solution.

Your Listening experience can be greatly diminished when there are significant shifts in volume between television programs, commercials and within the program material itself. When this happens you must constantly adjust the volume to maintain your desired listening level. Audyssey Dynamic Volume monitors the volume of program material moment-by-moment and automatically adjusts it, maintaining the desired listening level for all content while optimizing the dynamic range to preserve impact.

While high frequencies are easily stopped by walls low frequencies pass right through. After identifying the frequency range that most readily passes through walls Audyssey developed a technique, called Audyssey LFC (Low Frequency Containment) that reduses the volume at those frequencies and applies psychoacoustic processing to restore the perception of low bass for listeners in the room. The result is no more angry neighbors and no loss of enjoyment for listeners.

Placing two subwoofers in the room can cause problems, they can create standing waves or even cancel each other out resulting in even less bass than a single sub can produce. Audyssey Sub EQ HT allows two subwoofers to be properly used in a home theater system. The process is automated and takes only a few minutes. The result is rich, full bass for everyone in the room.


Room Correction

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

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.


Connectivity

Denon AVR-X6400H can be connected to internet using ethernet cable or built-in wi-fi adapter. It can also connect to bluetooth devices via built-in bluetooth adapter. The Receiver works with Amazon Alexa and supports[y] AirPlay 2. It has 8 HDMI inputs and HDCP 2.2 copy protection. There is a phono input with built-in phono stage for connecting the cartridge output of the turntable directly to the Receiver. There are 11.2 channel analog pre-outs for external amplification.

Front panel has HDMI, USB, Composite and L/R Audio inputs.

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Detailed Specifications

Here we list all the available features and specifications of Denon AVR-X6400H.

BASICS
BrandDenon
ModelAVR-X6400H
TypeA/V Receiver
CountryUSA
Release Year2017
AMPLIFIER
Channels11.2
Front Wide Channel Supportβœ–
Amplifier DesignMonolithic
Discrete Amplificationβœ”
THXβ„’ Certificationβœ–
Continuous 6 Ω Ratedβœ”
Certified 4 Ω Performanceβœ”
Mono Block Power Amplifier Constructionβœ–
Bi-amp Capabilityβœ” assignable
AUDIO
Digital Signal Processing (DSP) Engine4 powerful high speed 4th generation SHARC DSP processors
DACAKM AK4458VN
Maximum Channel Processing11.2
D.D.S.C. HD Digitalβœ” 32-bit
Alpha Processingβœ” AL32 Processing Plus
Air Studios Monitor Certificationβœ–
Dolby Atmosβœ” up to 7.1.4
Dolby Atmos Height Virtualizationβœ–
Dolby TrueHDβœ”
Dolby Digital Plusβœ”
Dolby Surround Upmixerβœ”
Dolby Pro Logicβœ–
Dolby Digital EXβœ”
Surround EXβœ–
DTS:Xβœ” up to 7.1.4
DTS Neural:Xβœ”
DTS Virtual:Xβœ” via firmware update
DTS Neoβœ–
DTS-HD Master Audioβœ”
DTS-HD High Resolution Audioβœ”
DTS 96/24βœ”
DTS Expressβœ”
DTS-ESβœ” Discrete 6.1, Matrix 6.1
IMAX Enhancedβœ–
Auro 3D with Auro-Matic Upmixerβœ” Built-In
PCMβœ” 2-ch/Multi-ch Input
Music Playback via USBMP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD
High Resolution Music Playback via USB and/or Networkβœ” up to 192 kHz
High Resolution Audio Formats via USBApple Lossless, WAV, FLAC, DSD
Multi-Channel Music File Playback via USBβœ–
Gapless Playbackβœ”
DSD via HDMIβœ” 2-ch/Multi-ch Input
DSD via USBβœ” 2-ch Input
DSD to PCM Converterβœ–
USB DACβœ–
Jitter Reductionβœ”
DTS Dialog Controlβœ”
Dialog Enhancementβœ”
Dialog Level Adjustmentβœ”
Dialog Normalizationβœ”
Dialogue Liftβœ–
Compressed Music Enhancerβœ”
High-resolution Music Enhancerβœ–
Audyssey Dynamic EQβœ”
Audyssey Dynamic Volumeβœ”
Audyssey LFCβœ”
Audyssey Sub EQ HTβœ”
Audyssey DSXβœ–
Direct Modeβœ”
Pure Direct Modeβœ”
Independent Dual Subwoofer Outputβœ”
CALIBRATION
Auto Speaker Calibration System with Mic.βœ” Audyssey MultEQ XT32
Audyssey App Supportβœ”
Optimized Bass Redirectionβœ”
Bass Syncβœ”
VIDEO
Video Signal TypeNTSC/PAL
Video Signal Format (Video Covnersion)NTSC/PAL
HDR10βœ”
HDR10+βœ–
BT.2020 color spaceβœ”
Dolby Visionβœ”
Hybrid Log Gamma (HLG)βœ”
Quick Media Switching (QMS)βœ–
Auto Low Latency Mode Pass-throughβœ”
Variable Refresh Rate (VRR)βœ–
Quick Frame Transport (QFT)βœ–
3-D Readyβœ”
Video Signal Passthroughup to 4K 50/60Hz 4:4:4
Video Signal Upscalingβœ” up to 4K 50/60Hz 4:4:4
Analog To HDMI Upconversionβœ” Component, Composite
Component Video Upscalingβœ–
Analog to Analog Video conversionβœ–
Component Video Maximum Resolution1080p
isf Certified Calibration Controlβœ”
CONNECTIVITY
MHL Inputβœ–
DLNA 1.5βœ”
FireConnectβœ–
FlareConnectβœ–
HEOSβœ”
Chromecast Built-Inβœ–
DTS Play-Fiβœ–
Works with Amazon Alexaβœ”
Works with SONOSβœ–
AirPlayβœ” AirPlay 2
Apple Product Connectionβœ” iPod, iPhone and iPad
Remote Appβœ” Denon 2016 AVR Remote App for iOS and Android devices and Kindle Fire
InstaPrevue Input Source Prevueβœ–
Ethernetβœ”
Ethernet Switchβœ–
Wi-Fiβœ”
Bluetoothβœ” SBC
Bluetooth Headphone Transmissionβœ–
HDBaseT Compatibleβœ–
Enhanced ARCβœ”
HDCP Version2.2
HDMI Input8 (1 front)
HDMI Output3 (2 for MAIN, 1 for ZONE2)
USB Input1 (Front) for iPod/iPhone and USB memory
USB DC Out Portβœ–
Analog Audio Line Input7 (1 front)
Analog Audio Line Outputβœ–
Phono Inputβœ”
Optical In2
Optical Outβœ–
Coaxial In/Out2 / βœ–
Composite Video Input5 (1 front)
Composite Video Output1
S-Video Inputβœ–
S-Video Outputβœ–
Component Video Input2
Component Video Output1
PC Inβœ–
Multi-Channel Inputβœ–
Analog Pre-Outs11.2
XLR Inputsβœ–
XLR Pre-outsβœ–
Front A/V InputsHDMI, USB, Composite, L/R Audio
Speaker A/Bβœ” assignable
Headphone Outβœ” 6.3 mm
ZONES
Zones3
Powered Zonesβœ” 2 and 3
Zone 2HDMI, Component, Composite, Pre Out
Zone 3 OutsPre Out
RS-232βœ”
+12V Trigger Output2
Remote (IR) Input/Output1 / 1
MISC
On-Screen Displayβœ” Advanced Graphic User Interface
GUI Languages3
Control4 SDDPβœ”
FL Displayβœ” 2 lines
Remote ControllerRC-1219
Pre-programmed / Learnable / LCD Displayβœ” / βœ– / βœ–
Detachable Power Cordβœ”
Denon Link HDβœ”
Setup Assistantβœ”
Quick Select plus / Quick Selectβœ” / βœ–
RADIO
Analog Tunerβœ” FM/AM
Digital Radioβœ–
Internet Radioβœ” TuneIn
Pandoraβœ”
Spotifyβœ”
Tidalβœ”
Deezerβœ”
Napsterβœ”
SiriusXM Internet Radioβœ”
CONSTRUCTION
Front PanelMetal
Speaker Terminals11
Large Speaker Terminals11
Color-Coded Speaker Terminalsβœ”
Transparent High-Grade Speaker Terminalsβœ”
High Grade Audio Componentsβœ”
Gold plated RCA terminalsβœ”
POWER
Power SupplyAC 120 V, 60 Hz
Power Consumption750 W
No Sound PowerECO On/Off: 65 W/110 W
Standby Power0.1 W
GENERAL
ECO Mode / Hybrid Standby Functionβœ”
Auto Power offβœ”
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")
Weight14.5 kg (31 lbs 15 oz)
Warranty3 Years
SPECS
Power Output (8 Ω, 20 Hz - 20 kHz, 2140 W (0.05% THD)
Power Output (6 Ω, 1 kHz, 2175 W (0.7% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA)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 digital0.008% (1 kHz, at 0 dB)
Analog Distortion0.005% (20 Hz-20 kHz, Direct mode)
Phono Distortion0.03% (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 Impedance1.2 V
Rated Output digital2 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 DeviationΒ±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 HDMI2.8 MHz
DSD Sampling Rates via USB5.6 MHz, 2.8 MHz
Video Input Sensitivity/Output Level and Impedance1 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 Response5 Hz to 60 MHz, 0 dB/-3 dB (Component)
Ethernet Standard100BASE-TX
Wi-Fi StandardIEEE 802.11 a/b/g/n
Wi-Fi Terminal Frequency5 GHz, 2.4 GHz
Bluetooth Version3.0 + EDR
Bluetooth Frequency2.4 GHz
USB TerminalUSB2.0 5V, 1 A
FM Frequency87.5 MHz - 107.9 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)Mono: 2.8 Β΅V (20.2 dBf)
FM Effective Sensitivity1.2 Β΅V (12.8 dBf)
FM S/N RatioMono/Stereo: 70 dB/67 dB
FM Harmonic Distortion (IHF, 1 kHz)Mono/Stereo: 0.7%/1.0%
AM Frequency520 kHz - 1710 kHz
AM Effective Sensitivity18 Β΅V

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

Successor

In 2018 Denon AVR-X6400H was replaced by AVR-X6500H. Let us now have a look at some important changes that the successor brought.


UPGRADES Denon AVR-X6500H Denon AVR-X6400H
IMAX Enhanced βœ” βœ–

DOWNGRADES Denon AVR-X6500H Denon AVR-X6400H
Less Analog Audio Line Inputs 6 7 (1 front)
Less Composite Video Inputs 4 5 (1 front)

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

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