Denon AVR-X6400H (USA version)

•   Overview
•   Pros and Cons
•   Predecessor
•   Audio Section
•   Video Section
•   Multi-zone Playback
•   Inputs and Outputs
•   Specifications
•   Successor

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.

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

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

UPGRADES	Denon AVR-X6400H	vs	Denon AVR-X6300H
Bi-amp capability	Full (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	520 kHz - 1710 kHz	vs	530 kHz - 1710 kHz

DOWNGRADES	Denon AVR-X6400H	vs	Denon AVR-X6300H
Mono Block Power Amplifier Construction		vs
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
Digital Radio		vs	HD Radio
Lower FM S/N Ratio	Mono/Stereo: 70 dB/67 dB	vs	Mono/Stereo/HD: 78 dB/68 dB/85 dB
Higher FM Harmonic Distortion (IHF, 1 kHz)	Mono/Stereo: 0.7%/1.0%	vs	Mono/Stereo/HD: 0.1%/0.2%/0.02%

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

11 channel Monolithic Amplifier

Denon AVR-X6400H features 11 channel power amplifier with Monolithic design. It is rated at 140 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

Speaker Configurations

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.
• Bi-Amp: You can bi-amp front left and right speakers. 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.
Full Bi-Amp: Denon AVR-X6400H also features a Full Bi-Amp mode which allows you to bi-amp front, center and surround speakers in 5.1 layout.

Dolby Atmos

Denon AVR-X6400H supports Dolby Atmos. It is a cinematic audio format in which sounds exist as individual entities, called audio objects. In Dolby Atmos, any sound 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. 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.

• Dolby 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. 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: DTS 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.
• DTS Virtual:X: DTS 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. 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: Auro-Matic upmixer takes non Auro-3D sound and upmixes to the current speaker configuration.

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.

Sound Processing

• Audyssey: Denon AVR-X6400H comes with Audyssey Dynamic EQ, Dynamic Volume, LFC and Sub EQ HT.
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.
Dynamic Volume: 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.
LFC (Low Frequency Containment): 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.
Sub EQ HT: 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.
• 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.
• Advanced AL32 Processing: Denon AVR-X6400H has Advanced AL32 Processing which uses a unique data interpolation algorithm to achieve high-bit, high-sampling output performance. The volume of information has been dramatically improved without any loss in the original data. The clean playback sound free of interference makes it possible to enjoy delicate details, accurate localization, and rich expression in the lower range. Advanced AL32 Processing has three functions: 1. High-bit up-conversion (Adaptive Line Pattern Harmonized Algorithm), 2. Advanced ALPHA Processing and 3. Adaptive digital filter (Automatic Low-Pass filter Harmonic Adjustment).

Room Calibration

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.

HDMI

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. 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.

• HDR10: HDR10 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 10-bit color which corresponds to 1024 shades of the primary RGB colors. It is technically limited to a maximum of 10,000 nits peak brightness, however common HDR10 contents are mastered with peak brightness from 1,000 to 4,000 nits.
• Dolby Vision: Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. It covers content creation, distribution, and playback. Like HDR10+, it includes dynamic metadata that are used to adjust and optimize each frame of the HDR video to the consumer display's capabilities in a way specified by the content creator. Dolby Vision allows for a maximum resolution of 8K up to 12-bit color depth, maximum peak brightness of 10,000 nits and a color gamut up to Rec. 2020. It uses Dolby's proprietary dynamic metadata defined in SMPTE ST 2094-10.
• Hybrid Log-Gamma (HLG): The Hybrid Log-Gamma (HLG) is a transfer function developed mainly for HDR live video feed and over-the-air broadcasts. It is an HDR format that uses BT.2020 color primaries and a bitdepth of 10-bit. It is backward compatible with the transfer function of SDR and is designed to be better-suited for television broadcasting, where the metadata required for other HDR formats is not backward compatible with non-HDR displays. HLG defines a non-linear optical-electro transfer function, in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a logarithmic curve.

andh3>Gaming Features

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

• Auto Low Latency Mode (ALLM): Auto Low Latency Mode enables the ideal latency setting to automatically be set allowing for smooth, lag-free and uninterrupted viewing and interactivity. When the receiver detects a gaming signal it will enter ALLM. The signal will also be sent to the TV causing it to automatically switch to a low-latency, low-lag mode for gaming. Some functions will not be available on the receiver and TV during ALLM.

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

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

BASICS
Brand	Denon
Model	AVR-X6400H
Type	A/V Receiver
Country	USA
Release Year	2017

AMPLIFIER
Channels	11.2
Front Wide Channel Support
Amplifier	Monolithic
Discrete Amplification
THX™ Certification
Continuous 6 Ω Rated
Certified 4 Ω Performance
Mono Block Power Amplifier Construction
Bi-amp Capability	Full (assignable)

AUDIO
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
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
Multi-Channel Music File Playback via USB
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 Dialog 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
Enhanced ARC
HDCP Version	2.2
HDR10
HDR10+
Dynamic HDR
Dolby Vision
HLG (Hybrid Log Gamma)
BT.2020 color space
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
MHL Input
DLNA 1.5
FireConnect
FlareConnect
HEOS
Chromecast Built-In
DTS Play-Fi
Works with Amazon Alexa
Works with SONOS
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
Ethernet
Ethernet Switch
Wi-Fi
Bluetooth	SBC
Bluetooth Headphone Transmission
HDBaseT Compatible
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
Analog Audio Line Input	7 (1 front)
Analog Audio Line Output
Phono Input
Optical Inputs	2
Optical Outputs
Coaxial Inputs	2
Composite Video Input	5 (1 front)
Composite Video Output	1
S-Video Input
S-Video Output
Component Video Input	2
Component Video Output	1
PC In
Multi-Channel Input
Analog Pre-Outs	11.2
XLR Inputs
XLR Pre-outs
Front A/V Inputs	HDMI, USB, Composite, L/R Audio
Speaker A/B	assignable
Headphone Out	6.3 mm (1/4")

ZONES
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

MISC
On-Screen Display	Advanced Graphic User Interface
GUI Languages	3
Control4 SDDP
Display	2 lines
Remote Controller	RC-1219
Pre-programmed / Learnable / LCD Display	/ /
Detachable Power Cord
Denon Link HD
Setup Assistant
Quick Select plus / Quick Select	/

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

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 120 V, 60 Hz
Power Consumption	750 W
No Sound Power	ECO On/Off: 65 W/110 W
Standby Power	0.1 W

GENERAL
ECO Mode / Hybrid Standby Function
Auto Power off
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)
Warranty	3 Years

SPECS
Power Output (8 Ω, 20 Hz - 20 kHz, 2	140 W (0.05% THD)
Power Output (6 Ω, 1 kHz, 2	175 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 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 - 107.9 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	520 kHz - 1710 kHz
AM Effective Sensitivity	18 µV

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

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	vs	Denon AVR-X6400H
IMAX Enhanced		vs

DOWNGRADES	Denon AVR-X6500H	vs	Denon AVR-X6400H
Less Analog Audio Line Inputs	6	vs	7 (1 front)
Less Composite Video Inputs	4	vs	5 (1 front)
Front A/V Inputs	HDMI, USB	vs	HDMI, USB, Composite, L/R Audio

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