•   Overview
•   Advantage of Denon AVR-X3600H
•   Advantage of Onkyo TX-NR686
•   Common Strengths and Weaknesses
•   Audio Section
•   Video Section
•   Inputs and Outputs
•   Specifications

Here we are comparing Denon AVR-X3600H to Onkyo TX-NR686 to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. The Denon AVR-X3600H has 9 channel and the Onkyo TX-NR686 has 7 channel amplifiers with Denon AVR-X3600H's being more powerful.

Denon AVR-X3600H	Onkyo TX-NR686
Denon AVR-X3600H was introduced in 2019. It is equipped with 9 channel amplifier with 105 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 and DTS:X, passes 4K/60Hz and upscales up to 4K 50/60Hz 4:4:4 video signal.	Onkyo TX-NR686 was introduced in 2018. It is equipped with 7 channel amplifier with 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) power per channel and is capable of 7.1 maximum channel processing. It supports Dolby Atmos and DTS:X, passes 4K/60Hz video signal.
We evaluated the a/v receiver and gave 91 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.	We evaluated the a/v receiver and gave 87 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 89 VIDEO FEATURES 96 AUDIO FEATURES 93 CONNECTIVITY 91 MULTIZONE 84 MISCELLANEOUS 78 RADIO 96 OVERALL 91 Buy on Amazon	AMPLIFIER 89 VIDEO FEATURES 94 AUDIO FEATURES 87 CONNECTIVITY 85 MULTIZONE 77 MISCELLANEOUS 64 RADIO 92 OVERALL 87 Buy on Amazon

This section shows those features and specifications which are the reason to choose Denon AVR-X3600H over Onkyo TX-NR686.

Denon AVR-X3600H has more channels, more power per channel, more channel processing and bigger power supply. It supports IMAX Enhanced, Amazon Alexa, Napster and SiriusXM. It has analog pre-outs. In video department only Denon AVR-X3600H supports HDCP 2.3 copy protection.

	Denon AVR-X3600H	vs	Onkyo TX-NR686
More Channels	9.2	vs	7.2
More Channel Processing	11.2	vs	7.1
Dolby Atmos Height Virtualization		vs
Dolby Digital EX		vs
DTS Virtual:X		vs
IMAX Enhanced		vs
Audyssey Dynamic EQ		vs
Audyssey Dynamic Volume		vs
Audyssey LFC		vs
Audyssey Sub EQ HT		vs
Enhanced Audio Return Channel (eARC)		vs
Newer HDCP Version	2.3	vs	2.2
Auto Low Latency Mode Pass-through		vs
Video Signal Upscaling	up to 4K 50/60Hz 4:4:4	vs
isf Certified Calibration Control		vs
Works with Amazon Alexa		vs
More HDMI Inputs	8 (1 front)	vs	7 (1 front)
More HDMI Outputs	3 (2 for MAIN, 1 for ZONE2)	vs	2 (simultaneous)
More Coaxial Inputs/Outputs	2	vs	1
More Composite Video Inputs	3	vs	2
More Component Video Outputs	1	vs
More Analog Pre-Outs	11.2	vs	0.2
Front A/V Inputs	HDMI, USB	vs	HDMI, Mini-Jack
Speaker A/B	assignable	vs
Zone 2 Outs	HDMI, Pre Out	vs	RCA Line Out
RS-232C Interface		vs
+12V Trigger Output	1	vs	0
Remote (IR) Input/Output	1 / 1	vs	0 / 0
Detachable Power Cord		vs
Napster		vs
SiriusXM Internet Radio		vs
More Speaker Terminals	11	vs	9
More Large Speaker Terminals	11	vs	9
Color-Coded Speaker Terminals		vs
Bigger Power Supply	660 W	vs	580 W
Longer Warranty	3 Years	vs	2 Years
Higher Power Output (8 Ω, 20 Hz - 20 kHz, 2 channel driven, FTC)	105 W (0.08% THD)	vs	100 W (0.08% THD)
Higher Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA)	215 W (10% THD)	vs	210 W (10% THD)
Wider AM Frequency Range	520 kHz - 1710 kHz	vs	530 kHz - 1710 kHz

This section shows those features and specifications which are the reason to choose Onkyo TX-NR686 over Denon AVR-X3600H.

Onkyo TX-NR686 has higher signal to noise ratio. It supports SONOS.

	Denon AVR-X3600H	vs	Onkyo TX-NR686
THX™ Certification		vs	Select™ (previously known as Select2)
Music Playback via USB	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD	vs	FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
High Resolution Audio Formats via USB	Apple Lossless, WAV, FLAC, DSD	vs	FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, Dolby TrueHD
Jitter Reduction		vs	PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio
FlareConnect		vs
Chromecast Built-In		vs
DTS Play-Fi		vs
Works with SONOS		vs	requires firmware update & Sonos Connect
More Analog Audio Line Inputs	5	vs	7 (1 Front)
More GUI Languages	3	vs	7
Higher S/N Ratio (Line, IHF-A)	100 dB	vs	106 dB
Higher S/N Ratio (Phono MM, IHF-A)	74 dB	vs	80 dB

Here we list common strengths and weaknesses of both receivers.

Amplifier

Denon AVR-X3600H	Onkyo TX-NR686
9 channel Amplifier: Denon AVR-X3600H features 9 channel power amplifier. It is rated at 105 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.	7 channel Linear Class A/B Amplifier: Onkyo TX-NR686 features 7 channel power amplifier with Linear Class A/B design. It is rated at 100 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) and is able to drive 4 ohm speakers.

• Dynamic Audio Amplification: Onkyo TX-NR686 features Dynamic Audio Amplification which is Onkyo’s amplification philosophy that focuses on capturing the energy and dynamism contained in the audio signal and reproducing it without loss. Audio signals are not static like a test tone, but rather a countless collection of constantly moving waves. While static measurements such as S/N ratio and Total Harmonic Distortion are important, Onkyo believes that excellent dynamic and transient response is the key to emotionally involving sound. Dynamism - the “life” in music - is achieved when the amp can respond to changes in the signal instantaneously, so notes start and stop naturally and the nuances in attack, decay, sustain, and release are voiced with conviction. Onkyo home theater receivers represent the culmination of almost 70 years’ experience in amplifier design. The unique elements of their amplification system comprise high-current, low-impedance architecture to accurately control large speaker cones while enabling instantaneous response to dynamic changes, and discrete wide-range amplifier circuit topology to eliminate phase shift for clear and accurate audio imaging.

THX Select™ (previously known as Select2) certification

Onkyo TX-NR686 is THX Select™ (previously known as Select2) certified. This means that it is for medium sized rooms, up to 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen.

• THX™ Certification: THX™ Certification offers optimal performance, superior quality and seamless integration. THX works with partners from the ground up, so that certified products deliver professional quality audio-visual experiences right out of the box. They only certify the very best products with uncompromised quality, performance and consistency. They ensure that THX certified devices play well with lower performing devices and components. THX listening modes make the receiver to have one speaker set up for movies, music and games. They are tested for power output, bass management, signal-to-noise ratio and feature THX Loudness Plus, Boundary Gain Compensation, Timbre Matching and RE-EQ.
• Power Output: Power output is tested to ensure the receiver accurately plays source material at THX Reference Level in every input and mode and at every sampling rate for all possible playback combinations selected by the listener.
• Frequency Response: THX has strict requirements for frequency response to ensure that you hear all the details in high-resolution tracks, ensures dialog in movies, and vocals in music are clear while maintaining deep, impactful bass output that doesn’t overpower the listening experience.
• Signal-to-Noise Ratio: THX tests the signal-to-noise ratio to ensure the unit is designed to have low noise performance with very little to no audible hiss from the speakers.
• Bass Management: THX requires an 80Hz crossover point in the setup menu to ensure proper bass management in every THX Certified AVR. This setting confirms that the subwoofer handles low frequencies, freeing up the loudspeakers to handle mids and highs.
• THX Loudness Plus™: THX Loudness Plus™ is a volume control technology featured in THX Certified Dominus, THX Certified Ultra and THX Certified Select AV Receivers, and preamplifiers that automatically adjusts the front-to-back speaker level relationship as you turn the volume down. With THX Loudness Plus, home theater audiences can now experience the rich details of surround sound at any volume level.
• Boundary Gain Compensation: Sitting near a wall may result in increased acoustic levels at the lower frequencies. BGC corrects the way low frequency sound is perceived when seated near a wall. This results in a more accurate bass response.
• Timbre Matching: Your ears hear different tonal qualities in sounds coming from different directions. Timbre Matching restores the frequency balance between your front and surround speakers ensuring seamless and smooth panning between the front to back of the room.
• RE-EQ: Many movie soundtracks are mixed in studios for playback in large cinema auditoriums with an array of speakers. When played on home systems, they may appear abrasive and edgy. Re-EQ establishes a more accurate tonal balance when enjoying movies in your home.

Speaker Configurations

Denon AVR-X3600H's and Onkyo TX-NR686's amplifiers can be assigned for different speaker configurations.

• Dolby Atmos Configurations: The following speaker configurations are supported for Dolby Atmos:
Denon AVR-X3600H: 5.2.2, 5.2.4, 7.2.2 with internal amplifier and 7.2.4 with addition of external 2 channel amplifier.
Onkyo TX-NR686: 5.2.2 with internal amplifier.
• DTS:X Configurations: The following speaker configurations are supported for DTS:X:
Denon AVR-X3600H: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2, 5.2.4, 7.2.2 with internal amplifier and 7.2.4 with addition of external 2 channel amplifier.
Onkyo TX-NR686: The speaker configurations for DTS:X are the same as for Dolby Atmos - 5.2.2 with internal amplifier.
• Configurations without height channels: There are also other speaker configurations available which do not include height channels:
Denon AVR-X3600H: 5.2, 7.2 with internal amplifier.
Onkyo TX-NR686: 5.2, 7.2 with internal amplifier.
• Bi-Amp: You can bi-amp Denon AVR-X3600H's and Onkyo TX-NR686's 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.

Dolby Atmos

Denon AVR-X3600H and Onkyo TX-NR686 support 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: Both models support 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.
• Dolby Atmos Height Virtualization: Denon AVR-X3600H supports Dolby Atmos Height Virtualization which is a digital signal processing solution that leverages Dolby's deep understanding of human audio perception to create the sensation of overhead sound from the listener-level speakers.

DTS:X

Denon AVR-X3600H and Onkyo TX-NR686 support 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: Both models feature DTS Neural:X which 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: Denon AVR-X3600H supports DTS Virtual:X which 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: Both models have 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.

Enhanced Audio Return Channel (eARC)

Denon AVR-X3600H supports 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-X3600H 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.
• Compressed Music Enhancer: Denon AVR-X3600H and Onkyo TX-NR686 feature Compressed Music Enhancer which enhances the quality of the music files with lossy compression.
Advanced Music Optimizer: Compressed music enhancement in Onkyo TX-NR686 is done by Onkyo’s Advanced Music Optimizer. While MP3 or AAC files may sound fine through the headphones of your portable digital player, the limitations of these files can be exposed when played back through a quality home entertainment system. This is because a significant amount of high-frequency bit information is lost during the file-compression process. To counter this, Onkyo has designed the Advanced Music Optimizer to compensate for lost bit information and improve the quality of compressed audio signals. This results in a clearer and more expansive sound. Also included in this technology is a loudness correction feature that further improves the audio character of compressed files.

Room Calibration

Denon AVR-X3600H comes with Audyssey MultEQ XT32 and Onkyo TX-NR686 comes with AccuEQ with AccuReflex™ room correction system.

• 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.
• AccuEQ: First, AccuEQ detects the presence of speakers and evaluates the impedance of each. Next, it pinpoints their distance relative to the main listening position using the mic and sets suitable sound-pressure levels. Then it selects the optimal crossover frequency so that deeper bass rolls smoothly off to the subwoofer. Finally, AccuEQ performs frequency response equalization based on room-acoustic and speaker data collected via microphone. The sound-field is now tailored around the listening position, resulting in a more immersive and realistic in-film experience.

HDMI

Denon AVR-X3600H comes with 8 HDMI inputs. It has 3 outputs - 2 for MAIN and 1 for ZONE2.

Onkyo TX-NR686 comes with 7 HDMI inputs. It has 2 outputs which work parallelly and output the same signal.

• 4K/60Hz Passthrough: On both receivers all inputs pass up to 4K 50/60Hz 4:4:4 video signal.
• 4K Upscaling on Denon AVR-X3600H: It can upscale up to 4K 50/60Hz 4:4:4 from HDMI and analog sources.
• Analog To HDMI Upconversion: Both receivers support analog to HDMI Upconversion, so you can input your analog video sources and output them digitally 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% (available on both models).
• HDCP Copy Protection: Denon AVR-X3600H is HDCP 2.3 and Onkyo TX-NR686 is HDCP 2.2 compliant which is a requirement for 4K/HDR copy-protected content transmission.
• 3D Ready: Both receivers are able to pass 3D video through HDMI.

HDR (High Dynamic Range)

Both receivers support 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.

IMAX Enhanced

Denon AVR-X3600H is IMAX Enhanced certified. To qualify for IMAX Enhanced certification, 4K HDR televisions, projectors, sound bars, a/v receivers, loudspeakers, powered subwoofers and other premium home entertainment devices must meet carefully prescribed performance requirements established by IMAX, DTS and Hollywood's leading experts.

• What makes an IMAX Enhanced A/V receiver different from an A/V receiver with DTS:X technology? DTS:X technology is commonly found in most multi-channel A/V receivers on the market today. All IMAX Enhanced A/V receivers include DTS:X technology and deliver additional features, such as auto-sensing of IMAX Enhanced content, via IMAX Mode. IMAX Mode indicates that your A/V receiver supports fully immersive IMAX signature sound.
• IMAX Enhanced Content: IMAX Enhanced studio partners have announced IMAX Enhanced versions of movies that exclusively feature IMAX's signature picture, sound and scale.
• Picture: Stunning, ultra-vivid 4K HDR picture that utilizes the newest, proprietary Digital Media Remastering technology (DMR) developed by IMAX. DMR accurately reduces noise and grain under the filmmaker’s guidance to best optimize the content for a much higher-quality, higher-brightness display. Without this technology, high-dynamic range content can actually look worse than what was originally seen and intended by the filmmaker.
• Sound: IMAX and DTS have partnered with award-winning Hollywood sound mixers leveraging DTS:X codec technology integrated in home audio equipment and select televisions to deliver an IMAX signature sound experience with deeper bass and more dynamic range.
• Scale: Select IMAX Enhanced titles that were shot with IMAX-certified cameras or specially formatted for IMAX theatres feature its exclusive expanded aspect ratio, enabling viewers to see the full scale and scope of the picture on 4K HDR TVs.
• Streaming Services: IMAX Enhanced is now available on the world’s biggest streaming services, including Disney+, BRAVIA CORE, Tencent, iQiyi and more.

Gaming Features

Denon AVR-X3600H 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.

Audio

• Phono Input: There is an MM phono input on Denon AVR-X3600H and Onkyo TX-NR686 with built-in phono stage for connecting the moving magnet cartridge output of the turntable directly to the receiver.
• Analog Pre-Outs: Denon AVR-X3600H has 11.2 preamplifier outputs which allows you to connect the 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 receiver to power the rest. Also, Denon AVR-X3600H has 11 channel processing but has only 9 channel amplifier, so it needs external amplifier connected to the analog pre-outs in order to reach its maximum speaker configuration.
• Analog Line Inputs: There are 5 pair of line inputs on Denon AVR-X3600H and 7 pair of line inputs on Onkyo TX-NR686 for connecting sources with analog outputs.
• Digital Inputs: 2 optical inputs and 2 coaxial inputs are available on Denon AVR-X3600H and 2 optical inputs and 1 coaxial input are available on Onkyo TX-NR686 for digital audio connections.
• Headphone Output: There is a 6.3 mm (1/4") headphone output jack on the front panel of each receiver.

Video

• HDMI:
Denon AVR-X3600H
Inputs: 8 (1 front)   Outputs: 3 (2 for MAIN, 1 for ZONE2)
8K Inputs: 0.
Onkyo TX-NR686
Inputs: 7 (1 front)   Outputs: 2 (simultaneous)
8K Inputs: 0.
• Composite Video: Connect you VCR, Laserdisc player and other old video equipment with composite video cables.
Denon AVR-X3600H
Inputs: 3   Outputs: 0.
Onkyo TX-NR686
Inputs: 2   Outputs: 0.
• 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. resolution on Component video connectors.
• Onkyo TX-NR686 supports up to 480i/576i resolution on Component video connectors.
Denon AVR-X3600H
Inputs: 2   Outputs: 1.
Onkyo TX-NR686
Inputs: 2   Outputs: 0.

Front A/V Inputs

• Denon AVR-X3600H: HDMI, USB
• Onkyo TX-NR686: HDMI, Mini-Jack

And in the end let us list all the available specifications of the receivers side-by-side.

BASICS	Denon AVR-X3600H	Onkyo TX-NR686
Brand	Denon	Onkyo
Model	AVR-X3600H	TX-NR686
Type	A/V Receiver	A/V Receiver
Country	USA	North America
Release Year	2019	2018

AMPLIFIER	Denon AVR-X3600H	Onkyo TX-NR686
Channels	9.2	7.2
Front Wide Channel Support
Amplifier		Linear Class A/B
Discrete Amplification
Dynamic Audio Amplification
Non-Phase Shift Amplifier
VLSC (Vector Linear Shaping Circuitry)		Front L/R channels
Optimum Gain Volume Circuitry
THX™ Certification		Select™ (previously known as Select2)
Continuous 6 Ω Rated
Certified 4 Ω Performance
Discrete Output Stage Circuitry
Mono Block Power Amplifier Construction
Independent Block Construction (Amp/Preprocessor)
Bi-amp Capability	(assignable)
BTL (Bridged Transless or Bridging)

AUDIO	Denon AVR-X3600H	Onkyo TX-NR686
Digital Signal Processing (DSP) Engine	Four 300 MHz DSP cores	32-bit Digital Signal Processing Engines
DAC	AKM	AKM AK4458
DAC Specs		384 kHz/32 Bit
Maximum Channel Processing	11.2	7.1
D.D.S.C. HD Digital
Alpha Processing
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
THX Listening Modes
Surround EX
DTS:X	up to 7.1.4
DTS Neural:X
DTS Virtual:X
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
PCM	2-ch/Multi-ch Input	2-ch/Multi-ch Input
Music Playback via USB	MP3, WMA, AAC, Apple Lossless, WAV, FLAC, DSD	FLAC, WAV, Apple Lossless, WMA, MP3, DSD, AIFF, AAC, Dolby TrueHD
High Resolution Music Playback via USB and/or Network	up to 192 kHz	up to 192 kHz
High Resolution Audio Formats via USB	Apple Lossless, WAV, FLAC, DSD	FLAC, WAV, Apple Lossless, DSD, AIFF, AAC, 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 Dialog Control
Dialog Enhancement
Dialog Level Adjustment
Dialog Normalization
Dialogue Lift
Tone Control		Front L/R Channels
Compressed Music Enhancer		Advanced Music Optimizer (bluetooth included)
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
Direct Mode
Pure Audio Mode
Pure Direct Analog Path Mode
Pure Direct Mode
Virtual Speakers		T-D (Theater-Dimensional)
Independent Subwoofer Outputs

CALIBRATION	Denon AVR-X3600H	Onkyo TX-NR686
Auto Speaker Calibration System with Mic.	Audyssey MultEQ XT32	AccuEQ with AccuReflex™
Audyssey App Support
Optimized Bass Redirection
Bass Sync

VIDEO	Denon AVR-X3600H	Onkyo TX-NR686
Enhanced ARC
HDCP Version	2.3	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	up to 4K/60p (RGB/YCbCr4:4:4)
Video Signal Upscaling	up to 4K 50/60Hz 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
isf Certified Calibration Control

CONNECTIVITY	Denon AVR-X3600H	Onkyo TX-NR686
MHL Input
DLNA 1.5
FireConnect
FlareConnect
HEOS
Chromecast Built-In
DTS Play-Fi
Works with Amazon Alexa
Google assistant
Apple Siri
Works with SONOS		requires firmware update & Sonos Connect
AirPlay	AirPlay 2	AirPlay 2 after firmware update
Apple Product Connection	iPod, iPhone and iPad	iPod, iPhone and iPad
Remote App	Denon 2016 AVR Remote App for iOS and Android devices and Kindle Fire	Onkyo Remote App for iPod touch/iPhone and Android-Powered Devices
InstaPrevue Input Source Prevue
Ethernet
Ethernet Switch
Wi-Fi
Bluetooth	SBC	SBC, AAC
Bluetooth Headphone Transmission
HDBaseT Compatible
HDMI Inputs	8 (1 front)	7 (1 front)
HDMI Outputs	3 (2 for MAIN, 1 for ZONE2)	2 (simultaneous)
8K Inputs
USB Input	1 Front for USB memory	1 (Rear)
USB DC Out Port
Analog Audio Line Input	5	7 (1 Front)
Analog Audio Line Output
Phono Input
Optical Inputs	2	2
Optical Outputs
Coaxial Inputs	2	1
Composite Video Input	3	2
Composite Video Output
S-Video Input
S-Video Output
Component Video Input	2	2
Component Video Output	1
PC In
Multi-Channel Input
Analog Pre-Outs	11.2	0.2
XLR Inputs
XLR Pre-outs
Front A/V Inputs	HDMI, USB	HDMI, Mini-Jack
Speaker A/B	assignable
Headphone Out	6.3 mm (1/4")	6.3 mm (1/4")

ZONES	Denon AVR-X3600H	Onkyo TX-NR686
Zones	2	2
Powered Zones	2	2
Zone 2 Outs	HDMI, Pre Out	RCA Line Out
Whole House Mode
RS-232C Interface
+12V Trigger Output	1	0
Remote (IR) Input/Output	1 / 1	0 / 0

MISC	Denon AVR-X3600H	Onkyo TX-NR686
On-Screen Display	Advanced Graphic User Interface	Graphical Overlaid On-Screen Display (OSD) via HDMI with Quick Set-Up
GUI Languages	3	7
Web Browser Control
IP Control for CI
Control4 SDDP
Display	1 line
Remote Controller	RC-1228
Pre-programmed / Learnable / LCD Display	/ /
Detachable Power Cord
uport
ONKYO-RI System Control
RIHD (Remote Interactive Over HDMI)
Smart Grid-Ready
Denon Link HD
Setup Assistant
Quick Select plus / Quick Select	/

RADIO	Denon AVR-X3600H	Onkyo TX-NR686
Analog Tuner	FM/AM	FM/AM
Presets		40
Digital Radio
Internet Radio	TuneIn	TuneIn
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM Internet Radio

CONSTRUCTION	Denon AVR-X3600H	Onkyo TX-NR686
Front Panel	not Metal
Solid Aluminum Front
Speaker Terminals	11	9
Large Speaker Terminals	11	9
Color-Coded Speaker Terminals
Transparent High-Grade Speaker Terminals
18mm Pitch High Grade Pre-outs
19mm-Pitch Audio Inputs
High Grade Audio Components
Gold plated RCA terminals

POWER	Denon AVR-X3600H	Onkyo TX-NR686
Power Supply	AC 120 V, 60 Hz	AC 120 V, 60 Hz
Independent Power Supply
H.C.P.S. (High Current Power Supply)		Customized Transformer
Toroidal Transformer
Power Consumption	660 W	580 W
No Sound Power	ECO On/Off: 45 W/80 W	60 W
Standby Power	0.1 W	0.15 W

GENERAL	Denon AVR-X3600H	Onkyo TX-NR686
ECO Mode / Hybrid Standby Function
Auto Power off
Dimensions (W x H x D)	434 mm x 167 mm x 391 mm (with antenna: 434 mm x 237 mm x 391 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")	435 mm x 173.5 mm x 379.5 mm 17-1/8" x 6-13/16" x 14-15/16"
Dimensions of Package (W x H x D)	519 mm x 242 mm x 478 mm
Weight	12.1 kg (26 lbs 11 oz)	10.0 kg (22.0 lbs)
Weight of Package	14.6 kg
Warranty	3 Years	2 Years

SPECS	Denon AVR-X3600H	Onkyo TX-NR686
Power Output (8 Ω, 20 Hz - 20 kHz, 2	105 W (0.08% THD)	100 W (0.08% THD)
Power Output (6 Ω, 1 kHz, 2	135 W (0.7% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA)	215 W (10% THD)	210 W (10% THD)
Rated Power Output (6 Ω, 1 kHz, 1 channel driven, IEC)	180 W (1% THD)
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)
THD digital	0.008% (1 kHz, at 0 dB)
Analog Distortion	0.008% (20 Hz-20 kHz, Direct mode)
Phono Distortion	0.03% (1 kHz, 3 V)
Input Sensitivity and Impedance (Line)	200 mV/47 kΩ	200 mV/47 kΩ (1 kHz, 100 W/8 Ω)
Input Sensitivity and Impedance (Phono MM)		3.5 mV/47 kΩ
Rated Lineout Level and Impedance	1.2 V
Rated Output digital	2 V (at 0 dB playback)
Rated Headphone Power Output		80 mW (32 Ω, 1 kHz, 10% THD)
Phono Overload		70 mV (MM, 1 kHz 0.5%)
S/N Ratio (Line, IHF-A)	100 dB	106 dB
S/N Ratio (Phono MM, IHF-A)	74 dB	80 dB
S/N Ratio (digital)	102 dB
Dynamic Range (digital)	100 dB
Phono RIAA Deviation	±1 dB (20-20 kHz)
Frequency Response (Analog In)	+1/-3 dB (10 Hz to 100 kHz, Direct mode)	10 Hz - 100 kHz/+1 dB, -3 dB (Direct)
DSD Sampling Rates via HDMI	2.8 MHz	2.8 MHz
DSD Sampling Rates via USB	5.6 MHz, 2.8 MHz	2.8 MHz, 5.6 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 Frequency Response	5 Hz to 60 MHz, 0 dB/-3 dB (Component)
Ethernet Standard	100BASE-TX	10BASE-T/100BASE-TX
Wi-Fi Standard	IEEE 802.11 a/b/g/n	IEEE 802.11 a/b/g/n
Wi-Fi Terminal Frequency	5 GHz, 2.4 GHz	5 GHz, 2.4 GHz
Bluetooth Version	4․1	4․1 + LE
Bluetooth Frequency	2.4 GHz	2.4 GHz
USB Terminal	USB2.0 5V, 1 A	Ver. 2.0, 5 V, 1 A
FM Frequency	87.5 MHz - 107.9 MHz	87.5 MHz - 107.9 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)	Mono: 2.8 µV (20.2 dBf)	Mono: 1.56 µV (15.0 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	530 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