Denon AVR-S660H vs Onkyo TX-NR686

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Votes 1 1
Rating 5 5

AVR-S660H vs TX-NR686 comparison chart

Denon AVR-S660H vs Onkyo TX-NR686 review

Denon AVR-S660H
vs
Onkyo TX-NR686

Let's make the Denon AVR-S660H versus Onkyo TX-NR686 comparison. According to the results of our review, Denon AVR-S660H received 6.7 points out of 10 possible, and Onkyo TX-NR686 was rated 7.2 points. The release date of AVR-S660H is 2021, and TX-NR686 is 2018. After comparison, it will become clear that among these two devices, the TX-NR686 is more suitable for the role of the heart of home theater system.

Main advantages Denon AVR-S660H over Onkyo TX-NR686

  • Include HDMI eARC function.
  • 8K/60Hz signal pass-through is available.

Main advantages Onkyo TX-NR686 over Denon AVR-S660H

  • More channels, namely 7, makes this receiver more profitable than its 5-channel competitor.
  • Thanks to 2 multi-room zones support, TX-NR686 bypasses its competitor without multizone support.

Amplifiers

For the built-in amplifier, the devices received different marks - 6 and 7, respectively, on a 10-point scale.

AVR-S660H
6
TX-NR686
7

The number of channels is equal to the number of possible connected speakers. The Denon AVR-S660H supports 5.2-channels sound, but Onkyo TX-NR686 supports a 7.2-channels configuration.

RMS stands for the actual power of the receiver. The higher this value, the louder the sound can be produced. The differences between the models in terms of RMS power are significant - for the TX-NR686 this value is 165/6 W/Ohm, and for the AVR-S660H it is 100/6 W/Ohm.

AVR-S660H TX-NR686
Channels5.27.2
Stereo power (RMS), W/Ohm75/8, 100/6165/6
Output impedance, Ohm8, 66
Frequency response10Hz-100KHz10Hz-100KHz
THD in stereo, %0.080.08

Audio features

After reviewing the audio features of each model, we can rate the AVR-S660H 6 out of 10, and the TX-NR686 - 9.

AVR-S660H
6
TX-NR686
9

Bi-amping is the amplification of one speaker with two amplifiers. This amplification method has a positive effect on sound quality. Bi-amping is possible on the TX-NR686.

Pure Direct mode feeds sound directly to the amplifier and bypasses any DSP processing. Only Onkyo TX-NR686 has Pure Direct mode.

Most receivers now come with a microphone included. It is with the help of this microphone that the auto-calibration system functions, which adjusts the sound of the receiver to the room.

AVR-S660H TX-NR686
Digital to analog converter (DAC)192 KHz/32-bitVLSC 384 KHz/32-bit
Bi-amping
Pure direct (straight)
Auto speaker calibrationAudyssey MultEQAccuEQ
Speaker A/B switching
Other audio featuresAudyssey Dynamic Volume, Audyssey Dynamic EQ, Hi-Res audioAdvanced Music Optimizer, Theater-Dimensional, Hi-Res audio

Connectivity

The connectivity of competitors in our comparison is markedly different, Denon AVR-S660H scored 7, and Onkyo TX-NR686 scored 8 out of 10.

AVR-S660H
7
TX-NR686
8

Bluetooth connection is now one of the main communication protocols for the receiver's control or even music broadcasting.

AVR-S660H TX-NR686
Wi-Fi2.4/5GHz2.4/5GHz
USB1 (USB 2.0)1 (USB 2.0)
Bluetooth
Ethernet (RJ45)11
DLNA
MHL

Streaming services

Now music streaming services are gaining more and more popularity. They allow users to listen to millions of songs by subscription.

AVR-S660H TX-NR686
Apple Music (AirPlay)AirPlay, AirPlay 2AirPlay
Amazon Music
Spotify
Other streaming servicesDeezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloudDeezer, TIDAL, TuneIn Radio

Extensive connections

The presence of many connectors makes the receiver more versatile. But there are also narrowly targeted models, the number of connectors which are limited to a certain area of use. And when choosing their own receiver, users need to consider exactly your goals for using the receiver. For extensive connection, Denon AVR-S660H got 7 points, but Onkyo TX-NR686 received 8 points.

AVR-S660H
7
TX-NR686
8

Denon AVR-S660H is equipped with 6/1 HDMI inputs and outputs, and Onkyo TX-NR686 has 7/2 HDMI inputs and outputs.

HDMI eARC is the next step in the development of audio return channel technology, which works in conjunction with HDMI 2.1. Using eARC provides the highest sound quality for home audio systems. HDMI eARC is available only on Denon AVR-S660H.

The HDCP encryption protocol is now mandatory for most media devices. This security technology encrypts digital signals from one product to another. HDCP content-encryption protocol is present on Denon AVR-S660H in the HDCP 2.3 version, and Onkyo TX-NR686 has the HDCP 2.2 version.

AVR-S660H TX-NR686
HDMI input/output6/17/2
HDMI ARC (Audio Return Channel)
HDMI eARC (Enhanced Audio Return Channel)
HDMI CEC
Digital content protection (HDCP)HDCP 2.3HDCP 2.2
Subwoofer output (LFE)22
Headphone output1 x 6.31 x 6.3
Optical digital input22
Coaxial digital input11
Composite input22
Component input/output02/0
Phono (MM) input
Front panel connectorsUSB, phones, setup micHDMI, phones, setup mic
Multi channel preamp output

Video features

The AV receiver is the heart of the home theater. And in this case, support for all current video formats ensures the best user experience, so it is very important to consider this when choosing a device. Video features of the AVR-S660H were rated 8 out of 10 against the 7 for the TX-NR686.

AVR-S660H
8
TX-NR686
7

With the 4K pass-through feature, the AV receiver sends "native" 4K signals to a 4K TV from a video source without any processing. The AVR-S660H works with the 4K/120Hz video, and the TX-NR686 has the 4K/60Hz.

The AV receiver passes "native" 8K signals from a video source to 8K TV without any encoding, with the 8k pass-through features. The 8K path-through is available only on Denon AVR-S660H.

Most of the AV receivers have a video scaling function, it is the process of reformatting the video signal to a higher resolution without losing the quality of the image. Upscaling the video signal resolution is possible only with Denon AVR-S660H.

AVR-S660H TX-NR686
HDR (High Dynamic Range)HDR10+HDR10
4K signal pass-through4K/120Hz4K/60Hz
8K signal pass-through8K/60Hz
HDMI signal pass-through
3D signal pass-through
HDMI pass-through in standby mode
Video conversion
Analog to HDMI scaling
HDMI to HDMI scaling
Dolby Vision
Other video featuresDynamic HDR, HLG, BT.2020DeepColor, x.v.Color

Additional features

In terms of evaluating additional features, the AVR-S660H got 10 points, but the TX-NR686 has 7.

AVR-S660H
10
TX-NR686
7

Only the Denon AVR-S660H has the ECO mode.

AVR-S660H TX-NR686
Voice controlAmazon Alexa, Google Assistant, Siri, Josh.AIGoogle Assistant
App controliPhone, iPad, iPod, AndroidiPhone, iPod, Android
Displaycolour OSDfluorescent
TunerAM, FMAM, FM
Sleep timer
Auto power off
ECO mode
Graphical user interface (GUI)
Setup assistant
Firmware updatenetwork, USBnetwork, USB
Other additional featuresWeb Control, App ControlIP Control

Multi-room

As the center of a home media system, each multichannel receiver has an additional set of terminals for connecting the second set of speakers to create additional audio space in Zone 2 or even Zone 3 where audio can have the separate source.

AVR-S660H TX-NR686
Multi-room zoneshas not2
Zone audio outputhas notspeaker, preout
Zone HDMI outputhas not
Multi-room controlHEOS App, Denon 2016 AVR RemoteOnkyo Controller app, FlareConnect
RS-23200
Remote control input/output (IR)0/00/0
DC trigger output (12V)00

Multichannel surround

Denon AVR-S660H got 8 points for the multichannel surround sound and Onkyo TX-NR686 got 7.

AVR-S660H
8
TX-NR686
7

AVR-S660H TX-NR686
Dolby Atmos
Dolby TrueHD
Dolby Surround
Dolby (other)Dolby Atmos Height VirtualizationDolby Digital Plus
DTS:X
DTS HD Master
DTS Virtual:X
DTS Neural:X
DTS (other)DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESSDTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS
Auro-3D
IMAX Enhanced
Multichannel stereo
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