Being able to compare Denon AVR-X4500H and Denon AVR-S660H gave us an insight into what of them would be better for home theater configuration. According to the results of our review, Denon AVR-X4500H received 9.4 points out of 10 possible, and Denon AVR-S660H was rated 6.7 points. The release date of AVR-X4500H is 2018, and AVR-S660H is 2021. AVR-X4500H is more performable in terms of audio broadcast than the AVR-S660H.
For the built-in amplifier, the devices received different marks - 9 and 6, respectively, on a 10-point scale.
The number of channels is equal to the number of possible connected speakers. The Denon AVR-X4500H supports 9.2-channels sound, but Denon AVR-S660H supports a 5.2-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 AVR-X4500H this value is 125/8 W/Ohm, and for the AVR-S660H it is 75/8 W/Ohm.
|Stereo power (RMS), W/Ohm||125/8, 165/6||75/8, 100/6|
|Output impedance, Ohm||8, 6||8, 6|
|THD in stereo, %||0.05||0.08|
After reviewing the audio features of each model, we can rate the AVR-X4500H 9 out of 10, and the AVR-S660H - 6.
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 only on the AVR-X4500H.
Pure Direct mode feeds sound directly to the amplifier and bypasses any DSP processing. Only Denon AVR-X4500H 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.
Speaker A/B switching allows you to change between the main and sub speaker set. Denon AVR-X4500H can work with the main and additional set of speakers - and switch between them.
|Digital to analog converter (DAC)||AK4458 384 KHz/32-bit||192 KHz/32-bit|
|Pure direct (straight)||✔||✖|
|Auto speaker calibration||Audyssey MultEQ XT32||Audyssey MultEQ|
|Speaker A/B switching||✔||✖|
|Other audio features||Audyssey Dynamic Volume, Audyssey Dynamic EQ, Audyssey LFC, Compressed Audio Restorer||Audyssey Dynamic Volume, Audyssey Dynamic EQ, Hi-Res audio|
The connectivity of competitors in our comparison is markedly different, Denon AVR-X4500H scored 8, and Denon AVR-S660H scored 7 out of 10.
Bluetooth connection is now one of the main communication protocols for the receiver's control or even music broadcasting.
|USB||1 (USB 2.0)||1 (USB 2.0)|
Now music streaming services are gaining more and more popularity. They allow users to listen to millions of songs by subscription.
|Apple Music (AirPlay)||AirPlay, AirPlay 2||AirPlay, AirPlay 2|
|Other streaming services||Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud||Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud|
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-X4500H got 10 points, but Denon AVR-S660H received 7 points.
Denon AVR-X4500H is equipped with 8/3 HDMI inputs and outputs, and Denon AVR-S660H has 6/1 HDMI inputs and outputs.
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-X4500H in the HDCP 2.2 version, and Denon AVR-S660H has the HDCP 2.3 version.
|HDMI ARC (Audio Return Channel)||✔||✔|
|HDMI eARC (Enhanced Audio Return Channel)||✔||✔|
|Digital content protection (HDCP)||HDCP 2.2||HDCP 2.3|
|Subwoofer output (LFE)||2||2|
|Headphone output||1 x 6.3||1 x 6.3|
|Optical digital input||2||2|
|Coaxial digital input||2||1|
|Phono (MM) input||✔||✔|
|Front panel connectors||USB, HDMI, phones, setup mic||USB, phones, setup mic|
|Multi channel preamp output||✔||✔|
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-X4500H were rated 10 out of 10 against the 8 for the AVR-S660H.
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-X4500H works with the 4K/60Hz video, and the AVR-S660H has the 4K/120Hz.
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 on Denon AVR-S660H.
|HDR (High Dynamic Range)||HDR10||HDR10+|
|4K signal pass-through||4K/60Hz||4K/120Hz|
|8K signal pass-through||✖||8K/60Hz|
|HDMI signal pass-through||✔||✔|
|3D signal pass-through||✔||✔|
|HDMI pass-through in standby mode||✔||✔|
|Video conversion||analog to HDMI||✖|
|Analog to HDMI scaling||✔||✖|
|HDMI to HDMI scaling||✔||✔|
|Other video features||HLG, BT.2020||Dynamic HDR, HLG, BT.2020|
In terms of evaluating additional features, both receivers received a score of 10 out of 10.
|Voice control||Amazon Alexa||Amazon Alexa, Google Assistant, Siri, Josh.AI|
|App control||iPhone, iPad, iPod, Android, Amazon Kindle||iPhone, iPad, iPod, Android|
|Display||colour OSD||colour OSD|
|Tuner||AM, FM||AM, FM|
|Auto power off||✔||✔|
|Graphical user interface (GUI)||✔||✔|
|Firmware update||network, USB||network, USB|
|Other additional features||IP Control||Web Control, App Control|
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.
|Multi-room zones||3||has not|
|Zone audio output||speaker, preout||has not|
|Zone HDMI output||✔||has not|
|Multi-room control||HEOS App||HEOS App, Denon 2016 AVR Remote|
|Remote control input/output (IR)||1/1||0/0|
|DC trigger output (12V)||2||0|
Denon AVR-X4500H got 9 points for the multichannel surround sound and Denon AVR-S660H got 8.
Auro 3D gives a bit more versatility than Dolby Atmos or DTS:X and provides a hemispherical sound and enables a receiver to produce 3D sound stages. Only the Denon AVR-X4500H has Auro-3D on its feature list.
|Dolby (other)||Dolby Digital Plus||Dolby Atmos Height Virtualization|
|DTS HD Master||✔||✔|
|DTS (other)||DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS, DTS-Surround||DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS|