To get informed with the specs of the receivers, we suggest you read the Denon AVR-S660H and Yamaha RX-A4A review. According to the results of our review, Denon AVR-S660H received 6.7 points out of 10 possible, and Yamaha RX-A4A was rated 8.7 points. Both AV receivers were introduced in 2021. This review shows us that the RX-A4A is a better choice as a home AV receiver than the AVR-S660H.
For the built-in amplifier, the devices received different marks - 6 and 8, respectively, on a 10-point scale.
The number of channels is equal to the number of possible connected speakers. The Denon AVR-S660H supports 5.2-channels sound, but Yamaha RX-A4A 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 RX-A4A this value is 110/8 W/Ohm, and for the AVR-S660H it is 75/8 W/Ohm.
|Stereo power (RMS), W/Ohm||75/8, 100/6||110/8|
|Output impedance, Ohm||8, 6||8|
|THD in stereo, %||0.08||0.06|
After reviewing the audio features of each model, we can rate the AVR-S660H 6 out of 10, and the RX-A4A - 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 RX-A4A.
Pure Direct mode feeds sound directly to the amplifier and bypasses any DSP processing. Only Yamaha RX-A4A 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.
|Digital to analog converter (DAC)||192 KHz/32-bit||384 KHz/32-bit|
|Pure direct (straight)||✖||✔|
|Auto speaker calibration||Audyssey MultEQ||YPAO|
|Speaker A/B switching||✖||✖|
|Other audio features||Audyssey Dynamic Volume, Audyssey Dynamic EQ, Hi-Res audio||CINEMA DSP 3D, Compressed Music Enhancer, Virtual CINEMA FRONT|
The connectivity of competitors in our comparison is markedly different, Denon AVR-S660H scored 7, and Yamaha RX-A4A scored 9 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, SiriusXM, Napster, SoundCloud||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-S660H got 7 points, but Yamaha RX-A4A received 8 points.
Denon AVR-S660H is equipped with 6/1 HDMI inputs and outputs, and Yamaha RX-A4A has 7/3 HDMI inputs and outputs.
|HDMI ARC (Audio Return Channel)||✔||✔|
|HDMI eARC (Enhanced Audio Return Channel)||✔||✔|
|Digital content protection (HDCP)||HDCP 2.3||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||1||1|
|Phono (MM) input||✔||✔|
|Front panel connectors||USB, 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 rivals in our comparison were rated 8 out of 10.
|HDR (High Dynamic Range)||HDR10+||HDR10+|
|4K signal pass-through||4K/120Hz||4K/120Hz|
|8K signal pass-through||8K/60Hz||8K/60Hz|
|HDMI signal pass-through||✔||✔|
|3D signal pass-through||✔||✖|
|HDMI pass-through in standby mode||✔||✔|
|Analog to HDMI scaling||✖||✖|
|HDMI to HDMI scaling||✔||✔|
|Other video features||Dynamic HDR, HLG, BT.2020||x.v.Color, HLG, BT.2020, LipSync|
In terms of evaluating additional features, both receivers received a score of 10 out of 10.
|Voice control||Amazon Alexa, Google Assistant, Siri, Josh.AI||Amazon Alexa, Google Assistant, Siri, Josh.AI|
|App control||iPhone, iPad, iPod, Android||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||Web Control, App 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||has not||2|
|Zone audio output||has not||preout|
|Zone HDMI output||has not||✔|
|Multi-room control||HEOS App, Denon 2016 AVR Remote||MusicCast|
|Remote control input/output (IR)||0/0||1/1|
|DC trigger output (12V)||0||2|
Denon AVR-S660H got 8 points for the multichannel surround sound and Yamaha RX-A4A got 7.
|Dolby (other)||Dolby Atmos Height Virtualization||Dolby Digital Plus, Dolby Atmos Height Virtualization|
|DTS HD Master||✔||✔|
|DTS (other)||DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS||DTS-ES, DTS-HD|