The Denon AVR-S750H versus Denon AVR-X6400H comparison makes clear all pros and cons of AV receivers. According to the results of our review, Denon AVR-S750H received 7 points out of 10 possible, and Denon AVR-X6400H was rated 9.4 points. The release date of AVR-S750H is 2019, and AVR-X6400H is 2017. Identified advantages have shown that AVR-X6400H is better over AVR-S750H mainly as a home theater processor.
For the built-in amplifier, the devices received different marks - 7 and 10, respectively, on a 10-point scale.
The number of channels is equal to the number of possible connected speakers. The Denon AVR-S750H supports 7.2-channels sound, but Denon AVR-X6400H supports a 11.2-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-X6400H this value is 140/8 W/Ohm, and for the AVR-S750H it is 75/8 W/Ohm.
|Stereo power (RMS), W/Ohm||75/8, 110/6||140/8, 250/6|
|Output impedance, Ohm||8, 6||8, 6|
|THD in stereo, %||0.08||0.05|
After reviewing the audio features of each model, we can rate the AVR-S750H 6 out of 10, and the AVR-X6400H - 10.
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 AVR-X6400H.
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-X6400H can work with the main and additional set of speakers - and switch between them.
|Digital to analog converter (DAC)||AKM 192 KHz/32-bit||AK4458 384 KHz/32-bit|
|Pure direct (straight)||✔||✔|
|Auto speaker calibration||Audyssey MultEQ||Audyssey MultEQ XT32|
|Speaker A/B switching||✖||✔|
|Other audio features||Audyssey Dynamic Volume, Audyssey Dynamic EQ, Compressed Audio Restorer, Hi-Res audio||Audyssey Dynamic Volume, Audyssey Dynamic EQ, Audyssey LFC|
The connectivity of competitors in our comparison is markedly different, Denon AVR-S750H scored 7, and Denon AVR-X6400H scored 8 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, Mood Mix||Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud|
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-S750H got 7 points, but Denon AVR-X6400H received 10 points.
Denon AVR-S750H is equipped with 6/1 HDMI inputs and outputs, and Denon AVR-X6400H has 8/3 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-S750H in the HDCP 2.3 version, and Denon AVR-X6400H has the HDCP 2.2 version.
|HDMI ARC (Audio Return Channel)||✔||✔|
|HDMI eARC (Enhanced Audio Return Channel)||✔||✔|
|Digital content protection (HDCP)||HDCP 2.3||HDCP 2.2|
|Subwoofer output (LFE)||2||2|
|Headphone output||1 x 6.3||1 x 6.3|
|Optical digital input||2||2|
|Coaxial digital input||1||2|
|Phono (MM) input||✔||✔|
|Front panel connectors||USB, HDMI, phones, setup mic||USB, HDMI, phones, setup mic, AUX|
|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-S750H were rated 6 out of 10 against the 9 for the AVR-X6400H.
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 with Denon AVR-X6400H.
|HDR (High Dynamic Range)||HDR10||✔|
|4K signal pass-through||4K/60Hz||4K/60Hz|
|8K signal pass-through||✖||✖|
|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||HLG|
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, Amazon Kindle||iPhone, iPad, iPod, Android, Amazon Kindle|
|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||IP 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.
|Zone audio output||speaker||speaker, preout|
|Zone HDMI output||✖||✔|
|Multi-room control||HEOS App||HEOS App, Denon 2016 AVR Remote|
|Remote control input/output (IR)||0/0||1/1|
|DC trigger output (12V)||0||2|
Denon AVR-S750H got 7 points for the multichannel surround sound and Denon AVR-X6400H got 9.
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. Denon AVR-X6400H has Auro-3D on its feature list.
|Dolby (other)||Dolby Digital Plus, Dolby Atmos Height Virtualization||Dolby Digital Plus|
|DTS HD Master||✔||✔|
|DTS (other)||DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS||DTS-ES, DTS 96/24, DTS-EXPRESS, DTS Surround|