Let's make the Onkyo TX-SR383 versus Onkyo TX-RZ740 comparison. According to the results of our review, Onkyo TX-SR383 received 4.8 points out of 10 possible, and Onkyo TX-RZ740 was rated 8.5 points. The release date of TX-SR383 is 2018, and TX-RZ740 is 2019. After comparison, it will become clear that among these two devices, the TX-RZ740 is more suitable for the role of the heart of home theater system.
For the built-in amplifier, the devices received different marks - 7 and 9, respectively, on a 10-point scale.
The number of channels is equal to the number of possible connected speakers. The Onkyo TX-SR383 supports 7.2-channels sound, but Onkyo TX-RZ740 supports a 9.2-channels configuration.
RMS stands for the actual power of the receiver. The higher this value, the louder the sound can be produced. In terms of RMS power, the models have the same characteristics - 100/8, 135/6/8 W/Ohm.
|Stereo power (RMS), W/Ohm||100/8, 135/6||100/8, 225/6|
|Output impedance, Ohm||8, 6||8, 6|
|THD in stereo, %||0.09||0.08|
After reviewing the audio features of each model, we can rate the TX-SR383 6 out of 10, and the TX-RZ740 - 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-RZ740.
Pure Direct mode feeds sound directly to the amplifier and bypasses any DSP processing. Only Onkyo TX-RZ740 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/24-bit||AK4458 384 KHz/32-bit|
|Pure direct (straight)||✖||✔|
|Auto speaker calibration||Audyssey MultEQ||AccuEQ|
|Speaker A/B switching||✖||✖|
|Other audio features||Advanced Music Optimizer||Advanced Music Optimizer, Hi-Res audio, Dynamic Audio Amplification|
The connectivity of competitors in our comparison is markedly different, Onkyo TX-SR383 scored 6, and Onkyo TX-RZ740 scored 8 out of 10.
Wireless connection via Wi-Fi is possible on the Onkyo TX-RZ740.
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|
|Other streaming services||has not||Deezer, TIDAL, Pandora, TuneIn Radio|
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, Onkyo TX-SR383 got 6 points, but Onkyo TX-RZ740 received 8 points.
Onkyo TX-SR383 is equipped with 4/1 HDMI inputs and outputs, and Onkyo TX-RZ740 has 7/2 HDMI inputs and outputs.
Connecting a vinyl player or phonograph is possible using a Phono input which is represented by mini-jack or RCA connectors. Only the TX-RZ740 has a Phono interface.
|HDMI ARC (Audio Return Channel)||✔||✔|
|HDMI eARC (Enhanced Audio Return Channel)||✖||✖|
|Digital content protection (HDCP)||HDCP 2.2||HDCP 2.2|
|Subwoofer output (LFE)||2||2|
|Headphone output||1 x 6.3||1 x 6.3|
|Optical digital input||1||1|
|Coaxial digital input||1||1|
|Phono (MM) input||✖||✔|
|Front panel connectors||USB, phones, setup mic||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 TX-SR383 were rated 6 out of 10 against the 8 for the TX-RZ740.
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 Onkyo TX-RZ740.
|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||✔||✔|
|Analog to HDMI scaling||✖||✖|
|HDMI to HDMI scaling||✖||✔|
|Other video features||DeepColor, x.v.Color, BT.2020, HLG||DeepColor, x.v.Color, HLG, BT.2020|
In terms of evaluating additional features, the TX-SR383 got 4 points, but the TX-RZ740 has 9.
Voice control allows you to control the basic functions of the receiver through a smartphone, smart speaker or using the microphone that comes with the kit. The TX-RZ740 can be controlled by voice via Google Assistant.
|Voice control||✖||Google Assistant|
|App control||iPhone, iPod, Android||iPhone, iPad, iPod, Android|
|Tuner||AM, FM||AM, FM|
|Auto power off||✖||✔|
|Graphical user interface (GUI)||✖||✔|
|Firmware update||USB||network, USB|
|Other additional features||has not||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||has not||FlareConnect|
|Remote control input/output (IR)||0/0||1/0|
|DC trigger output (12V)||0||1|
Onkyo TX-SR383 got 5 points for the multichannel surround sound and Onkyo TX-RZ740 got 8.
Dolby Atmos' particularity is that this is the object-oriented sound format, that is, each audio signal object is independently sounded and connected to its spatial position. Onkyo TX-RZ740 can create 3D sound due to the Dolby Atmos support.
DTS:X is an algorithm used by the processor to create sound scenes, where sounds connected directly to objects rather than channels, and to determine the optimum sound output distribution in space. Surround sound with DTS:X is available on the TX-RZ740.
IMAX Enhanced is a licensing and certification program under which home theater devices deliver crisp 4K HDR pictures and powerful sound as it was designed by the IMAX engineers. The TX-RZ740 licensed by IMAX.
|Dolby (other)||Dolby Pro Logic||Dolby Digital Plus, Dolby Atmos Height Virtualization|
|DTS HD Master||✔||✔|
|DTS (other)||has not||DTS-ES, DTS 96/24, DTS-HD, DTS-EXPRESS|