Onkyo TX-NR646 vs Onkyo TX-SR353 review

Votes 1 1
Rating 5 5

AV receivers comparison chart

Onkyo TX-NR646 vs Onkyo TX-SR353 review

Onkyo TX-NR646
vs
Onkyo TX-SR353

The present review is aimed to compare two AV receivers - Onkyo TX-NR646 vs Onkyo TX-SR353 that are meant to satisfy the needs of cinema and music lovers.

Amplifier

A significant difference between the receivers in the number of channels, Onkyo TX-NR646 has 7.2 versus 5.1 for Onkyo TX-SR353. Regarding power, then TX-NR646 has such a W/Ohm ratio - 160/6 when TX-SR353 has a power of 140/6. The THD is the same and is 0.08%.

Audio features

Characteristics of digital to analog converter (DAC) are different, Hi-Grade 384 KHz/32-bit for TX-NR646 and 192 KHz/24-bit for the TX-SR353. Only the TX-NR646 supports Bi-amping feature. The Onkyo TX-NR646 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.

Connectivity

Only the Onkyo TX-NR646 can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the TX-NR646 supports Spotify.

Video features

Only the Onkyo TX-NR646 has support for High dynamic range (HDR). HDMI signal transmission in standby mode is implemented in each of the devices. Both competitors are not able to scale the HDMI signal. The HDR standard - Dolby Vision is not supported by these receivers.

Extensive connections

The Onkyo TX-NR646 has 8/2 HDMI inputs/outputs versus 4/1 HDMI connectors of the Onkyo TX-SR353.Onkyo TX-NR646 connectionsOnkyo TX-SR353 connections The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The TX-NR646 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is only available for the TX-NR646. The setup assistant will help you configure Onkyo TX-NR646.

Multichannel surround

Only the TX-NR646 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-NR646.

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General

Item

Onkyo TX-NR646
Onkyo TX-SR353

Model

TX-NR646
TX-SR353

Brand

Onkyo
Onkyo

Reviews

414
59

Amplifier

Channels

7.2
5.1

Stereo power (RMS), W/Ohm

160/6
140/6

Output impedance, Ohm

6
6

Frequency response

10Hz-100KHz
20Hz-20KHz

THD in stereo, %

0.08
0.08

Audio features

Digital to analog converter (DAC)

Hi-Grade 384 KHz/32-bit
192 KHz/24-bit

Bi-amping

Pure direct (straight)

Auto speaker calibration

AccuEQ
AccuEQ

Speaker A/B switching

Other audio features

Theater-Dimensional, Double Bass Function, CinemaFILTER
has not

Connectivity

Wi-Fi

USB

1 (USB 2.0)
1 (USB 2.0)

Bluetooth

Ethernet (RJ45)

1

DLNA

MHL

Streaming services

Apple Music (AirPlay)

AirPlay

Amazon Music

Spotify

Other streaming services

Deezer, TuneIn Radio
has not

Extensive connection

HDMI input/output

8/2
4/1

HDMI ARC (Audio Return Channel)

HDMI eARC (Enhanced Audio Return Channel)

HDMI CEC

Digital content protection (HDCP)

HDCP 2.2
HDCP 2.2

Subwoofer output (LFE)

2
1

Headphone output

1 x 6.3
1 x 6.3

Optical digital input

2
1

Coaxial digital input

1
1

Composite input

3
2

Component input/output

2/0
0/0

Phono (MM) input

Front panel connectors

USB, HDMI, phones, setup mic, AUX
USB, phones, setup mic

Multi channel preamp output

Video features

HDR (High Dynamic Range)

4K signal pass-through

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

Analog to HDMI scaling

HDMI to HDMI scaling

Dolby Vision

Other video features

DeepColor, x.v.Color
DeepColor, x.v.Color

Additional features

Voice control

App control

iPhone, iPad, iPod, Android

Display

fluorescent
fluorescent

Tuner

AM, FM
AM, FM

Sleep timer

Auto power off

ECO mode

Graphical user interface (GUI)

Setup assistant

Firmware update

network, USB

Other additional features

has not
has not

Multi-room

Multi-room zones

2
has not

Zone audio output

speaker, preout
has not

Zone HDMI output

has not

Multi-room control

Onkyo Remote App
has not

RS-232

0
0

Remote control input/output (IR)

1/0
0/0

DC trigger output (12V)

0
0

Multichannel surround

Dolby Atmos

Dolby TrueHD

Dolby Surround

Dolby (other)

Dolby Digital Plus
Dolby Digital Plus

DTS:X

DTS HD Master

DTS Virtual:X

DTS Neural:X

DTS (other)

has not
DTS-EXPRESS

Auro-3D

IMAX Enhanced

Multichannel stereo

Audio file formats

MP3

WMA

AAC

WAV

FLAC

ALAC

Other audio file formats

has not
has not

Power

Operational power consumption, W

630
210

Standby consumption, W

0.15
0.45

Removable power cord

User manual

Manual

Dimensions

Size W x H x D, cm/inches

43.5 x 17.3 x 33/17 x 6.8 x 13
43.5 x 16.8 x 32.6/17 x 6.2 x 12.6

Weight, kg/lbs

9.4/19.8
8/17

Other

Release year

2015
2016
Onkyo TX-NR646
Onkyo TX-SR353
Onkyo TX-NR646
Onkyo TX-SR353

AV receivers SoundInspiration comparison rating

  • better
  • worse
  • 7.4
  • 4
  • 7.4Onkyo TX-NR646
  • 4Onkyo TX-SR353