Onkyo TX-NR555 vs Onkyo TX-NR646 review

Votes 1 1
Rating 5 5
Onkyo TX-NR555
vs
Onkyo TX-NR646

The Onkyo TX-NR555 vs Onkyo TX-NR646 comparison proves that these receivers have many common features.

Amplifier

Considered AV receivers have the same number of channels 7.2. Regarding power, then TX-NR555 has such a W/Ohm ratio - 130/6 1KHz when TX-NR646 has a power of 160/6 1KHz. The THD is the same and is 0.08%.

Audio features

Competitors' digital to analog converter (DAC) is identical to Hi-Grade 384 KHz/32-bit. Both the TX-NR555 and the TX-NR646 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay. Spotify can be used on each receiver. The TX-NR555 can work with the audio stream from Deezer, TIDAL, Pandora, and the TX-NR646 can receive a content from Deezer, TuneIn Radio.

Video features

These units support HDR technology. Compared AV receivers retain the quality of 4K 60p signal when transmitting from a source to a TV or projector. 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-NR555 has 6/1 HDMI inputs/outputs versus 8/2 HDMI connectors of the Onkyo TX-NR646.Onkyo TX-NR555 connectionsOnkyo TX-NR646 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. These compared receivers have a built-in phono stage for connecting a vinyl player.

Additional features

Each of the AV receivers from our review supports 2 Multi-room zones. A voice control is not available. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Onkyo TX-NR646.

Multichannel surround

Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.

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Common

Product

Onkyo TX-NR555
Onkyo TX-NR646

Model

TX-NR555
TX-NR646

Brand

Onkyo
Onkyo

Reviews

82
417

Amplifier

Channels

7.2
7.2

Stereo power (RMS), W/Ohm

130/6 1KHz
160/6 1KHz

Output impedance, Ohm

6
6

Frequency response

10Hz-100KHz
10Hz-100KHz

THD in stereo, %

0.08
0.08

Audio features

Digital to analog converter (DAC)

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

Bi-amping

Pure direct (straight)

Auto speaker calibration

AccuEQ
AccuEQ

Speaker A/B switching

Connectivity

Wi-Fi

2.4/5GHz

USB

1 (USB 2.0)
1 (USB 2.0)

Bluetooth

Ethernet (RJ45)

1
1

Streaming services

Apple Music (AirPlay)

AirPlay
AirPlay

Google Play Music

Amazon Music

Spotify

Other streaming services

Deezer, TIDAL, Pandora
Deezer, TuneIn Radio

Video features

HDR (High Dynamic Range)

4K signal pass-through

4K 60p
4K 60p

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
iPhone, iPad, iPod, Android

Display

colour OSD
fluorescent

Tuner

AM, FM
AM, FM

Sleep timer

Auto power off

ECO mode

Graphical user interface (GUI)

Setup assistant

Firmware update

network, USB
network, USB

Other additional features

has not
has not

Extensive connection

HDMI input/output

6/1
8/2

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
2

Headphone output

1 x 6.3
1 x 6.3

Optical digital input

2
2

Coaxial digital input

1
1

Composite input

2
3

Component input/output

2/0
2/0

Phono (MM) input

Front panel connectors

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

Multi channel preamp output

Multi-room

Multi-room zones

2
2

Zone audio output

speaker, preout
speaker, preout

Zone HDMI output

Multi-room control

FlareConnect
Onkyo Remote App

RS-232

0
0

Remote control input/output (IR)

0/0
1/0

DC trigger output (12V)

0
0

Multichannel surround

Dolby Atmos

Dolby TrueHD

Dolby Surround

DTS:X

DTS HD Master

DTS Virtual:X

Auro-3D

Power

Operational power consumption, W

460
630

Standby consumption, W

0.1
0.15

Removable power cord

User manual

Manual

Dimensions

Size W x H x D, cm/inches

43.5 x 17.3 x 37.8/17 x 6.7 x 14.5
43.5 x 17.3 x 33/17 x 6.8 x 13

Weight, kg/lbs

9.4/20.7
9.4/19.8
Onkyo TX-NR555
Onkyo TX-NR646
Onkyo TX-NR555
Onkyo TX-NR646

AV receivers SoundInspiration comparison rating

  • better
  • worse
  • 7
  • 7.4
  • 7Onkyo TX-NR555
  • 7.4Onkyo TX-NR646

The Onkyo TX-NR646 is better receiver in this comparison. Check Onkyo TX-NR646 price

Onkyo TX-NR555 competitors