Yamaha RX-A660 vs Yamaha RX-A550 Detailed Comparison
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SCORE:
79
SCORE:
73

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Overview

Here we are comparing Yamaha Aventage RX-A660 to Yamaha Aventage RX-A550 to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. The Yamaha Aventage RX-A660 has 7 channel and the Yamaha Aventage RX-A550 has 5 channel and equally powerful amplifiers.

Let us have a look at some highlights of the models.

Yamaha Aventage RX-A660 Highlights

Yamaha Aventage RX-A550 Highlights

  • 7.2 channels
  • 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • Dolby Atmos, DTS:X capable
  • HDR10, 4K Passthrough
  • AirPlay, DLNA, MusicCast
  • Ethernet, Wi-Fi, Bluetooth
  • USB input
  • 5.1 channels
  • 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • 1080p Upscaling, 4K Passthrough
  • AirPlay, DLNA, MusicCast
  • Ethernet, Wi-Fi, Bluetooth
  • USB input

We have evaluated both receivers. Yamaha Aventage RX-A660 gets higher overall score in our ranking system which is based on the amplifier specifications, audio and video features, connectivity, multizone capabilities, radio and many other details.

Yamaha Aventage RX-A660

Yamaha Aventage RX-A550

AMPLIFIER
84
VIDEO FEATURES
81
AUDIO FEATURES
85
CONNECTIVITY
79
MULTIZONE
55
MISCELLANEOUS
60
RADIO
79
OVERALL
79
AMPLIFIER
80
VIDEO FEATURES
71
AUDIO FEATURES
71
CONNECTIVITY
81
MULTIZONE
55
MISCELLANEOUS
51
RADIO
79
OVERALL
73

Amplifier score is based on power ratings, minimum impedance load, power supply, transformer type, total harmonic distortion, damping factor, signal to noise ratio and other small details. Audio score depends on the number of channels, front wide channel support, maximum channel processing, support of audio formats, DAC specifications, room calibration algorithm... Video score is based on HDR, Dolby Vision and 4K passthrough, upscaling, analog to HDMI upconversion. Connectivity score is defined from all wired and wireless inputs and outputs, internet and bluetooth connections, HEOS, SONOS and others. Multizone score depends on the number of zones with their outputs. Radio score is evaluated form digital radio support and analog tuner with its frequency range, signal to noise ratio, harmonic distortion...

Advantage of Yamaha Aventage RX-A660

This section shows those features and specifications which are the reason to choose Yamaha Aventage RX-A660 over Yamaha Aventage RX-A550.

Yamaha Aventage RX-A660 has more channels and more channel processing. It supports Dolby Atmos and DTS:X. It has bi-amp capability and DTS Dialog Control. In video department only Yamaha Aventage RX-A660 supports HDR10.

Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
More Channels 7.2 5.1
Bi-amp capability
More Channel Processing 7.1 5.1
Dolby Atmos up to 5.1.2
Dolby Surround Upmixer
DTS:X up to 5.1.2
DTS Neural:X
DTS Dialog Control
Dialog Level Adjustment
Dialogue Lift no presence speakers required
HDR10
BT.2020 color space
Zone B Video Output
More Speaker Terminals 7 5
More Large Speaker Terminals 7 5
Higher Dynamic Power per Channel, 2 Ω, Front) 190 W 160 W
Higher Dynamic Power per Channel, 4 Ω, Front) 170 W 130 W
Higher Dynamic Power per Channel, 6 Ω, Front) 140 W 110 W
Higher Dynamic Power per Channel, 8 Ω, Front) [a] [a]

Advantage of Yamaha Aventage RX-A550

This section shows those features and specifications which are the reason to choose Yamaha Aventage RX-A660 over Yamaha Aventage RX-A550.

Yamaha Aventage RX-A660 has more channels and more channel processing. It supports Dolby Atmos and DTS:X. It has bi-amp capability and DTS Dialog Control. In video department only Yamaha Aventage RX-A660 supports HDR10.

Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Dolby Pro Logic PLII
Video Signal Upscaling up to 1080p
More HDMI Inputs 4 6
More Component Video Inputs 2
More Component Video Outputs 1

Common Strengths and Weaknesses

Here we list common strengths and weaknesses of both receivers.

STRENGTHS
Dolby TrueHD 👍
Dolby Digital Plus 👍
DTS Neo 👍
DTS-HD Master Audio 👍
DTS-HD High Resolution Audio 👍
DTS 96/24 👍
DTS Express 👍
DTS-ES 👍
High Resolution Music Playback via USB and/or Network 👍
Gapless Playback 👍
DSD via HDMI 👍
DSD via USB 👍
Compressed Music Enhancer 👍
Adaptive DRC (Dynamic Range Control) 👍
Auto Speaker Calibration System with Mic. 👍
3-D Ready 👍
4K or 8K Video Passthrough 👍
DLNA 1.5 👍
MusicCast 👍
Works with Amazon Alexa 👍
Ethernet 👍
Wi-Fi 👍
Bluetooth 👍
New HDCP Version 👍
USB Input 👍
Composite Video Inputs 👍
Composite Video Outputs 👍
Zones 👍
Analog Tuner 👍
Spotify 👍
WEAKNESSES
No Dolby Atmos Height Virtualization 👎
No DTS Virtual:X 👎
No IMAX Enhanced 👎
No Auro 3D with Auro-Matic Upmixer 👎
No High-resolution Music Enhancer 👎
No HDR10+ 👎
No Dolby Vision 👎
No Hybrid Log Gamma (HLG) 👎
No 4K or 8K Video Upscaling 👎
No Chromecast Built-In 👎
Does Not Work with SONOS 👎
No eARC 👎
Few HDMI Outputs 👎
No Phono Input 👎
No Multi-Channel Input 👎
No Analog Pre-Outs 👎
No Pandora 👎
No Tidal 👎
No Deezer 👎
No Napster 👎
No SiriusXM Internet Radio 👎
Old Bluetooth Version 👎

Selected Features

Amplifier

Yamaha Aventage RX-A660 has 7 channel and Yamaha Aventage RX-A550 has 5 channel amplifiers. They both deliver 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven) but only Yamaha Aventage RX-A550 has stable performance at 4 Ω load.


Video Features

Both receivers support 4K passthrough up to 60p. Yamaha Aventage RX-A550 can do 1080p upscaling. Yamaha Aventage RX-A660 supports HDR10.


HDR10

High-dynamic-range (HDR) video has greater dynamic range than standard-dynamic-range (SDR) video with brigter whites and deeper blacks. HDR10 was announced on August 27, 2015, by the Consumer Technology Association and uses the wide-gamut Rec. 2020 color space. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 supports up to 1000 nits of brightness and 10-bit color which corresponds to 1024 shades of the primary RGB colors.


Dolby Atmos and Dolby Surround upmixer

Yamaha Aventage RX-A660 supports Dolby Atmos with its Dolby Surround upmixer. It can be configured upto 5.1.2 channels using internal amplifiers.

Dolby Atmos is the first cinematic audio format in which sounds exist as individual entities, called audio objects. In Dolby Atmos, any sound - the helicopter, a car screeching around a corner, a melodic bird call - can exist as an independent audio object, free of channel restrictions. They can be precisely placed and moved anywhere in your room, including overhead, to flow above and around you in three-dimensional space. Through the use of audio objects, overhead sound, and all the richness, clarity, and power of Dolby sound, Dolby Atmos turns your room into an amazing place for entertainment. You'll feel like you're inside the action, in ways you've never experienced before.

Dolby Atmos for the home represents every sound in the original cinema mix as an audio object. Extensions to the Dolby Audio™ codecs, along with an advanced scalable algorithm, allow Dolby Atmos to be delivered via Blu-ray Disc and streaming media. A spatially-coded substream is added to Dolby TrueHD or Dolby Digital Plus. A Dolby Atmos audio/video receiver (AVR) adapts the cinema experience to your home theater from seven speakers to as many as 34 in 24.1.10 configuration, recreating the original artistic concept. The format supports up to 128 simultaneous independent audio objects in a mix for rich, realistic, and breathtaking sound. It recreates the director's original concept through descriptive metadata to provide customized playback for home theater and delivers sounds above you through overhead speakers, special upward-firing Dolby Atmos speakers, or a Dolby Atmos enabled sound bar.

If the content is not mixed in Dolby Atmos then the Dolby surround upmixer will expand the audio to all channels including ceiling speakers. The upmixer has replaced the Dolby Pro Logic II family with improved upmixing algorithms.


DTS:X and Neural:X upmixer

Yamaha Aventage RX-A660 supports DTS:X. It can be configured upto 5.1.2 channels using internal amplifiers.

A technique used in DTS:X is similar to the one used in Dolby Atmos. Instead of a fixed number of channels, DTS:X defines object locations from the listener in polar coordinates. An a/v receiver then dynamically renders sound according to the current speaker configuration. The speaker layout employed by DTS:X is the sum of Dolby Atmos and Auro-3D. It has standard 7.1 channel base layer, a 5 channel height layer above the base layer on the front and side walls, and 3 rows of speakers on the ceiling.

DTS Neural:X is an upmixer that can take non DTS:X content and upmix it to the DTS:X speaker layout. It has replaced the DTS Neo family with improved flexibility.


Adaptive DRC

Yamaha Aventage RX-A660 and Yamaha Aventage RX-A550 feature Adaptive DRC (Dynamic Range Control) which automatically adjusts the dynamic range of the sound according to the volume level. This ensures that you hear clear dialog and vocals, and all sound effects at comfortable levels. There is no need to adjust the volume level as you listen; everything from whispers to big explosions will be heard clearly and comfortably at the same volume setting. It also tones down loud TV commercials, and is ideal for low-volume, late-night listening, when you do not want to disturb others.


Connectivity


Yamaha Aventage RX-A660

Yamaha Aventage RX-A660 can be connected to internet using ethernet cable or built-in wi-fi adapter. It can also connect to bluetooth devices via built-in bluetooth adapter. The Receiver works with Amazon Alexa and supports[y] AirPlay. It has 4 HDMI inputs with HDCP 2.2 copy protection.

Front panel has USB and mini-jack Audio inputs.

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Yamaha Aventage RX-A550

Yamaha Aventage RX-A550 can be connected to internet using ethernet cable or built-in wi-fi adapter. It can also connect to bluetooth devices via built-in bluetooth adapter. The Receiver works with Amazon Alexa and supports[y] AirPlay. It has 6 HDMI inputs with HDCP 2.2 copy protection.

Front panel has USB and mini-jack inputs.

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Detailed Specifications

And in the end let us list the detailed specifications of the receivers side-by-side.

Note: The following table shows only those details which are applicable for both models and excludes the ones that are applicable for only one model. If you want to see a full list of specs for each model please visit their individual pages here - Yamaha Aventage RX-A660 and here - Yamaha Aventage RX-A550.

BASICS Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
BrandYamahaYamaha
SeriesAventageAventage
ModelRX-A660RX-A550
TypeA/V ReceiverA/V Receiver
CountryKoreaKorea
Release Year20162015
AMPLIFIER Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Channels7.25.1
THX™ Certification
Continuous 6 Ω Rated
Bi-amp Capability
AUDIO Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Surround:AI™
DACBurr-BrownBurr-Brown
Maximum Channel Processing7.15.1
Air Studios Monitor Certification
Dolby Atmos up to 5.1.2
Dolby Atmos Height Virtualization
Dolby TrueHD
Dolby Digital Plus
Dolby Surround Upmixer
Dolby Pro Logic PLII
Dolby Digital EX
DTS:X up to 5.1.2
DTS Neural:X
DTS Virtual:X
DTS Neo Neo:6 Neo:6
DTS-HD Master Audio
DTS-HD High Resolution Audio
DTS 96/24
DTS Express
DTS-ES Discrete 6.1, Matrix 6.1 Discrete 6.1, Matrix 6.1
IMAX Enhanced
Auro 3D with Auro-Matic Upmixer
PCM 2-ch/Multi-ch Input 2-ch/Multi-ch Input
Music Playback via USBMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSDMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
High Resolution Music Playback via USB and/or Network up to 192 kHz up to 192 kHz
High Resolution Audio Formats via USBApple Lossless, WAV, FLAC, AIFF, DSDApple Lossless, WAV, FLAC, AIFF, DSD
Multi-Channel Music File Playback via USB
Gapless Playback
DSD via HDMI 2-ch/Multi-ch Input 2-ch/Multi-ch Input
DSD via USB 2-ch Input 2-ch Input
DSD to PCM Converter
USB DAC
DTS Dialog Control
Dialog Level Adjustment
Dialog Normalization
Dialogue Lift no presence speakers required
Compressed Music Enhancer including for Bluetooth® including for Bluetooth®
High-resolution Music Enhancer
Adaptive DRC (Dynamic Range Control)
Initial Volume & Maximum Volume Setting
Audyssey Dynamic EQ
Audyssey Dynamic Volume
Audyssey LFC
Audyssey Sub EQ HT
Audyssey DSX
Direct Mode
Straight Decoding Mode
CINEMA DSP 3D 3D
DSP Programs1717
SILENT CINEMA / Virtual CINEMA DSP Virtual CINEMA FRONT Virtual CINEMA FRONT
Virtual Speakers including surround back
CALIBRATION Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Auto Speaker Calibration System with Mic. YPAO sound optimization YPAO sound optimization
YPAO Volume
PEQ for SUBDown to 31 HzDown to 31 Hz
VIDEO Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Video Signal TypeNTSCNTSC
HDR10
HDR10+
Dynamic HDR
BT.2020 color space
Dolby Vision
Hybrid Log Gamma (HLG)
Quick Media Switching (QMS)
Auto Low Latency Mode Pass-through
Variable Refresh Rate (VRR)
Quick Frame Transport (QFT)
3-D Ready
Video Signal Passthroughup to 4K 60p 4:4:4up to 4K/60p 4:2:0
Video Signal Upscaling up to 1080p
Analog To HDMI Upconversion
Component Video Upscaling
Analog to Analog Video conversion
Video Parameter Adjustments
isf Certified Calibration Control
CONNECTIVITY Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
MHL Input
DLNA 1.5
FireConnect
FlareConnect
MusicCast
Chromecast Built-In
DTS Play-Fi
Works with Amazon Alexa on MusicCast (Voice control using your Alexa device like Echo, Dot, Tap and Show) on MusicCast (Voice control using your Alexa device like Echo, Dot, Tap and Show)
Works with SONOS
AirPlay AirPlay AirPlay
Apple Product Connection iPod, iPhone and iPad iPod, iPhone and iPad
Remote App (iPhone® / iPad® / Android™ phone / tablet) (iPhone® / iPad® / Android™ phone / tablet)
InstaPrevue Input Source Prevue
Ethernet
Ethernet Switch
Wi-Fi with Wireless Direct with Wireless Direct
Bluetooth SBC, AAC
HDBaseT Compatible
Enhanced ARC
HDCP Version2.22.2
HDMI Input46
HDMI Output11
USB InputUSB memory, portable audio playeriPod® / iPhone®, USB memory, portable audio player
USB DC Out Port
Analog Audio Line Input4 (1 front)4 (1 AUX Jack in the front)
Analog Audio Line Output
Phono Input
Optical In11
Optical Out
Coaxial In/Out2 / 2 /
Composite Video Input44
Composite Video Output11
S-Video Input
S-Video Output
Component Video Input 2
Component Video Output 1
PC In
Multi-Channel Input
Analog Pre-Outs0.20.1
XLR Inputs
XLR Pre-outs
Front A/V InputsUSB, mini-jack AudioUSB, mini-jack
Speaker A/B
Headphone Out 6.3 mm 6.3 mm
ZONES Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Zones11
Zone B Video Output
RS-232
+12V Trigger Output
Remote (IR) Input/Output0 / 00 / 0
Party Mode
MISC Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
On-Screen Display color OSD color OSD
SCENESCENE (4 sets)SCENE (4 sets)
Web Browser Control
PreAmp Mode
Remote Controller
Detachable Power Cord
dockport
RADIO Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Analog Tuner FM/AM FM/AM
Presets4040
Digital Radio
Internet Radio vTuner vTuner
Pandora
Spotify
Tidal
Deezer
Napster
SiriusXM Internet Radio
CONSTRUCTION Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
A.R.T. Wedge
Speaker Terminals75
Large Speaker Terminals75
Color-Coded Speaker Terminals
Gold plated RCA terminals
POWER Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Power SupplyAC 220 V, 60 HzAC 220 V, 60 Hz
Power Consumption260 W260 W
Standby Power0.1 W0.1 W
GENERAL Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
ECO Mode / Hybrid Standby Function
Auto Power Standby
Dimensions (W x H x D)435 mm x 161 mm x 330 mm (with antenna: 435 mm x 225.5 mm x 330 mm)435 mm x 161 mm x 327 mm (with antenna: 435 mm x 221 mm x 327 mm)
17-1/8" x 6-3/8" x 12-7/8" (with antenna up: 17-1/8" x 8-3/4" x 12-7/8")
Weight8.3 kg (18.3 lbs)8.1 kg (17.9 lbs)
Warranty3 Years3 Years
SPECS Yamaha Aventage RX-A660 Yamaha Aventage RX-A550
Power Output (6 Ω, 1 kHz, 1 channel driven, FTC)115 W (0.9% THD)115 W (0.9% THD)
Maximum Effective Power Output (6 Ω, 1 kHz, 1 channel driven, JEITA)135 W (10% THD)135 W (10% THD)
Dynamic Power per Channel (2190 W160 W
Dynamic Power per Channel (4 Ω, Front)170 W130 W
Dynamic Power per Channel (6 Ω, Front)140 W110 W
Damping Factor100 (Front, 20 Hz - 20 kHz, 8 Ω)100 (Front, 20 Hz - 20 kHz, 8 Ω)
Input Sensitivity and Impedance (Line)200 mV/47 kΩ (1 kHz, 100 W/6 Ω)200 mV/47 kΩ (1 kHz, 100 W/6 Ω)
Maximum Input Sensitivity (Line)2.3 V (1 kHz, 0.5% THD)2.3 V
Rated Headphone Jack Output Level and Impedance100 mV/470 Ω (1 kHz, 50 mV, 8 Ω)100 mV/560 Ω (AV 4 etc., 1 kHz, 50 mV, 8 Ω)
S/N Ratio (Line, IHF-A)110 dB110 dB
Frequency Response (Analog In)+0/-3 dB (10 Hz to 100 kHz)+0/-3 dB (10 Hz to 100 kHz)
Residual Noise (IHF-A Network)150 µV (Speaker Out)150 µV (Speaker Out)
Channel Separation at 1 kHz/10 kHz (LINE)75 dB/50 dB75 dB/50 dB
DSD Sampling Rates via HDMI2.8 MHz2.8 MHz
DSD Sampling Rates via USB5.6 MHz, 2.8 MHz5.6 MHz, 2.8 MHz
Video Input Sensitivity/Output Level and Impedance1 Vp-p/75 Ω (Composite)1 Vp-p/75 Ω (Component Y)
0.7 Vp-p/75 Ω (Component PB/CB, PR/CR)
1 Vp-p/75 Ω (Composite)
Video Maximum Input1.5 Vp-p1.5 Vp-p
Video S/N Ratio50 dB50 dB
Ethernet Standard10BASE-T/100BASE-TX10BASE-T/100BASE-TX
Wi-Fi StandardIEEE 802.11 b/g/nIEEE 802.11 b/g/n
Wi-Fi Terminal Frequency2.4 GHz2.4 GHz
Bluetooth Version2.1 + EDR2.1 + EDR
USB TerminalUSB2.0 5 V, 1 AUSB2.0 5 V, 1 A
FM Frequency87.50 MHz - 108.00 MHz87.50 MHz - 108.00 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)Mono: 3 µV (20.8 dBf)Mono: 3 µV (20.8 dBf)
FM S/N RatioMono/Stereo: 65 dB/64 dBMono/Stereo: 65 dB/64 dB
FM Harmonic Distortion (IHF, 1 kHz)Mono/Stereo: 0.5%/0.6%Mono/Stereo: 0.5%/0.6%
AM Frequency531 kHz - 1611 kHz531 MHz - 1611 MHz

* - 480i/576i and 480p/576p only
** - 480i/576i only
*** - no 1080p/24 upconversion
**** - 1080p signal is not converted

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