Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550 Detailed Comparison

Yamaha Aventage RX-A660

Yamaha Aventage RX-A550

SCORE:
79
SCORE:
73

Highlights

  • 7.2 channels
  • 7.1 channel processing
  • 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

Highlights

  • 5.1 channels
  • 5.1 channel processing
  • 80 W (8 Ω, 20 Hz - 20 kHz, 2 channel driven)
  • 1080p Upscaling, 4K Passthrough
  • AirPlay, DLNA, MusicCast
  • Ethernet, Wi-Fi, Bluetooth
  • USB input

Disclosure: We earn money from the affiliate links to products associated with content in this article.

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.

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
73
RADIO
79
OVERALL
79
AMPLIFIER
80
VIDEO FEATURES
71
AUDIO FEATURES
71
CONNECTIVITY
81
MULTIZONE
55
MISCELLANEOUS
51
RADIO
84
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 vs Yamaha Aventage RX-A550
More Channels 7.2 vs 5.1
Bi-amp capability vs
More Channel Processing 7.1 vs 5.1
Dolby Atmos up to 5.1.2 vs
Dolby Surround Upmixer vs
DTS:X up to 5.1.2 vs
DTS Neural:X vs
DTS Dialog Control vs
Dialog Level Adjustment vs
Dialogue Lift no presence speakers required vs
HDR10 vs
BT.2020 color space vs
Zone B Video Output vs
More Speaker Terminals 7 vs 5
More Large Speaker Terminals 7 vs 5
Universal Power Supply AC 110-120/220-240 V, 50/60 Hz vs AC 120 V, 60 Hz
Higher Dynamic Power per Channel, 2 Ω, Front) 190 W vs 180 W
Higher Dynamic Power per Channel, 4 Ω, Front) 170 W vs 160 W
Higher Dynamic Power per Channel, 6 Ω, Front) 140 W vs 130 W
Higher Dynamic Power per Channel, 8 Ω, Front) [a] vs 110 W

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

Common Strengths and Weaknesses

Here we list common strengths and weaknesses of both receivers.

PROS
👍   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
CONS
👍   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 Tidal
👍   No Deezer
👍   No Napster
👍   No SiriusXM Internet Radio
👍   Old Bluetooth Version

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 AirPlay. It has 4 HDMI inputs with HDCP 2.2 copy protection.

Front panel has USB and mini-jack Audio inputs.

Image cannot be found Image cannot be found

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 AirPlay. It has 6 HDMI inputs with HDCP 2.2 copy protection.

Front panel has USB and mini-jack inputs.

Image cannot be found Image cannot be found

Side by Side Comparison

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 vs Yamaha Aventage RX-A550
BrandYamahavsYamaha
SeriesAventagevsAventage
ModelRX-A660vsRX-A550
TypeA/V ReceivervsA/V Receiver
CountryBrazil and GeneralvsUSA and Canada
Release Year2016vs2015
AMPLIFIER Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Channels7.2vs5.1
THX™ Certificationvs
Continuous 6 Ω Ratedvs
Bi-amp Capabilityvs
AUDIO Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Surround:AI™vs
DACBurr-BrownvsBurr-Brown
Maximum Channel Processing7.1vs5.1
Air Studios Monitor Certificationvs
Dolby Atmos up to 5.1.2vs
Dolby Atmos Height Virtualizationvs
Dolby TrueHDvs
Dolby Digital Plusvs
Dolby Surround Upmixervs
Dolby Pro Logicvs PLII
Dolby Digital EXvs
DTS:X up to 5.1.2vs
DTS Neural:Xvs
DTS Virtual:Xvs
DTS Neo Neo:6vs Neo:6
DTS-HD Master Audiovs
DTS-HD High Resolution Audiovs
DTS 96/24vs
DTS Expressvs
DTS-ES Discrete 6.1, Matrix 6.1vs Discrete 6.1, Matrix 6.1
IMAX Enhancedvs
Auro 3D with Auro-Matic Upmixervs
PCM 2-ch/Multi-ch Inputvs 2-ch/Multi-ch Input
Music Playback via USBMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSDvsMP3, WMA, AAC, Apple Lossless, WAV, FLAC, AIFF, DSD
High Resolution Music Playback via USB and/or Network up to 192 kHzvs up to 192 kHz
High Resolution Audio Formats via USBApple Lossless, WAV, FLAC, AIFF, DSDvsApple Lossless, WAV, FLAC, AIFF, DSD
Multi-Channel Music File Playback via USBvs
Gapless Playbackvs
DSD via HDMI 2-ch/Multi-ch Inputvs 2-ch/Multi-ch Input
DSD via USB 2-ch Inputvs 2-ch Input
DSD to PCM Convertervs
USB DACvs
DTS Dialog Controlvs
Dialog Level Adjustmentvs
Dialog Normalizationvs
Dialogue Lift no presence speakers requiredvs
Compressed Music Enhancer including for Bluetooth®vs including for Bluetooth®
High-resolution Music Enhancervs
Adaptive DRC (Dynamic Range Control)vs
Initial Volume & Maximum Volume Settingvs
Audyssey Dynamic EQvs
Audyssey Dynamic Volumevs
Audyssey LFCvs
Audyssey Sub EQ HTvs
Audyssey DSXvs
Direct Modevs
Straight Decoding Modevs
CINEMA DSP 3Dvs 3D
DSP Programs17vs17
SILENT CINEMA / Virtual CINEMA DSP Virtual CINEMA FRONTvs Virtual CINEMA FRONT
Virtual Speakers including surround backvs
CALIBRATION Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Auto Speaker Calibration System with Mic. YPAO sound optimizationvs YPAO sound optimization
YPAO Volumevs
PEQ for SUBDown to 31 HzvsDown to 31 Hz
VIDEO Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Video Signal TypeNTSCvsNTSC
HDR10vs
HDR10+vs
BT.2020 color spacevs
Dolby Visionvs
HLG (Hybrid Log Gamma)vs
QMS (Quick Media Switching)vs
ALLM (Auto Low Latency Mode)vs
VRR (Variable Refresh Rate)vs
QFT (Quick Frame transport)vs
3-D Readyvs
Video Signal Passthroughup to 4K 60p 4:4:4vsup to 4K/60p 4:2:0
Video Signal Upscalingvs up to 1080p
Analog To HDMI Upconversionvs
Component Video Upscalingvs
Analog to Analog Video conversionvs
Video Parameter Adjustmentsvs
isf Certified Calibration Controlvs
CONNECTIVITY Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
MHL Inputvs
DLNA 1.5vs
FireConnectvs
FlareConnectvs
MusicCastvs
Chromecast Built-Invs
DTS Play-Fivs
Works with Amazon Alexa on MusicCast (Voice control using your Alexa device like Echo, Dot, Tap and Show)vs on MusicCast (Voice control using your Alexa device like Echo, Dot, Tap and Show)
Works with SONOSvs
AirPlay AirPlayvs AirPlay
Apple Product Connection iPod, iPhone and iPadvs iPod, iPhone and iPad
Remote App (iPhone® / iPad® / Android™ phone / tablet)vs (iPhone® / iPad® / Android™ phone / tablet)
InstaPrevue Input Source Prevuevs
Ethernetvs
Ethernet Switchvs
Wi-Fi with Wireless Directvs with Wireless Direct
Bluetooth SBC, AACvs
HDBaseT Compatiblevs
Enhanced ARCvs
HDCP Version2.2vs2.2
HDMI Input4vs6
HDMI Output1vs1
USB InputUSB memory, portable audio playervsiPod® / iPhone®, USB memory, portable audio player
USB DC Out Portvs
Analog Audio Line Input4 (1 front)vs4 (1 AUX Jack in the front)
Analog Audio Line Outputvs
Phono Inputvs
Optical In1vs1
Optical Outvs
Coaxial In/Out2 / vs2 /
Composite Video Input4vs4
Composite Video Output1vs1
S-Video Inputvs
S-Video Outputvs
Component Video Inputvs2
Component Video Outputvs1
PC Invs
Multi-Channel Inputvs
Analog Pre-Outs0.2vs0.1
XLR Inputsvs
XLR Pre-outsvs
Front A/V InputsUSB, mini-jack AudiovsUSB, mini-jack
Speaker A/Bvs
Headphone Out 6.3 mmvs 6.3 mm
ZONES Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Zones1vs1
Zone B Video Outputvs
RS-232vs
+12V Trigger Outputvs
Remote (IR) Input/Output0 / 0vs0 / 0
Party Modevs
MISC Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
On-Screen Display color OSDvs color OSD
SCENESCENE (4 sets)vsSCENE (4 sets)
Web Browser Controlvs
PreAmp Modevs
Remote Controllervs
Detachable Power Cordvs
dockportvs
RADIO Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Analog Tuner FM/AMvs FM/AM
Presets40vs40
Digital Radiovs
Internet Radio vTunervs vTuner
Pandoravs
Spotifyvs
Tidalvs
Deezervs
Napstervs
SiriusXM Internet Radiovs
CONSTRUCTION Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
A.R.T. Wedgevs
Speaker Terminals7vs5
Large Speaker Terminals7vs5
Color-Coded Speaker Terminalsvs
Gold plated RCA terminalsvs
POWER Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Power SupplyAC 110-120/220-240 V, 50/60 HzvsAC 120 V, 60 Hz
Power Consumption260 Wvs260 W
Standby Power0.1 Wvs0.1 W
GENERAL Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
ECO Mode / Hybrid Standby Functionvs
Auto Power Standbyvs
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)vs435 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)vs8.1 kg (17.9 lbs)
Warranty3 Yearsvs3 Years
SPECS Yamaha Aventage RX-A660 vs Yamaha Aventage RX-A550
Dynamic Power per Channel (2190 Wvs180 W
Dynamic Power per Channel (4 Ω, Front)170 Wvs160 W
Dynamic Power per Channel (6 Ω, Front)140 Wvs130 W
Damping Factor100 (Front, 20 Hz - 20 kHz, 8 Ω)vs100 (Front, 20 Hz - 20 kHz, 8 Ω)
Input Sensitivity and Impedance (Line)200 mV/47 kΩ (1 kHz, 100 W/6 Ω)vs200 mV/47 kΩ (1 kHz, 100 W/6 Ω)
Maximum Input Sensitivity (Line)2.3 V (1 kHz, 0.5% THD)vs2.3 V
Rated Headphone Jack Output Level and Impedance100 mV/470 Ω (1 kHz, 50 mV, 8 Ω)vs100 mV/560 Ω (AV 4 etc., 1 kHz, 50 mV, 8 Ω)
S/N Ratio (Line, IHF-A)110 dBvs110 dB
Frequency Response (Analog In)+0/-3 dB (10 Hz to 100 kHz)vs+0/-3 dB (10 Hz to 100 kHz)
Residual Noise (IHF-A Network)150 µV (Speaker Out)vs150 µV (Speaker Out)
Channel Separation at 1 kHz/10 kHz (LINE)75 dB/50 dBvs75 dB/50 dB
DSD Sampling Rates via HDMI2.8 MHzvs2.8 MHz
DSD Sampling Rates via USB5.6 MHz, 2.8 MHzvs5.6 MHz, 2.8 MHz
Video Input Sensitivity/Output Level and Impedance1 Vp-p/75 Ω (Composite)vs1 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-pvs1.5 Vp-p
Video S/N Ratio50 dBvs50 dB
Ethernet Standard10BASE-T/100BASE-TXvs10BASE-T/100BASE-TX
Wi-Fi StandardIEEE 802.11 b/g/nvsIEEE 802.11 b/g/n
Wi-Fi Terminal Frequency2.4 GHzvs2.4 GHz
Bluetooth Version2.1 + EDRvs2.1 + EDR
USB TerminalUSB2.0 5 V, 1 AvsUSB2.0 5 V, 1 A
FM Frequency87.5/87.50 MHz - 108.0/108.00 MHzvs87.5 MHz - 107.9 MHz
FM 50 dB Quiet Sensitivity (IHF, 1 kHz, 100% MOD.)Mono: 3 µV (20.8 dBf)vsMono: 3 µV (20.8 dBf)
FM S/N RatioMono/Stereo: 65 dB/64 dBvsMono/Stereo: 65 dB/64 dB
FM Harmonic Distortion (IHF, 1 kHz)Mono/Stereo: 0.5%/0.6%vsMono/Stereo: 0.5%/0.6%
AM Frequency530/531 kHz - 1710/1611 kHzvs530 MHz - 1710 MHz

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

Amazon Affiliate Disclosure

ZKelectronics is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon (.com, .co.uk, .ca, etc) and any other websites that may be affiliated with Amazon Service LLC Associates Program.