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Vizio M Series M51ax-J6 vs M Series M215a-J6

Which Soundbar Is Better?

    Top
    Main Differences
    Design
      Style - BarStyle - SubwooferStyle - SatellitesDimensions - BarDimensions - SubwooferDimensions - SatellitesMountingBuild QualityIn The BoxBack - BarBack - SubwooferBack - Satellites
    Sound
      Stereo Frequency ResponseStereo Frequency Response With Preliminary CalibrationStereo SoundstageStereo DynamicsStereo Total Harmonic DistortionCenterSurround 5.1Height (Atmos)Sound Enhancement Features
    Connectivity
      Inputs/Outputs - BarAudio Format Support: ARC/eARCAudio Format Support: HDMI InAudio Format Support: OpticalAudio Latency: ARCAudio Latency: HDMI InAudio Latency: OpticalVideo Passthrough To TVWireless PlaybackConnectivity - SubwooferConnectivity - Satellites
    Additional Features
      InterfaceBar ControlsRemoteVoice Assistants SupportAppOther Features
    Comments

Products

Vizio M Series M51ax-J6
Vizio M Series M215a-J6

Tested using Methodology v1.3

Updated Jan 06, 2026 09:22 PM

SEE PRICE
Amazon.com

Tested using Methodology v1.0

Updated Sep 04, 2024 08:55 PM

SEE PRICE
Amazon.com
Vizio M Series M51ax-J6 Picture
Vizio M Series M215a-J6 Picture
Channels
Locked
Channels
Locked

Our Verdict

Vizio M Series M51ax-J6

Vizio M Series M215a-J6

The Vizio M Series M51ax-J6 is better than the Vizio M Series M215a-J6. They're both 2021 models from the manufacturer, but the M51ax-J6 is a 5.1 setup and comes with two rear satellites. As a result, it performs much better with surround and Atmos content, and it has a center channel to improve vocal clarity. It's pricier than the M215a-J6, so if you mostly listen to music, you may want to stick with the cheaper model. However, the M51ax-J6 is a more versatile soundbar.

0 

Variants

  • M Series M51ax-J6 (Dark Charcoal)
  • M215a-J6 (Black)

Review

See Vizio M Series M51ax-J6 Review
See Vizio M Series M215a-J6 Review
8 
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Check Price

Dark Charcoal
M Series M51ax-J6
SEE PRICE
Amazon.com
Black
M215a-J6
SEE PRICE
Amazon.com
Dark Charcoal
M Series M51ax-J6
SEARCH
B&H
Black
M215a-J6
SEE PRICE
BestBuy.com
Dark Charcoal
M Series M51ax-J6
SEARCH
BestBuy.com
Black
M215a-J6
SEE PRICE
Walmart.com
Dark Charcoal
M Series M51ax-J6
SEARCH
Vizio
Black
M215a-J6
SEARCH
B&H
Dark Charcoal
M Series M51ax-J6
SEARCH
Walmart.com
Black
M215a-J6
SEARCH
Vizio
Read more

Main Differences for
Mixed Usage

Threshold 

0.10

Mixed Usage 
 

0.0
0.0
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Full Comparison

Design

Style - Bar  

Style photo - bar 
 

Vizio M Series M51ax-J6 Style photo - bar Sample

SAMPLE

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Vizio M Series M215a-J6 Style photo - bar Sample

SAMPLE

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Show Text 

Style - Subwoofer  

Style photo - sub 
 

Vizio M Series M51ax-J6 Style photo - sub Sample

SAMPLE

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Vizio M Series M215a-J6 Style photo - sub Sample

SAMPLE

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Sub Wireless 
 

Locked
Locked

Enclosure 
 

Locked
Locked
Show Text 

Style - Satellites  

Style photo - satellites 
 

Vizio M Series M51ax-J6 Style photo - satellites Sample

SAMPLE

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Vizio M Series M215a-J6 Style photo - satellites Sample

SAMPLE

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Satellite Wireless 
 

Locked
Locked
Show Text 

Dimensions - Bar  

Dimensions photo - bar 
 

Vizio M Series M51ax-J6 Dimensions photo - bar Sample

SAMPLE

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Vizio M Series M215a-J6 Dimensions photo - bar Sample

SAMPLE

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Width  

Lock" (Lock cm)
Lock" (Lock cm)

Height  

Lock" (Lock cm)
Lock" (Lock cm)

Depth  

Lock" (Lock cm)
Lock" (Lock cm)
Show Text 

Dimensions - Subwoofer  

Dimensions photo - sub 
 

Vizio M Series M51ax-J6 Dimensions photo - sub Sample

SAMPLE

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Vizio M Series M215a-J6 Dimensions photo - sub Sample

SAMPLE

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Width  

Lock" (Lock cm)
Lock" (Lock cm)

Height  

Lock" (Lock cm)
Lock" (Lock cm)

Depth  

Lock" (Lock cm)
Lock" (Lock cm)
Show Text 

Dimensions - Satellites  

Dimensions photo - satellites 
 

Vizio M Series M51ax-J6 Dimensions photo - satellites Sample

SAMPLE

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Vizio M Series M215a-J6 Dimensions photo - satellites Sample

SAMPLE

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Width  

Lock" (Lock cm)
N/A

Height  

Lock" (Lock cm)
N/A

Depth  

Lock" (Lock cm)
N/A
Show Text 

Mounting 
 

Bar Mounting Holes  

Vizio M Series M51ax-J6 Bar Mounting Holes Sample

SAMPLE

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Vizio M Series M215a-J6 Bar Mounting Holes Sample

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Satellite Mounting Holes  

Vizio M Series M51ax-J6 Satellite Mounting Holes Sample

SAMPLE

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Vizio M Series M215a-J6 Satellite Mounting Holes Sample

SAMPLE

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Mountable Bar 
 

Locked

Bar Brackets Included 
 

Locked

Mountable Satellites 
 

Locked

Satellite Brackets Included 
 

Locked

Build Quality 
 

N/A
N/A

Build quality photo 
 

Vizio M Series M51ax-J6 Build quality photo Sample

SAMPLE

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Vizio M Series M215a-J6 Build quality photo Sample

SAMPLE

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Show Text 

In The Box 
 

In The Box photo  
 

Vizio M Series M51ax-J6 In The Box photo Sample

SAMPLE

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Vizio M Series M215a-J6 In The Box photo Sample

SAMPLE

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HDMI Cable Length 
 

Lock m (Lock ft)

Digital Optical Cable Length 
 

Lock m (Lock ft)
Show Text 

Back - Bar  

Back photo - bar  

Vizio M Series M51ax-J6 Back photo - bar Sample

SAMPLE

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Vizio M Series M215a-J6 Back photo - bar Sample

SAMPLE

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Bar Mounting 
 

Locked
Show Text 

Back - Subwoofer  

Back photo - sub  

Vizio M Series M51ax-J6 Back photo - sub Sample

SAMPLE

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Vizio M Series M215a-J6 Back photo - sub Sample

SAMPLE

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Enclosure 
 

Locked
Locked
Show Text 

Back - Satellites  

Back photo - satellites  

Vizio M Series M51ax-J6 Back photo - satellites Sample

SAMPLE

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Vizio M Series M215a-J6 Back photo - satellites Sample

SAMPLE

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Mounting 
 

Locked
Sound

Stereo Frequency Response 
 

N/A
N/A

Stereo Setup 
 

Vizio M Series M51ax-J6 Stereo Setup Sample

SAMPLE

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Vizio M Series M215a-J6 Stereo Setup Sample

SAMPLE

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Raw Frequency Response  

Vizio M Series M51ax-J6 Raw Frequency Response Sample

SAMPLE

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Vizio M Series M215a-J6 Raw Frequency Response Sample

SAMPLE

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Frequency Response Small  

Vizio M Series M51ax-J6 Frequency Response Small Sample

SAMPLE

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Vizio M Series M215a-J6 Frequency Response Small Sample

SAMPLE

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Channels 
 

Locked
Locked

Tested Preset 
 

Locked
Locked

Slope 
 

Lock
Lock

Standard Error 
 

Lock dB
Lock dB

Low-Frequency Extension 
 

Lock Hz
Lock Hz

High-Frequency Extension 
 

Lock kHz
Lock kHz
Show Text 

Stereo Frequency Response With Preliminary Calibration 
 

N/A
N/A

Frequency Response Calibrated  

Vizio M Series M51ax-J6 Frequency Response Calibrated Sample

SAMPLE

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Vizio M Series M215a-J6 Frequency Response Calibrated Sample

SAMPLE

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Suggested Preset 
 

Locked
Locked

Suggested Bass Setting 
 

Lock
Lock

Suggested Treble Setting 
 

Lock
Lock

Slope 
 

Lock
Lock

Standard Error 
 

Lock dB
Lock dB

Low-Frequency Extension 
 

Lock Hz
Lock Hz

High-Frequency Extension 
 

Lock kHz
Lock kHz
Show Text 

Stereo Soundstage 
 

N/A
N/A

Crosstalk  

Vizio M Series M51ax-J6 Crosstalk Sample

SAMPLE

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Vizio M Series M215a-J6 Crosstalk Sample

SAMPLE

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Crosstalk Error 
 

Lock dB
Lock dB
Show Text 

Stereo Dynamics 
 

N/A
N/A

Dynamic Range Compression  

Vizio M Series M51ax-J6 Dynamic Range Compression Sample

SAMPLE

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Vizio M Series M215a-J6 Dynamic Range Compression Sample

SAMPLE

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SPL @ Max Volume 
 

Lock dB SPL
Lock dB SPL

DRC @ 90dB 
 

Lock dB

DRC @ Max Volume 
 

Lock dB
Lock dB
Show Text 

Stereo Total Harmonic Distortion 
 

N/A
N/A

THD  

Vizio M Series M51ax-J6 THD Sample

SAMPLE

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Vizio M Series M215a-J6 THD Sample

SAMPLE

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Weighted THD @ 80dB 
 

Lock

Weighted THD @ Max Volume 
 

Lock
Show Text 

Center 
 

N/A
N/A

Center Setup 
 

Vizio M Series M51ax-J6 Center Setup Sample

SAMPLE

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Vizio M Series M215a-J6 Center Setup Sample

SAMPLE

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Frequency Response  

Vizio M Series M51ax-J6 Frequency Response Sample

SAMPLE

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To see pictures and test results

Vizio M Series M215a-J6 Frequency Response Sample

SAMPLE

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To see pictures and test results

Localization 
 

Locked
Locked

Slope 
 

Lock
Lock

Std. Err. 
 

Lock dB
Lock dB

SPL @ Max Volume 
 

Lock dB SPL
Lock dB SPL

Weighted THD @ 80dB 
 

Lock
Lock

Weighted THD @ Max Volume 
 

Lock
Lock
Show Text 

Surround 5.1 
 

N/A
N/A

Surround Setup 
 

Vizio M Series M51ax-J6 Surround Setup Sample

SAMPLE

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Vizio M Series M215a-J6 Surround Setup Sample

SAMPLE

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Frequency Response  

Vizio M Series M51ax-J6 Frequency Response Sample

SAMPLE

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To see pictures and test results

Vizio M Series M215a-J6 Frequency Response Sample

SAMPLE

GET INSIDER ACCESS

To see pictures and test results

Localization 
 

Locked
Locked

Slope 
 

Lock
Lock

Std. Err. 
 

Lock dB
Lock dB

SPL @ Max Volume 
 

Lock dB SPL
Lock dB SPL

Weighted THD @ 80dB 
 

Lock
Lock

Weighted THD @ Max Volume 
 

Lock
Lock

7.1 Rears 
 

Locked
Locked
Show Text 

Height (Atmos) 
 

N/A
N/A

Height Setup 
 

Vizio M Series M51ax-J6 Height Setup Sample

SAMPLE

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Vizio M Series M215a-J6 Height Setup Sample

SAMPLE

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To see pictures and test results

H Frequency Response  

Vizio M Series M51ax-J6 H Frequency Response Sample

SAMPLE

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Vizio M Series M215a-J6 H Frequency Response Sample

SAMPLE

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To see pictures and test results

Localization 
 

Locked
Locked

Slope 
 

Lock
Lock

Std. Err. 
 

Lock dB
Lock dB

SPL @ Max Volume 
 

Lock dB SPL
Lock dB SPL

Weighted THD @ 80dB 
 

Lock
Lock

Weighted THD @ Max Volume 
 

Lock
Lock
Show Text 

Sound Enhancement Features 
 

N/A
N/A

Room Correction 
 

Locked
Locked

Dialogue Enhancement 
 

Locked
Locked

Auto-Volume/Night Mode 
 

Locked
Locked

Subwoofer Level Adjustment 
 

Locked
Locked

Bass Adjustment 
 

Locked
Locked

Treble Adjustment 
 

Locked
Locked

EQ 
 

Locked
Locked

Surround Level Adjustment 
 

Locked
Locked

Rear Level Adjustment 
 

Locked
Locked

Height Level Adjustment 
 

Locked
Locked

Virtual Surround 
 

Locked
Locked
Show Text 
Connectivity

Inputs/Outputs - Bar 
 

Physical Connections Bar Photo 1 
 

Vizio M Series M51ax-J6 Physical Connections Bar Photo 1 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical Connections Bar Photo 1 Sample

SAMPLE

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Physical Connections Bar Photo 2 
 

Vizio M Series M51ax-J6 Physical Connections Bar Photo 2 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical Connections Bar Photo 2 Sample

SAMPLE

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Optical Audio In 
 

Locked
Locked

HDMI Out 
 

Locked
Locked

HDMI 2.1 Class Bandwidth 
 

Locked

Full HDMI In 
 

Locked
Locked

Analog Audio In 3.5mm (Aux) 
 

Locked
Locked

RCA In 
 

Locked
Locked

USB for Files 
 

Locked
Locked

Ethernet 
 

Locked
Locked

Subwoofer Output 
 

Locked

HDMI ARC 
 

Locked
Show Text 

Audio Format Support: ARC/eARC 
 

N/A
N/A

Dolby Atmos 
 

Locked
Locked

Dolby Digital 
 

Locked
Locked

Dolby Digital Plus 
 

Locked
Locked

Dolby TrueHD 
 

Locked
Locked

DTS 
 

Locked
Locked

DTS:X 
 

Locked
Locked

eARC 
 

Locked

DTS-HD MA 
 

Locked
Locked

PCM Channels 
 

Locked

5.1 PCM (eARC only) 
 

Locked
Show Text 

Audio Format Support: HDMI In 
 

N/A
N/A

Dolby Atmos 
 

Locked
Locked

Dolby Digital 
 

Locked
Locked

Dolby Digital Plus 
 

Locked
Locked

Dolby TrueHD 
 

Locked
Locked

DTS 
 

Locked
Locked

DTS:X 
 

Locked
Locked

DTS-HD MA 
 

Locked
Locked

PCM Channels 
 

Locked

5.1 PCM 
 

Locked
Show Text 

Audio Format Support: Optical 
 

N/A
N/A

Dolby Digital 
 

Locked
Locked

DTS 
 

Locked
Locked

PCM Channels 
 

Locked
Show Text 

Audio Latency: ARC 
 

N/A
N/A

ARC Latency Video  

Vizio M Series M51ax-J6 ARC Latency Video Sample

SAMPLE

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Vizio M Series M215a-J6 ARC Latency Video Sample

SAMPLE

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PCM-2.0 ch 
 

Lock ms

PCM-5.1 ch 
 

Lock ms

Dolby MAT (PCM) Atmos 
 

Lock ms

Dolby Digital 
 

Lock ms

Dolby Digital Plus 
 

Lock ms

Dolby Digital Plus Atmos 
 

Lock ms
Show Text 

Audio Latency: HDMI In 
 

N/A
N/A

HDMI Latency Video  

Vizio M Series M51ax-J6 HDMI Latency Video Sample

SAMPLE

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Vizio M Series M215a-J6 HDMI Latency Video Sample

SAMPLE

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Latency Video  

Vizio M Series M51ax-J6 Latency Video Sample

SAMPLE

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Vizio M Series M215a-J6 Latency Video Sample

SAMPLE

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PCM-2.0 ch 
 

Lock ms

PCM-5.1 ch 
 

Lock ms

Dolby MAT (PCM) Atmos 
 

Lock ms

Dolby Digital 
 

Lock ms

Dolby Digital Plus 
 

Lock ms

Dolby Digital Plus Atmos 
 

Lock ms

ARC 
 

Lock ms

Optical 
 

Lock ms

Full HDMI In 
 

Lock ms
Show Text 

Audio Latency: Optical 
 

N/A
N/A

Optical Latency Video  

Vizio M Series M51ax-J6 Optical Latency Video Sample

SAMPLE

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Vizio M Series M215a-J6 Optical Latency Video Sample

SAMPLE

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To see product videos

PCM-2.0 ch 
 

Lock ms

Dolby Digital 
 

Lock ms
Show Text 

Video Passthrough To TV 
 

N/A
N/A

1080p Max Refresh Rate 
 

Locked

1080p @ 4:4:4 Max Refresh Rate 
 

Locked

4k Max Refresh Rate 
 

Locked

4k @ 120Hz @ 10-Bit 
 

Locked

4k @ 4:4:4 Max Refresh Rate 
 

Locked

8k Max Refresh Rate 
 

Locked

HDR10 Passthrough 
 

Locked
Locked

HDR10+ Passthrough 
 

Locked

Dolby Vision Passthrough 
 

Locked

HDMI Forum VRR Passthrough 
 

Locked

4k @ 60 Hz Passthrough 
 

Locked

FreeSync Passthrough 
 

Locked

G-SYNC Passthrough 
 

Locked

ALLM Passthrough 
 

Locked

4k @ 60 Hz @ 10 bit Passthrough 
 

Locked

4k @ 60 Hz @ 4:4:4 Passthrough 
 

Locked
Show Text 

Wireless Playback 
 

N/A
N/A

Bluetooth 
 

Locked
Locked

Wi-Fi Playback 
 

Locked
Locked

Chromecast built-in 
 

Locked
Locked

Apple AirPlay 
 

Locked
Locked

Spotify Connect 
 

Locked
Show Text 

Connectivity - Subwoofer 
 

Physical inputs subwoofer photo 1  

Vizio M Series M51ax-J6 Physical inputs subwoofer photo 1 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical inputs subwoofer photo 1 Sample

SAMPLE

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Physical controls subwoofer photo 1  

Vizio M Series M51ax-J6 Physical controls subwoofer photo 1 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical controls subwoofer photo 1 Sample

SAMPLE

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Sub Wireless 
 

Locked
Locked
Show Text 

Connectivity - Satellites 
 

Physical inputs satellites photo 1  

Vizio M Series M51ax-J6 Physical inputs satellites photo 1 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical inputs satellites photo 1 Sample

SAMPLE

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Physical controls satellites photo 1  

Vizio M Series M51ax-J6 Physical controls satellites photo 1 Sample

SAMPLE

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Vizio M Series M215a-J6 Physical controls satellites photo 1 Sample

SAMPLE

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Sat Wireless 
 

Locked
Locked
Additional Features

Interface 
 

Interface photo 
 

Vizio M Series M51ax-J6 Interface photo Sample

SAMPLE

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Vizio M Series M215a-J6 Interface photo Sample

SAMPLE

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Display 
 

Locked
Locked
Show Text 

Bar Controls 
 

Controls photo 
 

Vizio M Series M51ax-J6 Controls photo Sample

SAMPLE

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Vizio M Series M215a-J6 Controls photo Sample

SAMPLE

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Show Text 

Remote  

Remote photo 
 

Vizio M Series M51ax-J6 Remote photo Sample

SAMPLE

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Vizio M Series M215a-J6 Remote photo Sample

SAMPLE

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Universal Remote 
 

Locked
Show Text 

Voice Assistants Support 
 

Amazon Alexa 
 

Locked
Locked

Google Assistant 
 

Locked
Locked

Apple Siri 
 

Locked
Locked

Microphone Mute 
 

Locked
Show Text 

App 
 

App image  

Vizio M Series M51ax-J6 App image Sample

SAMPLE

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Vizio M Series M215a-J6 App image Sample

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App Name  

Locked

iOS  

Locked

Android  

Locked

Acts As A Remote 
 

Locked

Controls Soundbar's Settings 
 

Locked

Casts Device Files 
 

Locked

Other Features 
 

Power Saving 
 

Locked

HDMI CEC (TV Remote Control) 
 

Locked
Show Text 

Check Price

Dark Charcoal
M Series M51ax-J6
SEE PRICE
Amazon.com
Black
M215a-J6
SEE PRICE
Amazon.com
Dark Charcoal
M Series M51ax-J6
SEARCH
B&H
Black
M215a-J6
SEE PRICE
BestBuy.com
Dark Charcoal
M Series M51ax-J6
SEARCH
BestBuy.com
Black
M215a-J6
SEE PRICE
Walmart.com
Dark Charcoal
M Series M51ax-J6
SEARCH
Vizio
Black
M215a-J6
SEARCH
B&H
Dark Charcoal
M Series M51ax-J6
SEARCH
Walmart.com
Black
M215a-J6
SEARCH
Vizio
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Vizio M Series M51ax-J6

Vizio M Series M215a-J6

Comments

  1. Comparison
 • Posted 1 year ago

Vizio M Series M51ax-J6 vs Vizio M Series M215a-J6: Main Discussion

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