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Vizio V Series V51-H6 vs Vizio V Series V21-H8
Side-by-Side Comparison
Products
Vizio V Series V51-H6
Vizio V Series V21-H8
Tested using Methodology v1.3
Updated Oct 24, 2024 02:30 PM
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Amazon.comTested using Methodology v1.2
Updated Apr 17, 2024 02:36 PM
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Amazon.com
Channels5.1
Channels2.1
Variants
- V Series V51-H6 (Black)
- V21 H8 (Black)
- V21 H8R (Black)
Our Verdict
Vizio V Series V51-H6
Vizio V Series V21-H8
The Vizio V Series V51-H6 is a better soundbar than the Vizio V Series V21-H8. The V51-H6 is a 5.1 setup that has dedicated satellite speakers, unlike the 2.1 V21-H8. It also has a better-balanced, more neutral sound profile.
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Black
V Series V51-H6
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Amazon.comBlack
V21 H8
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V Series V51-H6
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BestBuy.comBlack
V21 H8R
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V Series V51-H6
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Walmart.comNotice: Two or more of the products selected have been tested with different test methodologies, so some of the results below aren't directly comparable.
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soundbars test methodology.
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Main Differences forMixed Usage
Mixed Usage
Threshold
Mixed Usage
7.4
7.0
Surround 5.1
7.0
3.9
Center
8.1
6.4
Stereo Dynamics
8.6
7.5
Full Comparison
Design
Style - Bar
Style photo - bar
Style - Subwoofer
Style photo - sub
Sub Wireless
Yes
Yes
Enclosure
Ported
Ported
Style - Satellites
Style photo - satellites
Satellite Wireless
Partial, wired to wireless sub
No
Dimensions - Bar
Dimensions photo - bar
Width
36.0" (91.5 cm)
36.0" (91.5 cm)
Height
2.2" (5.7 cm)
2.3" (5.8 cm)
Depth
3.2" (8.2 cm)
3.2" (8.2 cm)
Dimensions - Subwoofer
Dimensions photo - sub
Width
8.3" (21.2 cm)
8.3" (21.2 cm)
Height
9.8" (25.0 cm)
9.8" (25.0 cm)
Depth
8.3" (21.2 cm)
8.3" (21.2 cm)
Dimensions - Satellites
Dimensions photo - satellites
Width
4.8" (12.1 cm)
N/A
Height
2.2" (5.7 cm)
N/A
Depth
3.2" (8.2 cm)
N/A
Mounting
Bar Mounting Holes
Satellite Mounting Holes
Mountable Bar
Yes
Yes
Bar Brackets Included
Yes
Yes
Mountable Satellites
Yes
No
Satellite Brackets Included
Yes
No
Build Quality
7.0
7.0
Build quality photo
In The Box
In The Box photo
Sound
Stereo Frequency Response
7.6
7.6
Stereo Setup
Raw Frequency Response
Frequency Response Small
Channels
5.1
2.1
Tested Preset
Direct
Music
Slope
-0.66
-0.86
Standard Error
3.28 dB
4.28 dB
Low-Frequency Extension
40.0 Hz
34.1 Hz
High-Frequency Extension
19.9 kHz
16.5 kHz
Stereo Frequency Response With Preliminary Calibration
7.7
7.5
Frequency Response Calibrated
Suggested Preset
Direct
Music
Suggested Bass Setting
-3
-4
Suggested Treble Setting
1
0
Slope
0.07
-0.09
Standard Error
2.76 dB
2.81 dB
Low-Frequency Extension
43.0 Hz
43.0 Hz
High-Frequency Extension
19.9 kHz
16.0 kHz
Stereo Soundstage
7.0
7.0
Crosstalk Error
2.14 dB
2.99 dB
Stereo Dynamics
8.6
7.5
Dynamic Range Compression
SPL @ Max Volume
95.3 dB SPL
95.8 dB SPL
DRC @ 90dB
0.21 dB
DRC @ Max Volume
0.97 dB
2.88 dB
Stereo Total Harmonic Distortion
7.7
Weighted THD @ 80dB
0.45
Weighted THD @ Max Volume
1.78
Center
8.1
6.4
Center Setup
Frequency Response
Localization
Discrete
Phantom
Slope
-0.81
-0.83
Std. Err.
3.42 dB
4.33 dB
SPL @ Max Volume
91.1 dB SPL
95.8 dB SPL
Weighted THD @ 80dB
0.63
0.43
Weighted THD @ Max Volume
1.68
1.79
Surround 5.1
7.0
3.9
Surround Setup
Frequency Response
Localization
Discrete
Stereo (Downmix)
Slope
-1.86
0.79
Std. Err.
4.85 dB
3.62 dB
SPL @ Max Volume
90.2 dB SPL
88.2 dB SPL
Weighted THD @ 80dB
0.87
0.90
Weighted THD @ Max Volume
2.61
3.51
7.1 Rears
No
No
Height (Atmos)
0.0
0.0
Height Setup
H Frequency Response
Localization
Not Supported
Not Supported
Slope
N/A
N/A
Std. Err.
N/A
N/A
SPL @ Max Volume
N/A
N/A
Weighted THD @ 80dB
N/A
N/A
Weighted THD @ Max Volume
N/A
N/A
Sound Enhancement Features
7.1
6.8
Room Correction
No
No
Dialogue Enhancement
Yes
Yes
Auto-Volume/Night Mode
Yes
Yes
Subwoofer Level Adjustment
Yes
Yes
Bass Adjustment
Yes
Yes
Treble Adjustment
Yes
Yes
EQ
Presets
Presets
Surround Level Adjustment
Yes
No
Rear Level Adjustment
No
No
Height Level Adjustment
No
No
Virtual Surround
Yes
Yes
Connectivity
Inputs/Outputs - Bar
Physical Connections Bar Photo 1
Physical Connections Bar Photo 2
Optical Audio In
1
1
HDMI Out
ARC
ARC
HDMI 2.1 Class Bandwidth
No
No
Full HDMI In
No
No
Analog Audio In 3.5mm (Aux)
1
1
RCA In
No
No
USB for Files
1
1
Ethernet
No
No
Subwoofer Output
No
No
Audio Format Support: ARC/eARC
6.3
6.3
Dolby Atmos
Not Supported
Not Supported
Dolby Digital
Supported
Supported
Dolby Digital Plus
Not Supported
Not Supported
Dolby TrueHD
Not Supported
Not Supported
DTS
Supported
Supported
DTS:X
Not Supported
Not Supported
DTS-HD MA
Not Supported
Not Supported
PCM Channels
2.0
2.0
Audio Format Support: HDMI In
0.0
0.0
Dolby Atmos
Not Supported
Not Supported
Dolby Digital
Not Supported
Not Supported
Dolby Digital Plus
Not Supported
Not Supported
Dolby TrueHD
Not Supported
Not Supported
DTS
Not Supported
Not Supported
DTS:X
Not Supported
Not Supported
DTS-HD MA
Not Supported
Not Supported
PCM Channels
Not Supported
Not Supported
Audio Format Support: Optical
10
10
Dolby Digital
Supported
Supported
DTS
Supported
Supported
PCM Channels
2.0
2.0
Audio Latency: ARC
7.3
ARC Latency Video
PCM-2.0 ch
N/A
PCM-5.1 ch
N/A
Dolby MAT (PCM) Atmos
N/A
Dolby Digital
109 ms
Dolby Digital Plus
N/A
Dolby Digital Plus Atmos
N/A
Audio Latency: HDMI In
0.0
8.1
HDMI Latency Video
Latency Video
PCM-2.0 ch
N/A
PCM-5.1 ch
N/A
Dolby MAT (PCM) Atmos
N/A
Dolby Digital
N/A
Dolby Digital Plus
N/A
Dolby Digital Plus Atmos
N/A
ARC
59 ms
Optical
52 ms
Full HDMI In
N/A
Audio Latency: Optical
6.9
Optical Latency Video
PCM-2.0 ch
N/A
Dolby Digital
366 ms
Video Passthrough To TV
0.0
0.0
1080p Max Refresh Rate
Not Supported
Not Supported
1080p @ 4:4:4 Max Refresh Rate
Not Supported
Not Supported
4k Max Refresh Rate
Not Supported
Not Supported
4k @ 120Hz @ 10-Bit
Not Supported
Not Supported
4k @ 4:4:4 Max Refresh Rate
Not Supported
Not Supported
8k Max Refresh Rate
Not Supported
Not Supported
HDR10 Passthrough
No
No
HDR10+ Passthrough
No
No
Dolby Vision Passthrough
No
No
HDMI Forum VRR Passthrough
No
No
FreeSync Passthrough
No
No
G-SYNC Passthrough
No
No
ALLM Passthrough
No
No
Wireless Playback
6.0
6.0
Bluetooth
Yes
Yes
Wi-Fi Playback
No
No
Chromecast built-in
No
No
Apple AirPlay
No
No
Spotify Connect
No
No
Additional Features
Interface
Interface photo
Display
No
No
Bar Controls
Controls photo
Remote
Remote photo
Voice Assistants Support
Amazon Alexa
No
No
Google Assistant
No
No
Apple Siri
No
No
Microphone Mute
No
No
Check Price
Black
V Series V51-H6
SEE PRICE
Amazon.comBlack
V21 H8
Searching
Finding storeBlack
V Series V51-H6
SEE PRICE
BestBuy.comBlack
V21 H8R
Searching
Finding storeBlack
V Series V51-H6
SEE PRICE
Walmart.com
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Vizio V Series V51-H6
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Vizio V Series V51-H6 vs Vizio V Series V21-H8: Main Discussion
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