Products
TCL 6 Series/R648 2021 8k QLED
TCL 6 Series/R646 2021 QLED
Tested using Methodology v1.11
Updated Sep 24, 2025 06:36 PM
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Tested using Methodology v1.11
Updated Sep 24, 2025 06:38 PM
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Resolution8k
TypeLED
Sub-Type
VA
Resolution4k
TypeLED
Sub-Type
VA
Our Verdict
TCL 6 Series/R648 2021 8k QLED
TCL 6 Series/R646 2021 QLED
The TCL 6 Series/R648 2021 8k QLED and the TCL 6 Series/R646 2021 QLED are part of the same 6 Series lineup, but they're different TVs. The R648 is an 8k model with Roku TV, while the R646 is a 4k TV with Google built-in. They each have VA panels with high contrast, and even though their local dimming features are both decent, they perform differently. The one on the R648 crushes blacks with minimal blooming and the one on the R646 helps brighten highlights, but it doesn't improve the contrast with real content much. They both don't upscale 480p well, but that's because the R646 can't display the proper aspect ratio, and the R648 is just bad at it.
Variants
- 65R648 (65")
- 75R648 (75")
- 55R646 (55")
- 65R646 (65")
- 75R646 (75")
Check Price
55"
55"
55R646
SEE PRICE
Amazon.com
65"
65R648
SEE PRICE
Amazon.com
65"
65R646
SEE PRICE
Amazon.com
75"
75R648
SEE PRICE
Amazon.com
75"
75R646
SEE PRICE
Amazon.com
Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
7.9
8.0
Low-Quality Content Smoothing
5.6
8.1
Pre Calibration
8.9
7.5
Full Comparison
Design
Style
Design Picture
Curved
No
No
Accelerated Longevity Test
Uniformity Pictures
Month 30
50% Gray
Month 30
50% Gray
Longevity Graph
Stand
Stand Picture
Back
Back Picture
Wall Mount
VESA 400x400
VESA 300x300
Borders
Borders Picture
Borders
0.39" (1.0 cm)
0.35" (0.9 cm)
Thickness
Thickness Picture
Max Thickness
2.99" (7.6 cm)
3.66" (9.3 cm)
Build Quality
7.5
7.5
Build quality picture
Picture Quality
Contrast
8.9
8.9
Contrast Picture
Contrast
134,133 : 1
39,900 : 1
Native Contrast
3,065 : 1
7,778 : 1
Blooming
7.5
7.5
Blooming Photo
Lighting Zone Transitions
7.5
8.0
Preferred LD Video, Moving Object
Local Dimming
Yes
Yes
Backlight
Full-Array
Full-Array
Dimming Zones Count Of Tested TV
160
128
Contrast And Dark Details In Game Mode
8.0
8.5
Blooming Photo In Game Mode
Preferred LD Video, Moving Object In Game Mode
Game Transitions With VRR And Preferred LD
HDR Brightness
8.2
8.2
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
597 cd/m²
523 cd/m²
Yellow Skyscraper (~700 cd/m²)
353 cd/m²
377 cd/m²
Landscape Pool (~300 cd/m²)
255 cd/m²
240 cd/m²
Peak 2% Window
770 cd/m²
660 cd/m²
Peak 10% Window
1,067 cd/m²
1,051 cd/m²
Peak 25% Window
1,154 cd/m²
1,085 cd/m²
Peak 50% Window
817 cd/m²
872 cd/m²
Peak 100% Window
626 cd/m²
851 cd/m²
Sustained 2% Window
756 cd/m²
656 cd/m²
Sustained 10% Window
1,045 cd/m²
1,035 cd/m²
Sustained 25% Window
1,137 cd/m²
1,069 cd/m²
Sustained 50% Window
815 cd/m²
869 cd/m²
Sustained 100% Window
624 cd/m²
848 cd/m²
Automatic Brightness Limiting (ABL)
0.032
0.025
HDR Brightness In Game Mode
8.2
8.2
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
597 cd/m²
523 cd/m²
Yellow Skyscraper (~700 cd/m²)
348 cd/m²
393 cd/m²
Landscape Pool (~300 cd/m²)
256 cd/m²
232 cd/m²
Peak 2% Window
771 cd/m²
639 cd/m²
Peak 10% Window
1,069 cd/m²
1,038 cd/m²
Peak 25% Window
1,161 cd/m²
1,094 cd/m²
Peak 50% Window
824 cd/m²
886 cd/m²
Peak 100% Window
632 cd/m²
870 cd/m²
Sustained 2% Window
761 cd/m²
637 cd/m²
Sustained 10% Window
1,054 cd/m²
1,022 cd/m²
Sustained 25% Window
1,148 cd/m²
1,084 cd/m²
Sustained 50% Window
822 cd/m²
882 cd/m²
Sustained 100% Window
631 cd/m²
868 cd/m²
Automatic Brightness Limiting (ABL)
0.032
0.024
PQ EOTF Tracking
8.4
8.0
PQ EOTF Graph
600 Nit Tracking Delta
0.0102
0.0168
1000 Nit Tracking Delta
0.0104
0.0134
4000 Nit Tracking Delta
0.0105
0.0134
SDR Brightness
8.9
9.0
Real Scene Peak Brightness
687 cd/m²
800 cd/m²
Peak 2% Window
724 cd/m²
690 cd/m²
Peak 10% Window
1,039 cd/m²
1,027 cd/m²
Peak 25% Window
1,123 cd/m²
1,053 cd/m²
Peak 50% Window
795 cd/m²
836 cd/m²
Peak 100% Window
608 cd/m²
804 cd/m²
Sustained 2% Window
720 cd/m²
684 cd/m²
Sustained 10% Window
1,018 cd/m²
1,019 cd/m²
Sustained 25% Window
1,106 cd/m²
1,038 cd/m²
Sustained 50% Window
792 cd/m²
833 cd/m²
Sustained 100% Window
606 cd/m²
800 cd/m²
Automatic Brightness Limiting (ABL)
0.033
0.023
Color Gamut
8.6
8.3
Wide Color Gamut
Yes
Yes
Color Gamut DCI-P3 Picture
DCI P3 xy
90.95%
91.53%
DCI P3 uv
96.19%
96.50%
Color Gamut Rec.2020 Picture
Rec 2020 xy
75.03%
69.61%
Rec 2020 uv
82.71%
74.75%
Color Volume
8.3
7.9
P3 Color Volume ITP Picture
1,000 cd/m² DCI P3 Coverage ITP
77.1%
75.4%
2020 Color Volume ITP Picture
10,000 cd/m² Rec 2020 Coverage ITP
39.1%
34.5%
White Luminance
743 cd/m²
668 cd/m²
Red Luminance
156 cd/m²
160 cd/m²
Green Luminance
528 cd/m²
450 cd/m²
Blue Luminance
64 cd/m²
54 cd/m²
Cyan Luminance
592 cd/m²
501 cd/m²
Magenta Luminance
221 cd/m²
207 cd/m²
Yellow Luminance
683 cd/m²
616 cd/m²
Pre Calibration
8.9
7.5
Pre White Balance Picture
Pre Gamma Curve Picture
Pre Color Picture
White Balance dE
1.97
3.67
Color dE
0.96
2.51
Gamma
2.13
2.30
Color Temperature
6,513 K
6,239 K
Picture Mode
Movie
Movie
Color Temp Setting
Warm
Warm
Gamma Setting
2.2
2.2
Post Calibration
9.7
9.4
Post White Balance Picture
Post Gamma Curve Picture
Post Color Picture
White Balance dE
0.17
0.26
Color dE
0.57
1.46
Gamma
2.20
2.20
Color Temperature
6,503 K
6,512 K
White Balance Calibration
11 point
20 point
Color Calibration
Yes
No
Gray Uniformity
7.4
7.8
50% Uniformity Picture
50% Std. Dev.
1.286%
2.499%
50% DSE
0.202%
0.165%
5% Uniformity Picture
5% Std. Dev.
0.965%
0.983%
5% DSE
0.127%
0.102%
Black Uniformity
7.8
9.1
Black Uniformity Picture With Preferred Local Dimming
Std. Dev.
0.829%
0.471%
Native Black Uniformity Picture
Native Std. Dev.
1.509%
1.143%
Viewing Angle
5.2
5.4
Viewing Angle Video
Chroma Graph
Color Washout
21°
25°
Hue Graph
Color Shift
31°
33°
Lightness Graph
Brightness Loss
35°
30°
Black Level Raise
14°
13°
Gamma Shift
12°
21°
Reflections
8.4
8.5
Reflections Picture
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Semi-gloss
Semi-gloss
Total Reflections
3.2%
3.1%
Indirect Reflections
1.0%
0.6%
Calculated Direct Reflections
2.2%
2.5%
HDR Native Gradient
7.5
8.5
HDR Gradient Picture
100% Black to 50% Gray
4.0
6.0
50% Gray to 100% White
8.0
10
100% Black to 50% Red
8.0
8.0
50% Red to 100% Red
10
10
100% Black to 50% Green
6.0
8.0
50% Green to 100% Green
8.0
8.0
100% Black to 50% Blue
6.0
8.0
50% Blue to 100% Blue
10
10
Low-Quality Content Smoothing
5.6
8.1
Low-Quality Content Smoothing Picture
Smoothing
5.0
9.0
Detail Preservation
7.0
6.0
Upscaling: Sharpness Processing
4.0
3.0
Sharpness Picture - 480p
Pixels
Pixels Picture
Subpixel Layout
BGR
BGR
Type
LED
LED
Sub-Type
VA
VA
Motion
Response Time
8.6
8.4
Motion Blur Picture
Response Time Chart
80% Response Time
3.6 ms
3.9 ms
100% Response Time
9.5 ms
11.1 ms
Flicker-Free
9.9
9.9
Backlight chart
Flicker-Free
No
No
PWM Dimming Frequency
960 Hz
960 Hz
Black Frame Insertion (BFI)
BFI Picture
BFI Frequency Picture
Optional BFI
Yes
Yes
Min Flicker For 60 fps
60 Hz
120 Hz
60Hz For 60 fps
Yes
No
120Hz For 120 fps
Yes
Yes
Min Flicker for 60 fps in Game Mode
60 Hz
120 Hz
Motion Interpolation
Motion Interpolation (30 fps) Picture
Motion Interpolation (30 fps)
Yes
Yes
Motion Interpolation (60 fps) Picture
Motion Interpolation (60 fps)
Yes
Yes
Stutter
6.7
7.0
Frame Hold Time @ 24 fps
32.2 ms
30.6 ms
Frame Hold Time @ 60 fps
7.2 ms
5.6 ms
24p Judder
10
10
Judder-Free 24p
Yes
Yes
Judder-Free 24p via 60p
Yes
Yes
Judder-Free 24p via 60i
Yes
Yes
Judder-Free 24p via Native Apps
Yes
Yes
Variable Refresh Rate
9.4
7.7
Native Refresh Rate
120 Hz
120 Hz
Variable Refresh Rate
Yes
Yes
HDMI Forum VRR
Yes
Yes
FreeSync
Yes
Yes
G-SYNC Compatible
Yes
No
4k VRR Maximum
120 Hz
120 Hz
4k VRR Minimum
< 20 Hz
48 Hz
1080p VRR Maximum
120 Hz
120 Hz
1080p VRR Minimum
< 20 Hz
48 Hz
1440p VRR Maximum
120 Hz
120 Hz
1440p VRR Minimum
< 20 Hz
48 Hz
VRR + Local Dimming
Yes
Yes
Inputs
Input Lag
9.4
9.4
1080p @ 60Hz
15.3 ms
14.2 ms
1080p @ 60Hz Outside Game Mode
112.3 ms
138.8 ms
1080p @ 120Hz
6.3 ms
5.8 ms
1080p @ 144Hz
N/A
N/A
1440p @ 60Hz
15.2 ms
14.2 ms
1440p @ 120Hz
6.3 ms
5.8 ms
1440p @ 144Hz
N/A
N/A
4k @ 60Hz
15.1 ms
14.4 ms
4k @ 60Hz + 10-Bit HDR
15.2 ms
13.9 ms
4k @ 60Hz @ 4:4:4
15.1 ms
14.2 ms
4k @ 60Hz Outside Game Mode
110.6 ms
138.6 ms
4k @ 60Hz With Interpolation
103.9 ms
131.9 ms
4k @ 120Hz
6.2 ms
5.8 ms
4k @ 144Hz
N/A
N/A
8k @ 60Hz
15.2 ms
N/A
Supported Resolutions
10
9.3
Resolution
8k
4k
480p @ 59.94Hz (Widescreen)
Yes
Yes
720p @ 59.94Hz
Yes
Yes
1080p @ 60Hz @ 4:4:4
Yes
Yes
1080p @ 120Hz
Yes
Yes
1080p @ 144Hz
No
No
1440p @ 60Hz
Yes (forced resolution required)
Yes (forced resolution required)
1440p @ 120Hz
Yes
Yes
1440p @ 144Hz
No
No
4k @ 60Hz
Yes
Yes
4k @ 60Hz @ 4:4:4
Yes
Yes
4k @ 120Hz
Yes
Yes
4k @ 120Hz @ 4:4:4
Yes
No
4k @ 144Hz
No
No
8k @ 30Hz or 24Hz
Yes
No
8k @ 60Hz
Yes
No
PS5 Compatibility
PS5 Screenshot
Auto Low Latency Mode (ALLM)
Yes
Yes
4k @ 120Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
Yes
VRR
Yes
Yes
Xbox Series X|S Compatibility
Xbox Series X Screenshot
Auto Low Latency Mode (ALLM)
Yes
Yes
4k @ 120Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
Yes
VRR
Yes
Yes
Inputs Specifications
HDR10
Yes
Yes
HDR10+
No
Yes
Dolby Vision
Yes
Yes
HLG
Yes
Yes
HDMI 2.0 Full Bandwidth
Yes (HDMI 1,2,3,4)
Yes (HDMI 1,2,3,4)
HDMI 2.1 Class Bandwidth
Yes (HDMI 1,2)
Yes (HDMI 1,2)
CEC
Yes
Yes
HDCP 2.2
Yes (HDMI 1,2,3,4)
Yes (HDMI 1,2,3,4)
ATSC Tuner
1.0
1.0
USB 3.0
No
No
Variable Analog Audio Out
Yes
Yes
Wi-Fi Support
Yes (2.4 GHz, 5 GHz)
Yes (2.4 GHz, 5 GHz)
Input Photos
Side Inputs Picture
Rear Inputs Picture
Total Inputs
HDMI
4
4
USB
1
2
Digital Optical Audio Out
1
1
Analog Audio Out 3.5mm
1
1
Analog Audio Out RCA
0
0
Component In
0
0
Composite In
0
1 (adapter required, not incl.)
Tuner (Cable/Ant)
1
1
Ethernet
1
1
DisplayPort
0
0
IR In
0
0
Audio Passthrough
ARC/eARC Port
eARC
eARC
eARC: Dolby Atmos Over Dolby Digital Plus
Yes
Yes
eARC: Dolby Digital Plus 7.1
Yes
Yes
eARC: LPCM 7.1 Over Dolby MAT
Yes
Yes
eARC: Dolby TrueHD 7.1
Yes
Yes
eARC: DTS:X Over DTS-HD MA
Yes
Yes
eARC: DTS-HD Master Audio 7.1
Yes
Yes
eARC: LPCM Channels (Bitstream)
2.0
2.0
ARC: Dolby Digital 5.1
Yes
Yes
ARC: DTS 5.1
Yes
Yes
Optical: Dolby Digital 5.1
Yes
Yes
Optical: DTS 5.1
Yes
Yes
Sound Quality
Frequency Response
7.4
7.4
Frequency Response
Low-Frequency Extension
75.51 Hz
80.00 Hz
Std. Dev. @ 70
4.13 dB
4.97 dB
Std. Dev. @ 80
4.13 dB
4.80 dB
Std. Dev. @ Max
4.66 dB
4.39 dB
Max
93.8 dB SPL
95.1 dB SPL
Dynamic Range Compression
4.40 dB
1.87 dB
Distortion
6.9
8.2
Total Harmonic Distortion
Weighted THD @ 80
0.127
0.032
Weighted THD @ Max
0.962
0.385
IMD @ 80
0.52%
0.45%
IMD @ Max
6.85%
1.23%
Smart Features
Interface
8.0
8.0
Smart TV Picture
Smart OS
Roku TV
Google TV
Version
10.0.2
11
Ease of Use
Easy
Average
Smoothness
Very Smooth
Very Smooth
Time Taken to Select YouTube
4 s
2 s
Time Taken to Change Backlight
4 s
2 s
Advanced Options
Many
Many
Ad-Free
0.0
0.0
Ads Picture
Ads
Yes
Yes
Opt-out
No
No
Suggested Content in Home
Yes
Yes
Opt-out of Suggested Content
No
No
Apps and Features
8.0
9.0
Apps Picture
App Selection
Great
Great
App Smoothness
Average
Very Smooth
Cast Capable
Yes
Yes
USB Drive Playback
Yes
Yes
USB Drive HDR Playback
Yes
Yes
HDR in Netflix
Yes
Yes
HDR in YouTube
Yes
Yes
Remote
7.0
7.0
Remote Picture
Size
Medium
Small
Voice Control
Search, Some Other Features
Many Features
CEC Menu Control
Yes
Yes
Other Smart Features
No
No
Remote App
Roku
Android TV
TV Controls
Controls Picture
In The Box
In The Box Picture
Misc
Power Consumption
130 W
54 W
Power Consumption (Max)
290 W
154 W
Firmware
10.0.2 build 4264-AH
V8-T615T02-LF1V023
Check Price
55"
55"
55R646
SEE PRICE
Amazon.com
65"
65R648
SEE PRICE
Amazon.com
65"
65R646
SEE PRICE
Amazon.com
75"
75R648
SEE PRICE
Amazon.com
75"
75R646
SEE PRICE
Amazon.com
TCL 6 Series/R648 2021 8k QLED
TCL 6 Series/R646 2021 QLED
Comments
TCL 6 Series/R648 2021 8k QLED vs TCL 6 Series/R646 2021 QLED: Main Discussion
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