LG C9 OLED TV Review

Updated May 02, 2019 at 09:03 am
LG C9 OLED Picture
Usage Ratings - Version 1.3
9.0
Mixed Usage
Value for price beaten by
: LG B9 OLED
9.3
Movies
8.6
TV Shows
8.8
Sports
9.4
Video Games
9.1
HDR Movies
9.0
HDR Gaming
8.7
PC Monitor
Type OLED
Sub-Type
WRGB
Resolution 4k

The LG C9 OLED is an excellent TV. Like all OLED TVs, it delivers outstanding dark room performance, thanks to the perfect inky blacks and perfect black uniformity. It has an outstanding response time, delivering clear motion with no blur trail, but this does cause stutter when watching movies. The LG C9 also supports HDMI 2.1 on all four ports, although there is currently little advantage to this, as there are no HDMI 2.1 sources available.

Unfortunately, like all OLED TVs, there is a possibility of experiencing permanent burn-in, and the brightness of the screen changes depending on the content (ABL), which may bother some people.

Our Verdict

9.0 Mixed Usage

The C9 OLED is an outstanding TV for most uses. The OLED panel produces excellent picture quality for most uses, with perfect blacks and wide viewing angles. It has a nearly instantaneous response time, which is important for gaming or for use as a PC monitor. Unfortunately, there is a risk of burn-in, and the brightness of the screen changes with different content, which may be distracting.

See our Mixed Usage recommendations
9.3 Movies

The LG OLED C9, like all OLED TVs, is an outstanding TV for watching movies. The OLED panel delivers perfect blacks, great for dark room viewing, without the need for a local dimming system. This also allows for perfect black uniformity, with no halos around bright objects, great if you watch subtitled movies. The C9 also has a nearly instantaneous response time, which unfortunately results in higher levels of stutter, especially when watching 24p movies.

See our Movies recommendations
8.6 TV Shows

The LG OLED C9 is an excellent TV for watching TV shows during the day. It has good peak brightness and an impressive anti-reflective coating, so you shouldn't have any issues, even in a bright room. It also has wide viewing angles, which is great if you like to walk around with the TV on.

See our TV Shows recommendations
8.8 Sports

Excellent TV for watching sports. It has wide viewing angles and an outstanding anti-reflective coating, great for watching the big game with a group of friends. It has a nearly instantaneous response time, which results in a clear image with no noticeable blur trail behind fast moving objects.

See our Sports recommendations
9.4 Video Games

Outstanding TV for playing video games. It has a nearly instantaneous response time, so fast-moving objects have no blur trail behind them, and it has excellent low input lag for a responsive gaming experience. The C9 also supports VRR for a smoother gaming experience with less tearing, but for the moment this is only supported on the Xbox One.

See our Video Games recommendations
9.1 HDR Movies

The LG OLED C9 is an excellent TV for watching movies in HDR. The OLED panel produces perfect blacks, it has a wide color gamut, and good peak brightness in HDR. Unfortunately, the TV's automatic brightness limiter (ABL) causes the brightness to fluctuate with different content, which may bother some people.

See our HDR Movies recommendations
9.0 HDR Gaming

Excellent TV for gaming in HDR. It has excellent gaming performance, thanks to the nearly instantaneous response time and low input lag. It has an excellent wide color gamut and good peak brightness in HDR. The brightness changes with different content, though, and this might bother some people, especially with really bright games. There is also a possibility of burn-in, which might be an issue due to the static elements found in most games.

See our HDR Gaming recommendations
8.7 PC Monitor

The LG OLED C9 is an excellent TV to use as a PC monitor, but there is a chance of burn-in with long exposure to static elements, so it is best to set up your computer to avoid static elements as much as possible. The C9 has excellent wide viewing angles, and it has an excellent response time and low input lag, so it feels very responsive when working.

See our PC Monitor recommendations
  • 9.0 Mixed Usage
  • 9.3 Movies
  • 8.6 TV Shows
  • 8.8 Sports
  • 9.4 Video Games
  • 9.1 HDR Movies
  • 9.0 HDR Gaming
  • 8.7 PC Monitor
Pros
  • Perfect deep blacks
  • Extremely low motion blur, and excellent low input lag
  • The image remains accurate when viewed at an angle
Cons
  • Brightness varies with different content due to Automatic Brightness Limiter (ABL)
  • Possibility of permanent burn-in with static content (See here)
  1. Update 5/17/2019: We've retested the input lag on the same firmware (03.50.31) and found the 4k @ 60Hz + HDR input lag is in the same ballpark as the other resolutions (around 13ms). We don't know why our previous measurements were higher, as we did confirm them twice. We've also updated the 1440p @ 60Hz input lag with this latest firmware.
  2. Update 5/2/2019: We've retested the input lag of the C9 with the firmware update 03.50.31. The input lag measurements in SDR game and PC modes have decreased. We haven't retested 1440p @ 60Hz but we will retest this in the future.

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Video

Test Results

perceptual testing image
Market Context
Market Context
Market Context

The LG C9 is a high end 2019 OLED TV, and directly replaces LG's 2018 C8. All OLEDs deliver very similar overall picture quality, so the main differences between the C9 and its competitors are the additional features and the design. The main competitors to the LG C9 are the LG B9, LG E9, Sony A9G, and Sony A8G. The main LED competitors are the Sony Z9F and the Samsung Q90R.

Design
9.5
Design
Style
Curved No

The design of the 2019 LG OLED C9 is excellent. Overall, it is very similar to the 2018 LG C8, with only minor differences. The stand supports the TV well, and there is very little wobble. The stand itself is slightly different; it isn't as tall as the C8's, so the panel is closer to the table, and the front portion of the stand doesn't stick out as much. The TV is well-built, so there shouldn't be any issues using it, but it's thin, so care should be taken when moving it.

Design
Stand

The stand supports the TV extremely well, and shouldn't cause any issues. The overall footprint of the stand is very similar to the stand on the C8, and is nearly the full width of the TV, so it still requires a fairly large table.

Footprint of the 55" TV stand: 35.6" x 9.75".

Design
Back
Wall Mount VESA 300x200

Overall, the back of the 2019 OLED C9 is nearly identical to the 2018 LG C8. Like the previous model, there are some inputs directly on the back, but most of them are towards the side of the TV.

New on the 2019 model is a plastic cover on the back of the stand. Removing this cover exposes a slot that can be used for cable management.

Design
Borders
Borders 0.37" (0.9 cm)

The borders on the OLED C9 are extremely thin. Like with previous models, there is almost no gap between the edge of the bezel and the start of the pixels.

Design
Thickness
Max Thickness 1.87" (4.8 cm)

Like with previous LG OLEDs, the bottom half of the TV houses all of the TV's electronics, and the top half is much thinner. Care should be taken when moving the C9, as this thin portion can flex easily.

Design
Temperature
Maximum Temperature
97 °F (36 °C)
Average Temperature
88 °F (31 °C)
9.0
Design
Build Quality

The LG OLED C9 has excellent build quality. The panel-only portion of the TV can flex a bit, but we don't expect this to cause any issues. It is very similar to the 2018 C8 and B8.

Picture Quality
10
Picture Quality
Contrast
Native Contrast
Inf : 1
Contrast with local dimming
N/A

As an OLED panel, the C9 is able to turn off individual pixels, so it essentially has an infinite contrast ratio.

10
Picture Quality
Local Dimming
Local Dimming
No
Backlight
N/A

The LG OLED C9 does not have a local dimming feature, as there is no backlight. Instead, it is able to turn off or dim individual pixels. This is great for dark room viewing, as there is no noticeable blooming around bright objects in dark scenes, and subtitles are displayed perfectly.

7.7
Picture Quality
SDR Peak Brightness
SDR Real Scene Peak Brightness
335 cd/m²
SDR Peak 2% Window
447 cd/m²
SDR Peak 10% Window
444 cd/m²
SDR Peak 25% Window
398 cd/m²
SDR Peak 50% Window
330 cd/m²
SDR Peak 100% Window
157 cd/m²
SDR Sustained 2% Window
430 cd/m²
SDR Sustained 10% Window
426 cd/m²
SDR Sustained 25% Window
382 cd/m²
SDR Sustained 50% Window
317 cd/m²
SDR Sustained 100% Window
151 cd/m²
SDR ABL
0.072

The LG C9 has good peak brightness with SDR content. Small highlights are brighter than on the C8 or B8, but this results in a more aggressive Automatic Brightness Limiter (ABL), which dims the screen significantly when larger areas of the screen get bright.

The C9 has a new Peak Brightness setting, which adjusts how the ABL performs. Setting this to 'Off' results in most scenes being displayed at around 303 cd/m², unless the entire screen is bright, in which case the luminosity drops to around 139 cd/m². Increasing this setting to 'Low', 'Med', or 'High' increases the peak brightness of small highlights. If ABL bothers you, setting the contrast to '80' and setting Peak Brightness to 'Off' essentially disables ABL, but the peak brightness is quite a bit lower (246-258 cd/m² in all scenes).

Unlike most TVs, the C9's peak brightness was measured with the pre-calibration settings, due to an oddity with the 100% window.

These measurements were taken in the 'Expert (Dark Room)' Picture Mode, with OLED Light set to '100', Contrast set to '90', Peak Brightness on 'High'.

Update 6/6/2019: We've retested the SDR peak brightness of the C9 with the firmware update 03.60.02. There are no significant changes in brightness from our previous measurements.

7.7
Picture Quality
HDR Peak Brightness
HDR Real Scene Peak Brightness
726 cd/m²
HDR Peak 2% Window
855 cd/m²
HDR Peak 10% Window
845 cd/m²
HDR Peak 25% Window
530 cd/m²
HDR Peak 50% Window
301 cd/m²
HDR Peak 100% Window
145 cd/m²
HDR Sustained 2% Window
814 cd/m²
HDR Sustained 10% Window
802 cd/m²
HDR Sustained 25% Window
506 cd/m²
HDR Sustained 50% Window
286 cd/m²
HDR Sustained 100% Window
138 cd/m²
HDR ABL
0.109

The LG OLED C9 can reach very good brightness levels with HDR content; slightly better than the 2018 LG C8, but still not as good as top LED models like the Samsung Q90R or Sony Z9F. Unfortunately, it doesn't perform as well in all scenes, due to the C9's aggressive ABL that dims the screen with different content. This is especially noticeable in content with large bright areas.

The HDR brightness measurements were taken in 'Cinema' mode, with OLED Light set to '100,' and Peak Brightness on 'High.' Different picture modes and color temperatures will produce different results.

8.6
Picture Quality
Gray Uniformity
50% Std. Dev.
0.989 %
50% DSE
0.128 %
5% Std. Dev.
0.499 %
5% DSE
0.102 %

Excellent gray uniformity. There is very little dirty screen effect, which is great for sports fans. Uniformity of near-dark scenes is even better, which is great. Like previous OLED TVs, there are some very faint horizontal and vertical lines noticeable in a pitch black room when displaying near-black scenes.

8.8
Picture Quality
Viewing Angle
Color Washout
49 °
Color Shift
31 °
Brightness Loss
67 °
Black Level Raise
70 °
Gamma Shift
67 °

Like all OLED TVs, the LG C9 has outstanding wide viewing angles. The brightness and black levels are good even at extremely wide viewing angles, better than LED TVs. Unfortunately, colors shift and lose accuracy at moderate angles, worse than the Sony Z9F and the Samsung Q90R, which use VA panels and a special viewing angle filter.

10
Picture Quality
Black Uniformity
Native Std. Dev.
0.249 %
Std. Dev. w/ L.D.
N/A

As the C9 can turn off individual pixels, it has near-perfect black uniformity. There is no noticeable blooming around the cross, which is great, especially if you watch content with subtitles on a dark background.

9.5
Picture Quality
Reflections
Screen Finish
Glossy
Total Reflections
1.4 %
Indirect Reflections
0.1 %

The LG OLED C9 has outstanding reflection handling, very similar to last year's C8. Like many high-end TVs, the anti-reflective coating adds a slight purple tint. There should be no issues using the TV in a bright room, but if you have a lot of windows it might not be bright enough to completely overcome glare.

7.6
Picture Quality
Pre Calibration
White Balance dE
3.46
Color dE
2.11
Gamma
2.17
Color Temperature
5929 K
Picture Mode
Expert (Dark Room)
Color Temp Setting
Warm 2
Gamma Setting
2.2

The LG OLED C9 has good accuracy with our pre-calibration settings. Colors are accurate, and most people shouldn't notice any inaccuracies, but the white balance is a little off, giving pure whites a slightly yellowish tint that some people might notice.

Overall, it follows the gamma target well, but some near-black details are crushed. This can be seen in the spike at the beginning of this higher resolution gamma plot. Increasing the Brightness setting does help compensate for this a bit, but doesn't completely correct it.

9.5
Picture Quality
Post Calibration
White Balance dE
0.44
Color dE
0.91
Gamma
2.18
Color Temperature
6539 K
White Balance Calibration
22 point
Color Calibration
Yes
Auto-Calibration Function
Yes

After calibration, the LG OLED C9 has nearly perfect accuracy. The white balance dE and color accuracy are both extremely good, and any remaining inaccuracies are completely unnoticeable.

The TV features an auto-calibration feature. This feature still requires a licensed copy of CalMAN, and a colorimeter.

You can see our recommended settings here.

8.0
Picture Quality
480p Input

The C9 upscales 480p content well, with no obvious upscaling artifacts.

8.0
Picture Quality
720p Input

720p content is upscaled well, with no strange artifacts. There is a new AI upscaling feature, as well as the existing Super Resolution feature found on older LG TVs. Visually, we didn't notice much difference between them with our test patterns, but for some content it might make a difference.

9.0
Picture Quality
1080p Input

1080p content looks almost as good as native 4k content on the C9.

10
Picture Quality
4k Input

Although the LG OLED C9 uses an RGBW pixel structure, there are no issues displaying 4k content, as each pixel has all four sub-pixels.

8.6
Picture Quality
Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
97.21 %
DCI P3 uv
98.68 %
Rec 2020 xy
71.57 %
Rec 2020 uv
75.53 %

The C9 can display a wide color gamut, which is great for watching HDR content. It can display almost the entire DCI P3 color space, which is great, and has good coverage of the wider Rec. 2020 color space.

In 'Cinema' mode, the TV follows the target PQ curve very closely, but has a sharp roll off at the TV's peak brightness, so some bright detail may be crushed. In 'Game' mode, the EOTF is nearly identical.

With the 2019 version of the CalMAN software, it is possible to customize the TV's EOTF. We didn't test this out, but you can find out more about this feature here.

If you find HDR too dim, check out our recommendations here.

7.3
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
84.6 %
10,000 cd/m² DCI P3 Coverage ITP
46.8 %
Normalized Rec 2020 Coverage ITP
61.7 %
10,000 cd/m² Rec 2020 Coverage ITP
34.4 %

The C9 has decent color volume, very similar to the C8. Although the C9 has an excellent color gamut, it loses volume at the top. The WRGB pixel structure allows it to produce bright whites, but colors aren't as bright. On the other hand, thanks to the perfect contrast ratio it can produce dark saturated colors with no issues, unlike the majority of LED TVs.

9.0
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.081 dE
Green (Std. Dev.)
0.091 dE
Blue (Std. Dev.)
0.072 dE
Gray (Std. Dev.)
0.074 dE

The C9 has excellent gradient handling. There is some very slight banding in some colors, but this shouldn't be very noticeable.

When watching lower quality content that has lots of banding in it, the Smooth Gradation feature can help to reduce banding, especially when there are large areas of banding. Note that enabling this feature can cause a loss of fine details in some scenes, but the C9 appears to behave differently from the C8 and is a bit more conservative.

10
Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.00 %
IR after 2 min recovery
0.00 %
IR after 4 min recovery
0.00 %
IR after 6 min recovery
0.00 %
IR after 8 min recovery
0.00 %
IR after 10 min recovery
0.00 %

The C9 shows some slight signs of temporary image retention, but it is too faint to be detected by our software.

This test is only indicative of short term image retention, and not the permanent burn-in that may occur with longer exposure to static images. We are currently running a long-term test to help us better understand permanent burn-in. You can see our results and read more about our investigation here.

1.0
Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk
Yes

Update 11/01/2019: Updated text to include our stance on burn-in.

Although we don't expect most people who watch varied content to have any issues, OLED TVs, such as the LG OLED C9 do have the possibility of experiencing burn in.

The LG C9 has three features to help mitigate burn-in. We recommend enabling the Screen Shift option, and setting Logo Luminance Adjustment to 'Low.' There is also an automatic pixel refresher that can be run manually if needed.

You can read about our investigation into this here.

Picture Quality
Pixels

Like all other OLEDs, the C9 uses 4 sub-pixels, but all 4 are never used at the same time. This image shows the red, white, and blue sub-pixels. You can see the green sub-pixel in our alternative pixel photo.

Motion
10
Motion
Response Time
80% Response Time
0.2 ms
100% Response Time
2.4 ms

Like all OLED TVs, the LG C9 has a nearly-instantaneous response time. There is some very subtle overshoot in near-black scenes, but this shouldn't be very noticeable.

This extremely fast response time can cause the image to stutter, which may bother some people.

10
Motion
Flicker-Free
Flicker-Free
No
PWM Dimming Frequency
0 Hz

The LG C9 does not use PWM, as there is no backlight, but there is a slight dip in brightness approximately every 8 ms, which coincides with the TV's refresh rate. This should not be noticeable.

8.7
Motion
Black Frame Insertion (BFI)
Optional BFI
Yes
Min Flicker for 60 fps
60 Hz
60 Hz for 60 fps
Yes
120 Hz for 120 fps
No
Min Flicker for 60 fps in Game Mode
60 Hz

The LG OLED C9 has an optional Black Frame Insertion feature that can improve the appearance of motion.

On the C9, this option is activated by setting TruMotion to 'User' and toggling the OLED Motion setting. This option can only be turned on or off, and it always flickers at 60Hz. Enabling this option will cause judder when playing back 24p content.

10
Motion
Motion Interpolation
Motion Interpolation (30 fps)
Yes
Motion Interpolation (60 fps)
Yes

Update: 9/16/2019 We have retested the C9 with the same video that we tested the C9 and E9 and found it's interpolation behavior to be the same. The text below has been updated.

The C9 can interpolate lower frame-rate content up to 120Hz. This introduces an effect known as the 'Soap Opera Effect,' which some people don't like, but reduces the amount of stutter. The C9, unlike many new TVs, continues to interpolate during fast scene changes, which can create a lot of artifacts. This behavior is similar to the B9 and the E9.

See here for the settings that control the C9's motion interpolation feature.

5.0
Motion
Stutter
Frame Hold Time @ 24 fps
39.3 ms
Frame Hold Time @ 60 fps
14.3 ms

Due to the nearly instantaneous response time of the LG OLED C9, 24p motion can appear to stutter, as each frame is held static onscreen for nearly the entire time. This can be especially noticeable in slow panning shots when watching movies.

If this effect bothers you, you can either enable the TV's OLED Motion feature, which can help a bit, or enable the C9's motion interpolation feature.

10
Motion
24p Judder
Judder-Free 24p
Yes
Judder-Free 24p via 60p
Yes
Judder-Free 24p via 60i
Yes
Judder-Free 24p via Native Apps
Yes

The LG C9 is able to play 24p content without judder, regardless of the source.

See our recommended settings to remove judder here.

When the TV's BFI mode is enabled, there is always judder with 24p content.

not tested
Motion
Variable Refresh Rate
Native Refresh Rate
120 Hz
Variable Refresh Rate
HDMI Forum VRR
G-SYNC Compatible
Yes (NVIDIA Certified)
VRR Supported Connectors
HDMI

Update 11/27/2019: The C9 is now compatible with recent NVIDIA G-SYNC graphics cards, and is officially certified as G-SYNC compatible.

Update 12/12/2019: We retested the C9 with the latest firmware, and it no longer flickers when in Game Mode on an Xbox One with HDR and the variable refresh rate feature enabled.

The LG C9 has a native 120Hz refresh rate, and it supports VRR, which is great. It only supports HDMI Forum's new HDMI-VRR format, which is only supported on new Xbox Ones, or with a recent NVIDIA graphics card. The C9 is officially supported by NVIDIA's G-SYNC compatible mode, which is enabled automatically when connected to a recent NVIDIA graphics card.

Inputs
9.7
Inputs
Input Lag
1080p @ 60 Hz
13.5 ms
1080p @ 60 Hz Outside Game Mode
100.8 ms
1440p @ 60 Hz
13.9 ms
4k @ 60 Hz
13.4 ms
4k @ 60 Hz + 10 bit HDR
13.4 ms
4k @ 60 Hz @ 4:4:4
13.3 ms
4k @ 60 Hz Outside Game Mode
50.6 ms
4k @ 60 Hz With Interpolation
96.7 ms
8k @ 60 Hz
N/A
1080p @ 120 Hz
6.8 ms
1440p @ 120 Hz
6.6 ms
8k with VRR
N/A
Auto Low Latency Mode (ALLM)
Yes

The LG C9 has outstanding low SDR input lag in 'Game' mode. In 'PC' mode, the input lag is higher than the C8, which is somewhat strange. With the latest firmware (05.30.31) we measured a higher input lag with 4k @ 60Hz + HDR signals. This is fine for most people, but may be disappointing for fast-paced HDR games. This is strange, and we expect it to be reduced in a future firmware update.

New on the C9 is support for Auto Low Latency Mode. See our recommended settings for Gaming.

Update 05/02/2019: We've retested the input lag of the C9 with the firmware update 03.50.31. The input lag measurements in SDR game and PC modes have decreased. We haven't retested 1440p @ 60Hz but we will retest this in the future.

Update 05/09/2019: Text clarifications added.

Update 05/17/2019: We've retested the input lag on the same firmware (03.50.31) and found the 4k @ 60Hz + HDR input lag is in the same ballpark as the other resolutions (around 13ms). We don't know why our previous measurements were higher, as we did confirm them twice. We've also updated the 1440p @ 60Hz input lag with this latest firmware.

9.6
Inputs
Supported Resolutions
1080p @ 60 Hz @ 4:4:4
Yes
1080p @ 120 Hz
Yes (native support)
1440p @ 60 Hz
Yes (forced resolution required)
1440p @ 120 Hz
Yes (native support)
4k @ 60 Hz
Yes
4k @ 60 Hz @ 4:4:4
Yes
8k @ 30 Hz or 24 Hz
No
8k @ 60 Hz
No

The LG C9 supports the vast majority of resolutions we test for, including 1440p, which is new this year for LG TVs. Chroma 4:4:4 can be displayed properly with any resolution, as long as PC mode is enabled.

LG advertises that the C9 supports a 4k @ 120Hz input from external devices, but unlike the Samsung Q90R, it appears that this only works with HDMI 2.1 sources, as we were unable to get it to work. We will retest this once we have an HDMI 2.1 source.

Inputs
Input Photos
Inputs
Total Inputs
HDMI 4
USB 3
Digital Optical Audio Out 1
Analog Audio Out 3.5mm 1
Analog Audio Out RCA 0
Component In 0
Composite In 1 (incl. adapter)
Tuner (Cable/Ant) 1
Ethernet 1
DisplayPort 0
IR In 0
SD/SDHC 0
Inputs
Inputs Specifications
HDR10
Yes
HDR10+
No
Dolby Vision
Yes
HLG
Yes
3D
No
HDMI 2.0 Full Bandwidth
Yes (HDMI 1,2,3,4)
HDMI 2.1
Yes (HDMI 1,2,3,4)
CEC Yes
HDCP 2.2 Yes (HDMI 1,2,3,4)
USB 3.0
No
Variable Analog Audio Out Yes
Wi-Fi Support Yes (2.4 GHz, 5 GHz)

The LG OLED C9 is advertised to support HDMI 2.1, but with no HDMI 2.1 sources, it isn't currently possible for us to test.

Inputs
Audio Passthrough
ARC
Yes (HDMI 2)
eARC support
Yes
Dolby Atmos via TrueHD via eARC
Yes
DTS:X via DTS-HD MA via eARC
Yes
5.1 Dolby Digital via ARC
Yes
5.1 DTS via ARC
Yes
5.1 Dolby Digital via Optical
Yes
5.1 DTS via Optical
Yes

The C9 supports eARC when connected to a compatible AV Receiver, which allows it to send higher quality DTS:X and Dolby Atmos via TrueHD sound from an external device to your receiver. Like the 2018 LG OLEDS, it also supports DTS and Dolby Digital passthrough to a standard ARC receiver.

When connected to a PC, the PC detected the C9 as a stereo device, so it wasn't possible to send 5.1 or 7.1 audio to the TV without bypassing the PC's autodetection system.

Update 05/24/2019: Retested the eARC passthrough with a different PC, and no bypassing was necessary: the PC still detected the C9 as a stereo device, but the bitstreaming ignored that fact, and sent 7.1 TrueHD audio without a problem.

Sound Quality
7.4
Sound Quality
Frequency Response
Low-Frequency Extension
67.27 Hz
Std. Dev. @ 70
2.67 dB
Std. Dev. @ 80
2.74 dB
Std. Dev. @ Max