The Sony A9S Master Series OLED is an excellent TV that delivers stunning picture quality in almost every type of content. Like all OLEDs, it can produce inky blacks for a great dark room viewing experience. It has a nearly instantaneous response time and an optional Black Frame Insertion feature, resulting in clear motion in fast-moving scenes. Input lag is significantly improved over its predecessor, the Sony A9G OLED, but it still lacks variable refresh rate support. Also, it doesn't have any HDMI 2.1 ports and can't display a 4k @ 120Hz signal, which might disappoint those looking for a TV to go with their PS5 or Xbox Series X. As is the case with all OLEDs, there are risks of permanent burn-in; however, we don't expect it to be an issue for most people who watch varied content.
The Sony XBR48A9S is an excellent TV overall. Its OLED panel has a nearly infinite contrast ratio and perfect black uniformity, making it a fantastic choice for watching movies. It's well-suited for watching TV shows or sports as it upscales lower resolution content well, and it has wide viewing angles so that you can watch with a group of people. It has a nearly instantaneous response time and low input lag to deliver an excellent gaming experience; however, it lacks VRR support, and the refresh rate is limited to 60Hz at 4k.
The Sony A9S is exceptional for watching movies. It can produce inky blacks due to its OLED panel's nearly infinite contrast ratio, and there's no blooming around bright objects since there's no backlight, which is great for dark room viewing. It displays lower resolution content well without any artifacts and can remove judder from all sources. Unfortunately, its fast response time causes stuttering in lower frame rate content.
The Sony A9S is great for watching TV shows. It has wide viewing angles, so you don't lose too much image accuracy when viewed from the side, great for those who like to walk around while watching TV. Its Android TV platform is user-friendly and has tons of apps available for download. It has exceptional reflection handling, but it might not get bright enough to overcome intense glare. Unfortunately, it's susceptible to permanent burn-in, especially with static elements like a channel logo.
The Sony A9S is excellent for watching sports. It has a nearly instantaneous response time and a Black Frame Insertion feature, resulting in almost no motion blur in fast-moving scenes. It has wide viewing angles so that images remain accurate when viewed from the side, making it ideal for watching a big game with a big group of people. It handles reflections exceptionally well, but it may struggle to overcome intense glare.
The Sony XBR48A9S is excellent for gaming. It has a quick response time and low input lag to provide a responsive gaming experience. However, it doesn't support any variable refresh rate technology, and the refresh rate is limited to 60Hz at 4k. It has a nearly infinite contrast ratio, making it an ideal choice for those who like gaming in the dark.
The Sony A9S is excellent for watching movies in HDR. It can produce a wide range of colors in HDR content thanks to its excellent color gamut and infinite contrast ratio. However, some highlights don't pop the way they should due to its aggressive Automatic Brightness Limiter. Also, there's some stutter in lower frame rate content. On the upside, there's no blooming around bright objects in dark scenes because it doesn't have a backlight.
The Sony A9S is great for gaming in HDR. It has low input lag, and its near-instantaneous response time results in almost no blur trail behind fast-moving objects. Its OLED panel has a nearly infinite contrast ratio to produce perfect blacks, making it a fantastic choice for dark rooms. It has an excellent color gamut for HDR, but it can only bring out highlights in some scenes due to its aggressive Automatic Brightness Limiter.
The Sony A9S is great for use as a PC monitor. It supports most common resolutions and can display proper chroma 4:4:4 for optimal text clarity. It handles reflections well, and it has wide viewing angles so that the image remains accurate at the sides even if you sit up close. Unfortunately, there are risks of permanent burn-in with static elements such as a desktop user interface.
The Sony XBR48A9S has a simple and minimalist design that looks almost identical to the Sony A9G OLED. The borders are thin on all sides, and it has a center-mounted stand that sits very low, which might be a problem if you have a soundbar placed in front.
The Sony A9S has a center-mounted stand that lets the TV sit very close to the table, which means that part of the screen might be obstructed if you place a soundbar in front.
Footprint of the 48" stand: 18.3" x 10.1"
The back of the TV is plain except for a few airflow vents. The bottom panel is removable, allowing you to guide all the cables towards a small cutout in the stand for cable management.
The panel itself is very thin, but the components' housing is quite thick, so it sticks out a bit when wall-mounted.
The build quality is exceptional, almost identical to the Sony A8H OLED. It's made of a mix of plastic and metal, feels very sturdy, and there are no obvious gaps. There's a little bit of flex on the back panel near the sides, but nothing that should cause concern.
Like all OLEDs, the Sony XBR48A9S can turn off individual pixels, resulting in a nearly infinite contrast ratio and perfect blacks.
The Sony A9S has a mediocre SDR peak brightness. It varies a lot depending on the scene due to its aggressive Automatic Brightness Limiter (ABL), and it gets dimmer as larger areas of the screen light up. Visibility shouldn't be an issue in most lighting conditions, but it might not be bright enough to overcome intense glare. Similar to the Sony A8H OLED, the brightness ramps up and drops back down once it reaches its peak in the 2% and 10% windows, although not by much.
We measured the SDR peak brightness after calibration in the 'Custom' Picture Mode, with Color Temperature set to 'Expert 1' and Peak Luminance set to 'High'.
If you don't mind losing image accuracy, you can get a brighter image in the 'Vivid' Picture Mode with all other settings at their default value. We achieved a peak of 668 cd/m² with these settings.
The HDR peak brightness is okay, almost identical to the Sony A8H OLED. Just like in SDR, the ABL causes the brightness to vary significantly depending on the content. It's bright enough to bring out some highlights, especially in darker scenes. Again, the brightness in the 2% and 10% windows drops slightly after reaching its peak.
We measured the HDR peak brightness before calibration in the 'Custom' Picture Mode with Brightness set to max, Contrast at '90', and Color Temperature set to 'Expert 1'.
If you don't mind losing accuracy, you can get a brighter image in the 'Vivid' Picture Mode with Peak Brightness set to 'High', Contrast Enhancer set to 'Off', and the remaining settings at their default value. We can achieve a peak of 836 cd/m² with these settings; however, it takes between 30 to 60 seconds to ramp up the brightness from 760 cd/m² to 836 cd/m².
Gray uniformity is excellent. There's almost no noticeable dirty screen effect, which is great for sports fans. Uniformity in dark scenes is better, and we didn't see any faint horizontal or vertical lines, although this can happen with more extensive use. Note that gray uniformity varies between individual units.
Like all OLEDs, the Sony A9S can turn off individual pixels to achieve perfect black uniformity.
This TV has excellent viewing angles. Images remain accurate when viewed from the side, which is ideal for large rooms with wide seating areas.
The Sony A9S has exceptional reflection handling. It does a fantastic job of reducing the intensity of bright reflections, so you shouldn't have any visibility issues in most viewing conditions.
Update 04/29/2021: We uploaded new photos because the old white balance photo was incorrect. The picture showed 20-point white balance when it's in fact 10-point. This doesn't change the results.
The accuracy is great out of the box; however, this can vary between units. Most colors and white balance are only slightly off. Gamma is nearly perfect, so most scenes appear at the correct brightness. The color temperature is much colder than our 6500k target, resulting in a blueish tint.
Accuracy is exceptional after calibration. Most colors and white balance are nearly perfect, and the color temperature is much closer to our 6500k target. Gamma is still excellent, but some scenes are slightly too bright.
You can see our recommended settings here.
The Sony A9S displays 480p content like DVDs well without any upscaling artifacts.
720p content, such as from a cable box, is upscaled well and without any artifacts.
Upscaling of 1080p content such as from Blu-rays looks good, and there are no artifacts.
Like all OLEDs, the Sony A9S uses an RGBW sub-pixel structure. They're never all on at the same time; you can see the green sub-pixel in this photo.
The Sony A9S has an excellent color gamut. It has near full coverage of the DCI P3 color space used in most HDR content and decent coverage of the wider Rec. 2020. The EOTF follows the PQ curve perfectly until its roll-off, and it's almost identical in Game mode. If you find HDR content too dim, you can get a brighter image by setting Advanced Contrast Enhancer and Peak Brightness to 'High', with Brightness and Contrast at max. These settings result in a much brighter image, as you can see in this EOTF.
This TV has a decent color volume. It mostly has trouble displaying very bright colors, particularly blue.
The Sony A9S has outstanding gradient handling. There's a tiny amount of banding in most colors, and it's most visible in the grays and greens. Setting Smooth Gradation to 'Low' doesn't seem to do much. The 'Medium' and 'High' settings do a good job of removing most banding but might cause a loss of fine details in some scenes.
There's some image retention right after exposing a high-contrast image for 10 minutes; however, it dissipates within a few minutes. Note that image retention can vary between individual units.
Like all OLEDs, the Sony A9S is susceptible to permanent burn-in, which happens when static elements stay on the screen for an extended period, like a channel logo or a desktop user interface. However, we don't expect it to be an issue for most people who watch varied content, and there are also features built-in to minimize the risks, such as Pixel Shift and Panel Refresh. You can read more about it here.
The Sony A9S has superb response time. It's nearly instantaneous, resulting in clear motion and almost no blur trail behind fast-moving objects.
The Sony A9S doesn't use PWM because there's no backlight, but it isn't flicker-free. The slight dip in brightness every 8ms is due to the TV's 120Hz refresh rate.
Update 01/11/2021: We've retested the BFI and can confirm that the backlight flickers at 96Hz in 24p content when the Clearness slider is set to '1' or '2', and 48Hz when it's set to '3'. This is the same behavior that we noticed on the Sony A8H OLED and Sony A9G OLED.
The Sony A9S has an optional Black Frame Insertion feature that can further reduce motion blur. To use BFI, enable MotionFlow, then set Clearness to '3' for 60fps content, and '1' or '2' for 120fps content. Using BFI improves image clarity, but it results in a noticeably dimmer image.
The Sony A9S can interpolate lower frame rate content up to 120fps to make motion look smoother, also known as the 'Soap Opera' effect. It performs well for the most part, but there are some artifacts in busier scenes. To use it, set Cinemotion to 'Auto' and Smoothness to max.
Due to the Sony A9S' near-instantaneous response time, lower frame rate content can appear to stutter. If it bothers you, enabling motion interpolation can help.