The BenQ TH671ST is a 1080p short-throw projector primarily aimed at home theater use, although it doesn't support HDR. It projects a 100" image at a distance of 5 to 6 feet, 120" at 6 to 7.2 feet, and up to 180" at ~9 feet. The projector includes auto vertical keystone for quick squaring and also offers manual vertical keystone up to ±40° to correct trapezoid effects. It has two HDMI 1.4 ports, each capable of up to 1920×1200 or 1080p @ 60Hz, with one integrated 5W speaker.
Our Verdict
The BenQ TH671ST is sub-par for home theater. Its okay contrast gives most scenes some depth, but black levels aren't especially deep, and scenes with large bright areas look flatter. It also has a very noticeable rainbow effect, so those sensitive to it may find it distracting. Movie motion also looks uneven during camera pans when a streaming device, console, or PC outputs at 60Hz. To keep playback smooth, you need a source that matches the content's frame rate, such as an Apple TV with Match Frame Rate enabled. Its accurate colors and relatively quiet fan help round out the package, but they don't overcome those viewing limitations.
Very accurate colors out of the box.
Short-throw lens makes a large image practical in smaller spaces.
Fan isn't especially distracting.
- Doesn't support HDR.
Blacks aren't especially deep, and scenes with lots of bright content look flat.
Lighter color shades lose saturation, so colorful scenes can look muted.
Very noticeable rainbow effect for viewers who are sensitive to it.
Movie motion is uneven from 60Hz sources that don’t match the content's frame rate.
The BenQ TH671ST is sub-par for outdoor use. Its brightness is only okay, so it works best after nightfall and looks washed out when there’s ambient light. Its compact, lightweight body is easy enough to bring outside, but you’ll need access to an outlet due to the lack of a battery. You'll also need to use your own bag or case to protect the unit during transport, as it doesn't have a handle or an included carry case. Its limited placement and image-adjustment options also make temporary setups more involved, as you need to adjust the image or the positioning manually.
Short-throw lens makes a large image practical in smaller spaces.
Compact, lightweight body is easy to move.
Limited physical adjustment and manual screen adaptation make it longer to setup after moving it.
Not bright enough for areas with much ambient light.
No battery, carrying handle, or included case.
The BenQ TH671ST is mediocre for bedroom use. Its compact, lightweight design and short-throw lens are well-suited to a smaller room, and its fan isn't especially distracting. However, its limited physical adjustments and entirely manual screen adaptation make it harder to get a properly aligned image from a nightstand or other convenient surface, especially if you move it between uses.
Short-throw lens makes a large image practical in smaller spaces.
Compact, lightweight body is easy to move.
Fan isn't especially distracting.
Limited physical adjustment and manual screen adaptation make it longer to setup after moving it.
The BenQ TH671ST is mediocre for gaming. With Game Mode and Fast Mode enabled, it feels responsive enough for most casual and single-player games, and its DLP technology keeps motion looking clean. However, it's limited to 1080p @ 60Hz, so it can't take full advantage of modern consoles or gaming PCs. Like many projectors, it works best in dark rooms: it doesn't have the brightness to handle much ambient light, and its okay contrast means dark games won't have especially deep blacks while brighter scenes can look flatter.
Very accurate colors out of the box.
Short-throw lens makes a large image practical in smaller spaces.
Responsive 1080p @ 60Hz gaming for casual and single-player titles.
- Doesn't support HDR.
Not bright enough for areas with much ambient light.
Blacks aren't especially deep, and scenes with lots of bright content look flat.
Lighter color shades lose saturation, so colorful scenes can look muted.
The BenQ TH671ST's brightness is okay. It's bright enough for a dim room, but it certainly looks much better in a completely blacked-out setting. Its uniformity is good, but there is some visible vignetting on white screens.
Not bright enough for areas with much ambient light.
The BenQ TH671ST has okay contrast. Blacks aren't especially deep, but most scenes still have some depth. However, when much of the screen is bright, the image looks flatter and less punchy.
Blacks aren't especially deep, and scenes with lots of bright content look flat.
The BenQ TH671ST is okay for portability. Its compact body weighs only 6 pounds, so it's easy to carry from room to room or take elsewhere. However, it has no battery or included carrying case, and its limited placement and screen-adjustment options make repeated setup less convenient than its size suggests.
Short-throw lens makes a large image practical in smaller spaces.
Compact, lightweight body is easy to move.
Limited physical adjustment and manual screen adaptation make it longer to setup after moving it.
No battery, carrying handle, or included case.
The BenQ TH671ST has decent color performance. It's very accurate out of the box, so most content looks natural without calibration. However, its sub-par color volume means colorful scenes don't look especially rich or punchy: colors hold up better in darker and midtone shades, while lighter shades lose saturation and look muted.
Very accurate colors out of the box.
- Doesn't support HDR.
Lighter color shades lose saturation, so colorful scenes can look muted.
The BenQ TH671ST has okay gaming responsiveness. In Game Mode with Fast Mode enabled, its input lag at 1080p @ 60Hz feels responsive enough for most casual and single-player games, while its DLP technology keeps motion looking clean. However, it's capped at 1080p @ 60Hz and doesn't support VRR, so competitive players won't get the smoother, more immediate feel of a modern gaming projector.
Responsive 1080p @ 60Hz gaming for casual and single-player titles.
Limited to 1080p @ 60Hz, with no 4k, 120Hz, or VRR support.
Performance Usages
Changelog
- Updated Jul 28, 2026: We've converted the review to Test Bench 1.0, which replaces our Color Gamut test with Color Volume and adds a new Rainbow Effect test box. We also updated Effective Contrast (formerly Native Contrast) to account for projector brightness and reworked Judder scoring. The new bench also adds Outdoors and Bedroom usages, plus Portability, Color, and Gaming Responsiveness Performance Usages; Movies is now Home Theater, and all existing usage scores have been updated. See the 1.0 changelog.
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Updated Jun 17, 2026:
We mention the newly reviewed BenQ TH575 in the Contrast section of this review.
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Updated May 29, 2026:
We've added text to some test boxes as a result of our latest test bench.
- Updated May 13, 2026: We've converted the review to Test Bench 0.12, which adds new Judder, Screen Adaptation, Battery, Maximum Volume, Size, Mobility Features, and Physical Setup Features test boxes. We also updated Inputs & Connectivity to verify Bluetooth support with wireless speakers or headphones. See the 0.12 changelog.
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Differences Between Sizes And Variants
We bought and tested the BenQ TH671ST. It's an older product and has since been replaced in BenQ's Home Theater projector lineup by other models, like the BenQ HT2050A, the BenQ HT2060, and the BenQ HT2150ST.
| Model | Light Source | Throw Type | HDR Support |
|---|---|---|---|
| BenQ TH671ST (tested) | Lamp (DLP) | Short-throw | No |
| BenQ HT2150ST | Lamp (DLP) | Short-throw | No |
| BenQ HT2050A | Lamp (DLP) | Standard-throw | No |
| BenQ HT2060 | LED (DLP) | Standard-throw | Yes |
Our unit was manufactured in August 2023.
Popular Projector Comparisons
The BenQ TH671ST is best viewed as an older, budget short-throw 1080p projector for people who need a large image in a shallow room and primarily watch regular SDR content or play casual 1080p @ 60Hz games in a dim room. It has very accurate colors out of the box and input lag that feels responsive enough for single-player gaming, but it lacks 4k support. It also isn't a strong all-around home-theater choice: its contrast is only okay, it produces noticeable rainbow artifacts for people sensitive to them, and movies can look uneven when played from a typical 60Hz streaming device, console, or PC unless the source matches the content's frame rate.
Compared with the Epson Home Cinema 1080 and Epson EpiqVision Flex CO-W01, the BenQ has better contrast, making it the better of those options for a dim-room image. However, both Epsons are much brighter for rooms with lights, and the Home Cinema 1080 also has Wi‑Fi and Miracast support. The TH671ST's main advantage is its short-throw lens, which makes a large image possible in rooms that lack the depth for a conventional projector.
Check out our recommendations for the best short-throw projectors and the best projectors for home theater. If you'd prefer a cheaper unit, look up the best cheap projectors instead.
The BenQ TH671ST is a bit better than the BenQ TH575, but you might prefer the latter based on what you prioritize. The TH575 is brighter and has vastly better contrast, so it does project a more striking image at times. However, the TH671ST is much more accurate and has a much wider color gamut, so more colorful content looks more vibrant and natural on that unit.
The BenQ HT2050A offers better image quality than the older BenQ TH671ST. Unfortunately, this comes at a cost, as the HT2050A has inadequate color accuracy out of the box, while the TH671ST excels in that area. If you're willing to calibrate it, then the HT2050A projects a brighter image, with better contrast, than the TH671ST.
The Epson Home Cinema 1080 and BenQ TH671ST excel in different room contexts. The Epson is significantly brighter and looks better in rooms with lights, while the BenQ has better contrast, so it performs better in dark rooms. The Epson has Wi-Fi and integrated casting support, making it easier to use out of the box than the barebones BenQ. Overall, if you're mostly watching movies in dark rooms, then the BenQ is a bit better; otherwise, the Epson is brighter and easier to place in a variety of rooms.
The Epson EX3280 and BenQ HT2050A are different projectors, each with strengths and weaknesses. The EX3280 is the brighter projector, as it is bright enough even for well-lit rooms. Inversely, the BenQ TH671ST has better contrast, so it looks its best when the lights are off. Ultimately, the BenQ is the better product for content consumption as it projects a 1080p image with a 16:9 aspect ratio, while the Epson's 1024 x 768 4:3 resolution is not well-suited for watching movies and is better used as an office machine.
We've independently bought and tested over 80 projectors and published detailed results for each, so you can decide which one to buy. These have all been tested under the same standardized methodology, allowing you to compare them side by side. We still have all these projects in our lab, so we can continually go back and compare them to ensure our reviews are still accurate. All our test methodologies are also public on our website, so you can validate the results yourself.
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