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 decent for watching movies. Its brightness is just okay, but its contrast is satisfactory, so watching movies in pitch-black rooms is a pleasant experience. The projector's color gamut is very good, but it isn't bright enough to make colors pop, and this model doesn't have HDR support. The projector's color accuracy before calibration is great; it's easily good enough for all but the most ardent color purists.
Satisfactory contrast, especially in brighter content.
- Great image accuracy prior to calibration.
- Wide color gamut in SDR.
Okay brightness, so it looks fine in very dim rooms.
- Doesn't support HDR.
Truly needs a blacked out room to look its best.
Contrast struggles in dark content.
This short-throw BenQ TH671ST is decent for gaming when set up correctly, though it doesn't support HDR. In Game Mode with Fast Mode, input lag is responsive enough for most single-player titles. Still, there's no 120Hz, VRR, or 4k support, so you're capped at 1080p @ 60Hz. Motion is clean for DLP, and the lamp gets bright enough for a very dim room, though not bright enough for anything brighter. Still, it works best in a dark room due to its satisfactory contrast. The projector is very accurate out of the box, so you won't need to have it calibrated to get an accurate image.
Satisfactory contrast, especially in brighter content.
- Great image accuracy prior to calibration.
- Wide color gamut in SDR.
Okay brightness, so it looks fine in very dim rooms.
- Doesn't support HDR.
Limited to 1080p @ 60Hz, with no high-refresh rate option.
Truly needs a blacked out room to look its best.
Contrast struggles in dark content.
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.
Okay brightness, so it looks fine in very dim rooms.
Truly needs a blacked out room to look its best.
The BenQ TH671ST's contrast is satisfactory. It struggles in dark scenes, but its relative contrast improves meaningfully in brighter content, with solid separation between dark and bright elements.
Satisfactory contrast, especially in brighter content.
Contrast struggles in dark content.
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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Updated Feb 06, 2026:
We've modified the text in our Brightness and Native Contrast text boxes as a result of our latest test bench. We've also added Brightness and Contrast performance usages in the Verdict section.
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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 projector is a decent 1080p projector for watching movies in a dark room due to its satisfactory contrast. It performs better in dark rooms than other comparable models, like the Epson Home Cinema 1080 or the Epson EpiqVision Flex CO-W01, although they're both far better than the BenQ in brighter rooms due to their higher peak brightness. Where the BenQ also offers solid value is in its gaming prowess; while it doesn't support HDR and is limited to 1080p @ 60Hz, its input lag there is low enough for a solid single-player experience. Ultimately, this makes the BenQ a great value if you're shopping for a cheaper movie or gaming projector for use in darker rooms, and it's more versatile than its contemporaries when it comes to room placement due to its short-throw capabilities.
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 X500i is much more expensive than the BenQ TH671ST, but it also outperforms it in every way. They're short-throw projectors with an identical throw ratio, meaning that they can both be placed at the same distance from the wall or screen. Still, the X500i is a bit brighter, has better contrast, and is more accurate out-of-the-box. The X500i also has more features for gamers and comes with the advanced QS02 dongle, giving it a well-rounded set of streaming/wireless features. In comparison, the TH671ST doesn't come with a dongle and doesn't have any wireless features or a smart OS as a result.
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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