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BenQ TH671ST Review | 85 Data compared

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  • Avg. price in UK: ~£700
  • Avg. price in US: ~$950
  • ANSI lumens: 3000
  • Native panel resolution: 1920x1080
  • Throw ratio: 0.69-0.83:1

BenQ TH671ST review. Compare 85 technical specifications and user reviews to see how it ranks among projectors and if it is worth buying.

5.7

Overall score

What it is: An overall evaluation of the projector's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best projectors on the market.

Score components:

90.0%

5.3

Technical Score

10.0%

9.4

User score

Good
5.3

Technical Score

What it is: An assessment of the projector's technical performance, covering eight key areas: image quality, brightness, contrast, connectivity, gaming features, smart features, audio, and design.

When it matters: When you want to compare projectors based on technical performance and available features.

Score components:

42.0%

6.2

Image Quality

22.0%

5.3

Projection & Lens

12.0%

4.3

HDMI & Gaming

10.0%

4.6

Audio & Features

8.0%

3.7

Connectivity

6.0%

4.0

Design & Power

Good
9.4

User score

What it is: A rating that combines user reviews and the total number of reviews received by the projector.

When it matters: When you want to know how a projector performs in real use and how reliable it remains over time according to user feedback.

Score components:

70.0%

9.1

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.6
(643)
amazon
4.4
(189)

(Reviews last updated: June 2026)

Exceptional
  • 5.6
    Gaming

    Score components:

    35.0%

    9.2

    Input lag

    25.0%

    1.0

    Refresh rate

    20.0%

    8.6

    Output Resolution

    10.0%

    1.0

    HDR10 support

    10.0%

    2.5

    Audio output power

  • 5.2
    Portable

    Score components:

    35.0%

    9.1

    Weight

    20.0%

    ?

    Has A Built-In Speaker

    15.0%

    1.0

    Bluetooth connectivity

    15.0%

    1.0

    Wi-Fi connectivity

    15.0%

    1.0

    Smart TV features

  • 4.8
    Home theatre

    Score components:

    30.0%

    8.6

    Output Resolution

    25.0%

    1.0

    HDR10 support

    20.0%

    1.0

    Dolby Vision support

    15.0%

    8.2

    ANSI lumens

    10.0%

    5.2

    Audible noise

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Best prices in UK

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The BenQ TH671ST is a native 1080p Full HD DLP short-throw projector designed for gaming and home entertainment, capable of projecting a massive 100-inch image from just 1.5 metres (approximately 5 feet) away. It delivers a bright 3,000 ANSI lumens output and a 10,000:1 contrast ratio, featuring an ultra-fast 16.67ms input lag that ensures responsive, smooth gameplay. Main pros include its impressive 92% Rec.709 colour accuracy, a convenient 1.2x zoom lens for flexible placement, and the LumiExpert auto light sensor that adjusts brightness based on ambient room light. However, it lacks HDR support and 4K compatibility, the internal 5W mono speaker lacks significant bass, and fan noise can become noticeable during quiet scenes at higher brightness settings.

Technical Specifications of BenQ TH671ST

Technical Score

What it is: An assessment of the projector's technical performance, covering eight key areas: image quality, brightness, contrast, connectivity, gaming features, smart features, audio, and design.

When it matters: When you want to compare projectors based on technical performance and available features.

Score components:

42.0%

6.2

Image Quality

22.0%

5.3

Projection & Lens

12.0%

4.3

HDMI & Gaming

10.0%

4.6

Audio & Features

8.0%

3.7

Connectivity

6.0%

4.0

Design & Power

5.3
BenQ TH671ST has a technical score of 5.3 points, which is lower than 72.3% of projectors.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the projector.

When it matters: When you want to know how a projector performs in real use and how reliable it remains over time according to user feedback.

Score components:

70.0%

9.1

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.6
(643)
amazon
4.4
(189)

(Reviews last updated: June 2026)

9.4
BenQ TH671ST has a user score of 9.38 points, which is higher than 99.3% of projectors.
Popularity
What it is: An indicator based on the number of reviews received by the projector.
When it matters: When you prefer to buy a product chosen and reviewed by many other consumers.
10
BenQ TH671ST has a popularity of 10 points, which is higher than 83.9% of products in this category.
Ratio quality/price

What it is: An indicator that combines the projector's overall rating with its cost.

When it matters: When you are looking for a projector with a good balance between quality and price.

Score components:

60.0%

5.7

Overall score

40.0%

6.8

Price

6.0
BenQ TH671ST has a quality-to-price ratio of 6 points, which is lower than 51.5% of products in this category.
ANSI lumens
What it is: Brightness output measured in ANSI lumens.
When it matters: When you watch with ambient light or on a large screen, higher brightness matters.

Importance: HIGH

3,000
BenQ TH671ST reaches 3000 ANSI lumens, brighter than 64.2% of projectors and equal to 9.1% of projectors.
Contrast ratio
What it is: Ratio of brightest white to darkest black displayed by the projector.
When it matters: When you watch movies in a dark room, stronger contrast matters.

Importance: HIGH

10,000:1
BenQ TH671ST has a contrast ratio of 10000:1, higher than 44% of projectors and equal to 6.8% of projectors.
Native contrast ratio.
Native panel resolution
What it is: Native resolution of the display panel or imaging device.
When it matters: When picture sharpness matters enough that you want to know the projector's true native imaging resolution, not just supported input formats.

Importance: HIGH

1920x1080
BenQ TH671ST uses a native resolution of 1920x1080, higher than 26.2% of projectors and equal to 60.1% of projectors.
Output Resolution
What it is: The resolution the projector can actually display through its imaging system.
When it matters: When you want to know the actual image detail the projector can put on screen rather than just the source format it accepts.

Importance: HIGH

1920x1080
BenQ TH671ST supports output resolution up to 1920x1080, higher than 24.9% of projectors and equal to 41% of projectors.
Projection technology
What it is: Projection imaging technology used by the projector.
When it matters: When color character, contrast behavior, and overall image personality matter before you compare brightness alone.

Importance: MEDIUM

DLP
Show more
Throw ratio
What it is: Ratio between projection distance and image width.
When it matters: When room size and screen size have to match properly instead of guessing whether the projector will fit the space.

Importance: MEDIUM

0.69-0.83:1
Min throw distance
What it is: Minimum distance required between projector and screen.
When it matters: When room depth is limited and you still need a large image from a short placement distance.

Importance: MEDIUM

0.762 m
BenQ TH671ST needs a minimum throw distance of 0.762 m, shorter than 76.5% of projectors and equal to 1% of projectors.
Max projection size
What it is: Maximum supported image size for projection, measured diagonally.
When it matters: When you want a cinema-size picture, maximum projection size matters.

Importance: MEDIUM

300 inch
BenQ TH671ST supports projection sizes up to 300 inch, larger than 51.8% of projectors and equal to 38% of projectors.
Zoom ratio
What it is: Optical zoom capability expressed as a ratio.
When it matters: When projector placement is not ideal and you need optical zoom to frame the image correctly.

Importance: MEDIUM

1.2
BenQ TH671ST offers a zoom ratio of 1.2, narrower than 63.1% of projectors and equal to 22.1% of projectors.
Motorized zoom
What it is: Motorized control of the optical zoom function.
When it matters: When the projector position is fixed but screen size or framing still needs to be adjusted from a distance.

Importance: LOW

no
BenQ TH671ST does not have motorized zoom. 16.3% of projectors have motorized zoom.
Show more
Input lag
What it is: Time delay between input signal and displayed image, measured in milliseconds.
When it matters: When gaming responsiveness matters and you want controls to feel more immediate on fast titles.

Importance: MEDIUM

16.67 ms
BenQ TH671ST has input lag of 16.67 ms, lower than 72.2% of projectors and equal to 0.2% of projectors.
In 1080P.
Auto low latency mode (ALLM)
What it is: Automatically reduces input lag when gaming.
When it matters: When you play fast games, lower latency matters.

Importance: LOW

no
BenQ TH671ST does not support ALLM. 20.3% of projectors support ALLM.
Variable refresh rate (VRR)
What it is: Support for variable refresh rate to reduce screen tearing.
When it matters: When gaming matters and you want the projector to handle variable frame rates with less tearing or stutter.

Importance: LOW

no
BenQ TH671ST does not support VRR. 1.9% of projectors support VRR.
HDMI version
What it is: Version of the HDMI standard supported.
When it matters: When source devices push newer HDMI features, refresh rates, or bandwidth levels that older ports may limit.

Importance: LOW

1.4
BenQ TH671ST supports HDMI 1.4, older than 54.6% of projectors and equal to 34.1% of projectors.
Max HDMI bandwidth
What it is: Maximum bandwidth supported by HDMI inputs, measured in Gbps.
When it matters: When newer consoles, gaming PCs, or media boxes need more HDMI throughput than older projectors can handle.

Importance: LOW

10.2 Gbps
BenQ TH671ST supports HDMI bandwidth up to 10.2 Gbps, lower than 52.1% of projectors and equal to 45.4% of projectors.
Show more
N. of HDMI ports
What it is: Number of available HDMI input ports.
When it matters: When you need a console, streamer, set-top box, and another source connected at the same time without swapping cables.

Importance: LOW

2
BenQ TH671ST has 2 HDMI port/s, more than 45.5% of projectors and equal to 47% of projectors.
Wi-Fi connectivity
What it is: Support for Wi-Fi network connectivity.
When it matters: When the projector should handle network features, updates, or streaming functions without needing wired Ethernet only.

Importance: LOW

no
BenQ TH671ST does not support Wi-Fi. 52.7% of projectors support Wi-Fi.
Wi-Fi version
What it is: Supported Wi-Fi standard version.
When it matters: When wireless stability and throughput matter for streaming, updates, or projector ecosystem features.

Importance: LOW

N/A
Bluetooth connectivity
What it is: Support for Bluetooth wireless connectivity.
When it matters: When you plan to pair wireless speakers, headphones, remotes, or other accessories directly with the projector.

Importance: LOW

no
BenQ TH671ST does not support Bluetooth. 50% of projectors support Bluetooth.
Bluetooth version
What it is: Supported Bluetooth version.
When it matters: When wireless accessory compatibility and connection quality matter beyond Bluetooth being a simple checkbox.

Importance: LOW

N/A
Show more
Smart TV features
What it is: Includes built-in Smart TV functions or operating system.
When it matters: When you prefer built-in apps and streaming convenience instead of adding an external media stick or box.

Importance: LOW

no
BenQ TH671ST does not have smart TV features. 43.8% of projectors have smart TV features.
Operating system
What it is: The built-in software platform that runs the projector interface, streaming apps, and smart features.
When it matters: When you care about which apps are available, how modern the smart interface feels, and whether the projector includes a built-in streaming platform.

Importance: LOW

none
Android OS

Importance: MEDIUM

no
Dedicated smartphone app
What it is: Availability of a dedicated smartphone control app.
When it matters: When you want setup, input switching, or basic control handled from your phone without always reaching for a remote.

Importance: LOW

no
BenQ TH671ST does not come with a dedicated smartphone app. 35.6% of projectors come with a dedicated smartphone app.
Remote control
What it is: Comes with a dedicated remote control for operation.
When it matters: When you want easier everyday control without extra gear, built-in convenience features matter.

Importance: LOW

yes
BenQ TH671ST includes a remote control. 1.6% of projectors include a remote control.
Show more
Light source type
What it is: Type of light source used by the projector.
When it matters: When maintenance expectations, startup behavior, brightness stability, and long-term running costs all matter in the buying decision.

Importance: LOW

lamp
BenQ TH671ST uses lamp light source technology, less advanced than 67.1% of projectors and equal to 33% of projectors.
Laser Light Source
What it is: Whether the projector uses a laser light source instead of a traditional lamp.
When it matters: When lower maintenance, faster startup, and a lamp-free light engine matter over the long term.

Importance: LOW

no
BenQ TH671ST does not use a laser light source. 28.1% of projectors use a laser light source.
Lamp life
What it is: Expected operational lifespan of the lamp in standard mode, measured in hours.
When it matters: When you care about running costs and maintenance intervals, light-source lifespan matters.

Importance: LOW

4,000 hours
BenQ TH671ST offers lamp life of 4000 hours, longer than 77.2% of projectors and equal to 9.9% of projectors.
Lamp life (eco mode)
What it is: Expected operational lifespan of the lamp in eco mode, measured in hours.
When it matters: When you care about running costs and maintenance intervals, light-source lifespan matters.

Importance: LOW

10,000 hours
BenQ TH671ST offers eco-mode lamp life of 10000 hours, longer than 69.5% of projectors and equal to 6.8% of projectors.
Operating power consumption
What it is: Average power consumption during normal operation.
When it matters: When electricity use and heat output matter because the projector runs for long sessions or frequent daily use.

Importance: LOW

320 W
BenQ TH671ST uses 320 W of power, more than 75.3% of projectors and equal to 0.9% of projectors.
Show more

BenQ TH671ST vs the average projector

  • 36.4% brighter image
    BenQ TH671ST has higher ANSI lumens than the average projector (3,000 vs 2,200). The average projector has 2,200 ANSI lumens.
    What it is: Brightness output measured in ANSI lumens.
    When it matters: When you watch with ambient light or on a large screen, higher brightness matters.

    Importance: HIGH

    BenQ TH671ST has higher ANSI lumens than the average projector (3,000 vs 2,200). The average projector has 2,200 ANSI lumens.3,000 vs 2,200
  • Built-in stereo speakers
    BenQ TH671ST has stereo speakers, while the average projector does not. 48.9% of projectors have stereo speakers.
    What it is: Built-in stereo speakers for audio playback.
    When it matters: When casual use should include left-right sound without automatically adding an external audio setup.

    Importance: LOW

    BenQ TH671ST has stereo speakers, while the average projector does not. 48.9% of projectors have stereo speakers.
  • 10 degrees greater vertical keystone correction
    BenQ TH671ST offers more vertical keystone correction than the average projector (40 degrees degrees vs 30 degrees degrees). The average projector offers 30 degrees degrees of vertical keystone correction.
    What it is: Range of vertical keystone correction supported.
    When it matters: When the projector sits too high or too low relative to the screen and vertical image correction becomes necessary.

    Importance: MEDIUM

    BenQ TH671ST offers more vertical keystone correction than the average projector (40 degrees degrees vs 30 degrees degrees). The average projector offers 30 degrees degrees of vertical keystone correction.40 degrees vs 30 degrees
  • 0.18 inch larger DMD chip
    BenQ TH671ST has a higher DMD chip size than the average projector (0.7 inch vs 0.47 inch). The average projector has 0.47 inch of DMD chip size.
    What it is: Size of the DMD chip, measured in inches.
    When it matters: When fine image detail matters and you want more hardware context behind how sharp the picture may look on a large screen.

    Importance: LOW

    BenQ TH671ST has a higher DMD chip size than the average projector (0.7 inch vs 0.47 inch). The average projector has 0.47 inch of DMD chip size.0.65 inch vs 0.47 inch
  • 1 more audio input ports
    BenQ TH671ST has more audio input ports than the average projector (1 vs 0). The average projector has 0 audio input ports.
    What it is: Number of analog audio input ports available.
    When it matters: When you connect several devices at the same time, port count matters.

    Importance: LOW

    BenQ TH671ST has more audio input ports than the average projector (1 vs 0). The average projector has 0 audio input ports.1 vs 0
  • 0.3 m shorter throw distance
    BenQ TH671ST has a lower throw distance than the average projector (0.8 m vs 1.06 m). The average projector has 1.06 m of throw distance.
    What it is: Minimum distance required between projector and screen.
    When it matters: When room depth is limited and you still need a large image from a short placement distance.

    Importance: MEDIUM

    BenQ TH671ST has a lower throw distance than the average projector (0.8 m vs 1.06 m). The average projector has 1.06 m of throw distance.0.762 m vs 1.06 m
  • 1 more USB ports
    BenQ TH671ST has more USB ports than the average projector (2 vs 1). The average projector has 1 USB ports.
    What it is: Number of available USB ports.
    When it matters: When the projector needs to power accessories, read media, or support extra peripherals directly.

    Importance: LOW

    BenQ TH671ST has more USB ports than the average projector (2 vs 1). The average projector has 1 USB ports.2 vs 1
  • 10.33 ms lower input lag
    BenQ TH671ST has a lower input lag than the average projector (16.7 ms vs 27 ms). The average projector has 27 ms of input lag.
    In 1080P.
    What it is: Time delay between input signal and displayed image, measured in milliseconds.
    When it matters: When gaming responsiveness matters and you want controls to feel more immediate on fast titles.

    Importance: MEDIUM

    BenQ TH671ST has a lower input lag than the average projector (16.7 ms vs 27 ms). The average projector has 27 ms of input lag.16.67 ms vs 27 ms
  • 36.4% brighter image
    BenQ TH671ST has higher ANSI lumens than the average projector (3,000 vs 2,200). The average projector has 2,200 ANSI lumens.
  • 0.18 inch larger DMD chip
    BenQ TH671ST has a higher DMD chip size than the average projector (0.7 inch vs 0.47 inch). The average projector has 0.47 inch of DMD chip size.
  • 10 degrees greater vertical keystone correction
    BenQ TH671ST offers more vertical keystone correction than the average projector (40 degrees degrees vs 30 degrees degrees). The average projector offers 30 degrees degrees of vertical keystone correction.
  • 0.3 m shorter throw distance
    BenQ TH671ST has a lower throw distance than the average projector (0.8 m vs 1.06 m). The average projector has 1.06 m of throw distance.
  • 50 inch larger image size
    BenQ TH671ST has a higher projection size than the average projector (300 inch vs 250 inch). The average projector has 250 inch of projection size.
  • 10.33 ms lower input lag
    BenQ TH671ST has a lower input lag than the average projector (16.7 ms vs 27 ms). The average projector has 27 ms of input lag.
  • 1 more USB ports
    BenQ TH671ST has more USB ports than the average projector (2 vs 1). The average projector has 1 USB ports.
  • Includes VGA
    BenQ TH671ST includes VGA input, while the average projector does not. 43.1% of projectors include VGA input.
  • Built-in stereo speakers
    BenQ TH671ST has stereo speakers, while the average projector does not. 48.9% of projectors have stereo speakers.
  • 1 more audio input ports
    BenQ TH671ST has more audio input ports than the average projector (1 vs 0). The average projector has 0 audio input ports.

Total
Overall
Image Quality
Projection & Lens
HDMI & Gaming
Connectivity
Audio & Features
  • No HDR10 support
    BenQ TH671ST does not support HDR10, while the average projector does. 56.3% of projectors support HDR10.
  • 29.4% lower refresh rate
    BenQ TH671ST has a lower refresh rate than the average projector (60 Hz vs 85 Hz). The average projector has 85 Hz of refresh rate.
  • Narrower color gamut
    BenQ TH671ST has a lower color gamut coverage than the average projector (92% Rec.709 % vs 99% Rec.709 %). The average projector has 99% Rec.709 % of color gamut coverage.
  • 0.1 2x narrower zoom range
    BenQ TH671ST has a lower zoom ratio than the average projector (1.2 vs 1.3). The average projector has 1.3 of zoom ratio.
  • Limited HDMI format
    BenQ TH671ST supports a less capable max HDMI input format than the average projector (1080p/60Hz vs 4K/120Hz). The average projector supports a max HDMI input format of 4K/120Hz.
  • 43.3% lower HDMI bandwidth
    BenQ TH671ST has a lower HDMI bandwidth than the average projector (10.2 Gbps vs 18 Gbps). The average projector has 18 Gbps of HDMI bandwidth.
  • Older HDMI version
    BenQ TH671ST has Old HDMI standard than the average projector (1.4 vs 2.0). The average projector supports HDMI 2.0.
  • Old HDCP version
    BenQ TH671ST has Old HDCP version than the average projector (1.4 vs 2.2). The average projector supports HDCP 2.2.
  • No Wi-Fi support
    BenQ TH671ST does not support Wi-Fi, while the average projector does. 52.6% of projectors support Wi-Fi.
  • No sleep timer
    BenQ TH671ST does not have a sleep timer, while the average projector does. 80.8% of projectors have a sleep timer.
  • 50% weaker audio output
    BenQ TH671ST has a lower audio output power than the average projector (5 W vs 10 W). The average projector has 10 W of audio output power.
  • Basic light source
    BenQ TH671ST has Basic light source than the average projector (lamp vs laser). The average projector uses a laser light source.
  • 16,000 hours shorter lamp life
    BenQ TH671ST has a lower lamp life than the average projector (4,000 hours vs 20,000 hours). The average projector has 20,000 hours of lamp life.
  • 3 dB louder operation
    BenQ TH671ST has a higher audible noise than the average projector (33 dB vs 30 dB). The average projector has 30 dB of audible noise.
  • 86.1 W higher power use
    BenQ TH671ST uses more power than the average projector (320 W vs 233.9 W). The average projector uses 233.9 W of power.
  • 10,000 hours shorter eco lamp life
    BenQ TH671ST has a lower lamp life in eco mode than the average projector (10,000 hours vs 20,000 hours). The average projector has 20,000 hours of lamp life in eco mode.
  • 1 dB louder eco mode
    BenQ TH671ST has a higher audible noise in eco mode than the average projector (29 dB vs 28 dB). The average projector has 28 dB of audible noise in eco mode.
  • 4 older model
    BenQ TH671ST was released earlier than the average projector (2,017 vs 2,021). The average projector was released in 2,021.
    November 2017
  • No HDR10 support
    BenQ TH671ST does not support HDR10, while the average projector does. 56.3% of projectors support HDR10.
    What it is: Support for HDR10 high dynamic range standard.
    When it matters: When you want the projector to handle mainstream HDR movie and streaming content instead of standard dynamic range only.

    Importance: MEDIUM

    BenQ TH671ST does not support HDR10, while the average projector does. 56.3% of projectors support HDR10.
  • Limited HDMI format
    BenQ TH671ST supports a less capable max HDMI input format than the average projector (1080p/60Hz vs 4K/120Hz). The average projector supports a max HDMI input format of 4K/120Hz.
    What it is: Highest HDMI input format supported by the projector.
    When it matters: When you want to confirm the exact signal format the projector can accept from high-end modern sources.

    Importance: MEDIUM

    BenQ TH671ST supports a less capable max HDMI input format than the average projector (1080p/60Hz vs 4K/120Hz). The average projector supports a max HDMI input format of 4K/120Hz.1080p/60Hz vs 4K/120Hz
  • Basic light source
    BenQ TH671ST has Basic light source than the average projector (lamp vs laser). The average projector uses a laser light source.
    What it is: Type of light source used by the projector.
    When it matters: When maintenance expectations, startup behavior, brightness stability, and long-term running costs all matter in the buying decision.

    Importance: LOW

    BenQ TH671ST has Basic light source than the average projector (lamp vs laser). The average projector uses a laser light source.lamp vs laser
  • 43.3% lower HDMI bandwidth
    BenQ TH671ST has a lower HDMI bandwidth than the average projector (10.2 Gbps vs 18 Gbps). The average projector has 18 Gbps of HDMI bandwidth.
    What it is: Maximum bandwidth supported by HDMI inputs, measured in Gbps.
    When it matters: When newer consoles, gaming PCs, or media boxes need more HDMI throughput than older projectors can handle.

    Importance: LOW

    BenQ TH671ST has a lower HDMI bandwidth than the average projector (10.2 Gbps vs 18 Gbps). The average projector has 18 Gbps of HDMI bandwidth.10.2 Gbps vs 18 Gbps
  • No Wi-Fi support
    BenQ TH671ST does not support Wi-Fi, while the average projector does. 52.6% of projectors support Wi-Fi.
    What it is: Support for Wi-Fi network connectivity.
    When it matters: When the projector should handle network features, updates, or streaming functions without needing wired Ethernet only.

    Importance: LOW

    BenQ TH671ST does not support Wi-Fi, while the average projector does. 52.6% of projectors support Wi-Fi.
  • Older HDMI version
    BenQ TH671ST has Old HDMI standard than the average projector (1.4 vs 2.0). The average projector supports HDMI 2.0.
    What it is: Version of the HDMI standard supported.
    When it matters: When source devices push newer HDMI features, refresh rates, or bandwidth levels that older ports may limit.

    Importance: LOW

    BenQ TH671ST has Old HDMI standard than the average projector (1.4 vs 2.0). The average projector supports HDMI 2.0.1.4 vs 2.0
  • 29.4% lower refresh rate
    BenQ TH671ST has a lower refresh rate than the average projector (60 Hz vs 85 Hz). The average projector has 85 Hz of refresh rate.
    What it is: Number of screen refreshes per second, measured in hertz.
    When it matters: When motion clarity matters for gaming, sports, or fast-moving video instead of slower cinematic content only.

    Importance: MEDIUM

    BenQ TH671ST has a lower refresh rate than the average projector (60 Hz vs 85 Hz). The average projector has 85 Hz of refresh rate.60 Hz vs 85 Hz
  • No sleep timer
    BenQ TH671ST does not have a sleep timer, while the average projector does. 80.8% of projectors have a sleep timer.
    What it is: Feature that automatically turns off the projector after a set time.
    When it matters: When you want the projector to shut itself down automatically after a viewing session instead of staying on unnecessarily.

    Importance: LOW

    BenQ TH671ST does not have a sleep timer, while the average projector does. 80.8% of projectors have a sleep timer.
Total
Image Quality
Projection & Lens
HDMI & Gaming
Connectivity
Audio & Features
Design & Power

Graphic comparison of BenQ TH671ST and

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Third-party reviews

United Kingdom
amazon
4.6
643 Reviews
amazon
4.4
189 Reviews

(Reviews last updated: June 2026)

What customers like about BenQ TH671ST?

  • Low input lag (approx. 16.67ms) makes it excellent for casual console and PC gaming.
  • Short-throw lens allows for a 100-inch image from just 1.5 metres (5 feet) away, ideal for small rooms.
  • High out-of-the-box color accuracy (Rec. 709) rarely requires professional calibration.
  • Bright 3,000 ANSI lumens output allows for viewing in moderately lit rooms.
  • Compact and lightweight design is suitable for portable use or moving between rooms.
  • Auto-vertical keystone and LumiExpert light sensor simplify setup and viewing comfort.

What customers dislike about BenQ TH671ST?

  • No support for 4K resolution or HDR content.
  • Lack of horizontal keystone correction means the projector must be placed directly in front of the screen center.
  • Limited to a 60Hz refresh rate, which may not satisfy competitive gamers seeking 120Hz or higher.
  • Contrast can struggle in dark scenes, and some visible vignetting (gray borders) may appear on white screens.
  • Onboard 5W speaker is functional for travel but lacks the depth needed for a full home theater experience.
  • Dated connectivity options, missing modern ports like USB-C.

Expert reviews

R
rtings.com
23/02/2024
BenQ TH671ST Projector Review - RTINGS.com

The BenQ TH671ST is a 1080p short-throw projector suited for tight spaces, offering excellent out-of-the-box color accuracy, impressive installation flexibility for100-inch images, and low input lag in Game Mode suitable for casual gaming. However, it lacks HDR support, modern high-refresh-rate gaming features, and sufficient brightness for ambient light, necessitating a dark room...Read more

P
projectorcentral.com
21/01/2019
BenQ TH671ST Projector Review

The BenQ TH671ST is a highly versatile, short-throw 1080p DLP projector designed primarily for gamers but equally capable for movies, TV, and office presentations. Priced at $699 at the time of review, its standout feature is an exceptionally low input lag of 16.4 ms with Fast Mode enabled, making it ideal for serious gaming. It delivers strong brightness, measuring at 2,638 ANSI...Read more

G
gamingnexus.com
27/05/2019
BenQ TH671ST Review - Gaming Nexus

The BenQ TH671ST short-throw projector offers vibrant colors, deep blacks, and a smooth, immersive experience for gaming and media, making it a highly capable option for its $699 MSRP. Its strong performance across various media formats presents a high-quality, large-screen experience without requiring a massive budget. However, the projector lacks horizontal keystone correction,...Read more

G
gstylemag.com
11/04/2019
Gaming With The BenQ TH671ST Projector Means Not Having To Be Afraid Of The Light

The BenQ TH671ST is a highly portable, short-throw gaming projector designed to deliver an immersive 100-inch display from just 5 feet away, making it an excellent space-saving solution for small apartments. Priced affordably at $700, it offers a native 1080p resolution, 3,000 lumens of brightness, and a 10,000:1 contrast ratio. Key pros highlighted in the review include an...Read more

H
hometheaterhifi.com
29/01/2018
BenQ TH671ST DLP Projector Review - HomeTheaterHifi.com

The BenQ TH671ST is a highly capable, value-driven short-throw DLP projector tailored for both gamers and home theater enthusiasts. Priced at a reasonable $749 MSRP, it features a native 1080p resolution and a compact design that projects a massive 100-inch image from just five feet away. On the performance front, the projector delivers 3,000 lumens of peak brightness, accurate...Read more

W
windowscentral.com
06/11/2019
BenQ TH671ST projector review: Superb viewing for gaming and cinema

The ⁠BenQ TH671ST is evaluated as a highly versatile, competitively priced short-throw projector capable of serving as a direct alternative to a large living room television for both gaming and home cinema use. A major standout feature highlighted in the review is its performance in casual gaming, delivered by a low input lag of 16.67ms in Fast Mode and enhanced by an impressive...Read more

P
pcactive.nl
08/06/2018
Review of BenQ Projectors: TH671ST, W1120, W1700 Hardware", "BenQ Projector Review: TH671ST, W1120, W1700 Hardware

The PCActive review highlights three BenQ projectors catering to different needs: the short-throw TH671ST for gaming, the W1120 for general home cinema, and the 4K-enabled W1700 for premium viewing. Key strengths across the models include high brightness for daytime use, short-throw capability for small spaces, and impressive 4K picture quality, while common limitations include...Read more

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