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BenQ TH671ST Projector Review

Tested using Methodology v0.8
Reviewed Feb 23, 2024 at 09:04 am

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 a distance of 6 to 7.2 feet, and up to 180" at a distance of ~9 feet. The projector has no automatic geometry correction features, but it has a manual 2D vertical keystone adjustment of up to 40 degrees to eliminate trapezoid effects. It has two HDMI 1.4 ports, each capable of up to 1920 x 1200 or 1080p @ 60Hz, with one integrated 5W speaker.

Our Verdict

7.3 Movies

The BenQ TH671ST is decent for watching movies. Its native contrast is good, so watching movies in pitch-black rooms is a treat. The projector is truly at its best in dark rooms because its brightness is mediocre. The projector's color gamut is very good, but it isn't bright enough to make colors pop, and it doesn't have HDR support. The projector's color accuracy before calibration is great, easily good enough for all but the most ardent color purists.

  • Good contrast for a pleasant movie watching experience in dark rooms.
  • Great image accuracy prior to calibration.
  • Wide color gamut in SDR.
  • Doesn't support HDR.
  • 7.3 Movies
  1. Updated Feb 23, 2024: Review published.
  2. Updated Feb 21, 2024: Early access published.

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, BenQ HT2060, and the BenQ HT2150ST.

Compared To Other Projectors

The BenQ TH671ST is a decent 1080p projector for watching movies in a dark room due to its good contrast. While it offers satisfactory performance for the price, there are newer models for a similar or cheaper price, like the Epson Home Cinema 1080 or the Epson EpiqVision Flex CO-W01. The Home Cinema 1080 and EpiqVision Flex CO-W01 are significantly brighter than the BenQ, so they're far superior in moderately lit rooms. However, the BenQ has the edge in darker rooms due to the better contrast.

Epson EpiqVision Flex CO-W01

The Epson EpiqVision Flex CO-W01 and BenQ TH671ST excel in different areas. The Epson is the far brighter projector as it's meant for use in bright offices with lots of light. Conversely, the BenQ has far superior contrast, making it the better choice to watch movies in a dark room. The BenQ is also a bit more colorful due to its wider color gamut, and it's much more accurate out of the box than the Epson.

BenQ HT2050A

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.

Epson Home Cinema 1080

The Epson Home Cinema 1080 is a bit better than the BenQ TH671ST. The Epson is significantly brighter and looks better in rooms with lights. It also has Wi-Fi and integrated casting support, making it easier to use out of the box than the barebones BenQ. Still, the BenQ does have better contrast, so it performs better in dark rooms.

Epson EX3280

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.

Test Results

perceptual testing image
Height 4.7" (11.9 cm)
Width 11.7" (29.6 cm)
Depth 9.1" (23.2 cm)
5.9 lbs (2.7 kg)

The BenQ TH671ST projector isn't meant to be portable as it doesn't have any automatic geometry correction features, and you need to plug it in as it doesn't have an integrated battery. As it's only 5.9 pounds, it's still pretty easy to carry around. It doesn't have an adjustable stand, but it does have slightly adjustable feet. It has one 5W speaker, so you don't absolutely need to connect it to a soundbar or sound system.

Projector Technology
Imaging Technology
Light Source
Aspect Ratio
16 : 9
Minimum Throw Ratio
Maximum Throw Ratio

This DLP projector uses a lamp as its light source, which can last from 4000 to about 15000 hours, according to the manufacturer, after which you'll need to swap the lamp for a new one. As it's a 1080p projector, it's limited to outputting a 1080p @ 60Hz resolution and doesn't have HDR support. It's a short throw projector, so you can place it close to the screen as it projects a 60" image at a distance of ~3 feet up to a 180" image at a distance of ~9 feet. Its 1.2x optical zoom lets you adjust the projection size without physically moving the unit.

Picture Quality
Picture Quality
White Light Output
804 lm
Color Light Output
852 lm
Brightness Uniformity
Screen Brightness
92 cd/m²

This projector has mediocre brightness. The sides of the projection are noticeably dimmer than the center, and it's just not very bright overall, although it's bright enough for a dim room. The BenQ HT2050A is much brighter, in case you want to keep a few lights on.

Picture Quality
Native Contrast
164 : 1

The BenQ TH671ST has good native contrast, leading to a pleasant viewing experience in dark rooms. The brighter BenQ HT2050A has even better contrast, making it more versatile than the TH671ST.

Picture Quality
Pre-Calibration Color Accuracy
White Balance dE
Color dE
Color Temperature
6,895 K
Picture Mode
Color Temp Setting
Gamma Setting

This projector has great color accuracy out-of-the-box. There are some very minor accuracy errors in the unit's colors and white balance, and its color temperature leans a bit too cold. Still, overall, it's accurate enough for all but the most ardent color purists.

Picture Quality
Post-Calibration Color Accuracy
White Balance dE
Color dE
Color Temperature
6,698 K
White Balance Calibration
2 point
Color Calibration
Picture Mode

This projector has 2-point white balance calibration and full-color calibration. After calibration, the projector's color accuracy is excellent. The white balance is stellar, and the color temperature is almost spot-on.

Users who prefer a brighter but less accurate image can enable the 'Brilliant Color' setting. We measured about 106 nits with the setting turned off and ~190 nits with it on. Here are the measurements with the setting on:

Picture Quality
Color Gamut
Rec. 709 xy
Rec. 709 uv
Rec. 2020 xy
Rec. 2020 uv

This projector has a wide color gamut. It does a near-perfect job with the Rec. 709 color space used with SDR content. However, it struggles with the Rec. 2020 color space.

Inputs & Connectivity
Wi-Fi No
USB Data Ports

This projector has two HDMI 1.4 ports, each capable of up to 1920x1200 or 1080p @ 60Hz. The HDMI 2 port has HDCP 1.4 support, so you can watch HDCP-encrypted content, like movies from streaming apps or physical media, through that port. The HDMI 2 port also has MHL support, so you can plug your phone or tablet directly into your projector to project it on the screen. There are two USB ports, but unfortunately, the mini USB port is a service port, and the bigger USB Type-A port is for power delivery only. The projector doesn't support Bluetooth or Wi-Fi.

Smart Features & Sound
Smart OS
Cast Capable

The BenQ TH671ST doesn't have a smart OS, but it does have one 5W speaker.

In The Box

  • Power cable
  • VGA cable
  • Remote control
  • 2x batteries
  • User documentation