BenQ TH671ST vs TH575 vs TH685i: Which 1080p Projector Offers the Best Low Latency Experience?

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Introduce​

Parameter	BenQ TH671ST​	BenQ TH575​	BenQ TH685i​
Picture​	​	​	​
Price​	$799.99​	$599​	$799​
Recommended Uses​	Gaming​	Education, Home Cinema, Gaming, Business​	Gaming​
Highlight​	Resolution: Full HD 1080p Brightness: 3000 ANSI lumens Throw Distance: Short throw (100 Inch at 1.5 m) Audio: Built-in speaker Ports: HDMI x 2 Compatibility: Google Chromecast, Apple TV, Amazon Fire TV Image Adjustment: Vertical keystone correction Feature: BenQ's wall color mode​	Model: New 2023 Brightness: 3800 ANSI Lumens Contrast Ratio: 15,000:1 Resolution: 1080p Full HD Input Lag: 16ms (1080p@60Hz) Response Time: Microsecond DMD Projection Distance: 10.8ft for 100" images Special Features: Low latency, high contrast for dark scenes, gaming immersion​	Resolution: 1080p, 4K compatible Brightness: 3500 ANSI lumens HDR Support: HDR-ready Image Size: 100 inches from 8.2 feet (2.5m) Color Accuracy: 95% Rec. 709 Gaming Features: 8.3ms low latency, Game Mode, LumiExpert Console Compatibility: PS4, PS5, Nintendo Switch, Xbox One X, Google Stadia Entertainment Platform: Google-certified Android TV, 5,000+ apps User Features: Airplay, Chromecast, remote control for TV and projector​

Side-by-Side Comparison​

Display​

Parameter	BenQ TH671ST​	BenQ TH575​	BenQ TH685i​
Screen Size​	100 Inches - 300 Inches​	30 Inches - 300 Inches​	30 Inches - 300 Inches​
Throw Distance​	3 Feet - 15 Feet​	8 Feet - 5 Feet​	1.13 Feet - 1.46 Feet​
Contrast Ratio​	10000:1​	15000:1​	-​
Display Resolution​	1980 x 1080​	1920 x 1080 Pixels​	1920 x 1080 Pixels​
Native Resolution​	1920 x 1080​	1920 x 1080​	1920 x 1080​
Brightness​	3000 ANSI Lumen​	3800 Lumen​	3500 Lumen​
Display Type​	DLP​	DLP​	DLP​
Picture Quality Enhancement​	Some technology to improve image quality​	LED​	-​

Features​

Parameter	BenQ TH671ST​	BenQ TH575​	BenQ TH685i​
Video Encoding​	-​	-​	AVC​
Lamp Wattage​	240 Watts​	210 Watts​	245 Watts​
Light Source Life​	-​	15000 Hours​	20000 Hours​
Controller Type​	Button Control​	Remote Control, Button Control​	RCI067​
Control Method​	Remote​	Remote​	Remote​
Mount Type​	Wall Mount​	Tabletop Mount​	(Optional),CMG3​
Noteworthy Features​	Portable​	Digital Keystone Correction, Speakers, 3d-Ready​	Internet Built-In, Speakers, Short Throw, 3d-Ready​

Connectivity​

Parameter	BenQ TH671ST​	BenQ TH575​	BenQ TH685i​
Connectivity Technology​	VGA, HDMI​	HDMI​	USB, HDMI​
Hardware Connectivity​	VGA, HDMI​	HDMI​	HDMI​
Compatible Devices​	Television, Gaming Console, Laptop, Smartphone​	Laptop, Gaming Console, Speaker​	TV Stick​

Measurements​

Parameter	BenQ TH671ST​	BenQ TH575​	BenQ TH685i​
Dimensions L x W x H​	11.65"L x 8.7"W x 4.72"H​	11.65"L x 8.7"W x 4.72"H​	18.3"L x 13.7"W x 7.2"H​
Item Weight​	2.3 Kilograms​	7.65 Pounds​	9.6 Pounds​

Conclusion​

Product	PROS AND CONS​
BenQ TH671ST​	Pros • Fantastic picture quality, especially for the price • Short throw distance allows for a large image in smaller spaces • Digital keyframe adjustment maintains image quality • Brightness auto-adjusts for clear viewing in well-lit rooms • Good audio quality, sufficient for casual viewing • Minimal noise during operation • Sharp edges that create an impressive image even without a dedicated screen • Great for gaming with no noticeable lag • Strong performance in different lighting conditions Cons • Limited keystone options require precise mounting • Color richness not as high as some higher-end models • Rainbow effect may be noticeable on larger screens • Requires high-quality source material for optimal image quality Overall Impression This projector is an excellent choice for those looking for a high-quality image in a compact setup. Its ability to deliver a large, bright picture with minimal distance is impressive, making it suitable for various uses including movies and gaming. While it has some limitations in color richness and keystone adjustments, the overall performance and value make it a worthwhile investment for home entertainment.
BenQ TH575​	Pros • Excellent value for money with better specs than some higher-priced competitors • 1080p resolution providing clear and bright images, even in well-lit rooms • Replaceable bulb, preventing the device from becoming obsolete after bulb failure • Easy setup with manual focus and zoom adjustments • Multiple HDMI ports and an audio port for versatile connectivity • Suitable for both indoor and outdoor use; performs well in various lighting conditions • Low input lag, making it suitable for gaming Cons • Lacks horizontal keystone adjustment, potentially limiting placement options • Noise level may be noticeable to some users, although not reported as loud by most • Performance may vary in very bright outdoor conditions, requiring careful setup Overall Impression This projector offers an impressive combination of features and performance for its price range. With its bright and clear display, ease of use, and versatile connectivity options, it stands out as an excellent choice for both casual viewing and gaming. The replaceable bulb is a significant advantage, ensuring longevity. While it may have some minor limitations, it provides great value, especially for those seeking a reliable entry-level projector. Highly recommended for budget-conscious buyers looking for quality.
BenQ TH685i​	Pros • Amazing picture quality, especially for 4K HDR content • Bright enough for use with shades open • Quiet fan operation and does not overheat • Auto keystone feature simplifies setup • Suitable for both gaming and movie watching • Good upgrade from lower-end projectors Cons • Bulb replacement can be expensive and may fail sooner than expected • Android TV version can lead to confusion with multiple remotes • Limited support for Dolby Atmos without additional devices • Hidden compartment for smart capabilities may be inconvenient Overall Impression This projector offers high-quality visuals and is a great choice for movie and gaming experiences. However, potential issues with bulb longevity and the complexity of the Android TV interface may detract from its overall value. Despite these drawbacks, it remains a strong recommendation for those seeking an impressive upgrade in their home entertainment setup.