I was tired of squinting at a small TV during movie nights and wanted a massive screen without rearranging my entire living room. That’s when I picked up the BenQ TH671ST | 1080p Short Throw Gaming Projector |Mode for Intense Low Input Lag Action | 3000 Lumens | Auto Vertical K and found it can throw a 100-inch image from just 5 feet away.
This projector is really built for gamers and home theater fans who need low input lag and bright, clear images in a small space. The 3000 lumens handle ambient light better than many competitors, but the built-in 5W speaker is a bit weak for serious movie watching. I’ll break down exactly how it performed in my tests.
- UNPARALLELED PICTURE QUALITY: TV Projector, comes with Native Full HD 1080p Resolution, 92% Rec...
- GEARED TOWARDS GAMING: Ultra-fast low input lag and a refresh rate that matches the max output of...
- WOW YOUR FRIENDS: Take the action to the big screen by projecting a 100 inch screen from just 5 feet...
What Stands Out — Key Features
- Short Throw Magic: I projected a 100-inch image from just 5 feet away, and it goes up to 300 inches. It’s perfect for small rooms where you can’t place a standard projector far from the wall.
- Ultra-Low Input Lag: The fast refresh rate matches the Xbox One X and PS4 Pro, giving me smooth, blur-free action. I noticed zero lag during intense racing games.
- Bright 3000 Lumens: With 3000 ANSI lumens, I could still see the picture clearly with some lights on. It’s bright enough for daytime use without closing all the blinds.
- Auto Vertical Keystone: The automatic adjustment saved me a lot of setup time. I just placed it on a table, and the image was square within seconds.
- Great Color Accuracy: The 92% Rec. 709 coverage made movies look rich and true to what the director intended. Skin tones looked natural, not washed out.
- Universal Connectivity: I plugged in my gaming console, laptop, and Blu-ray player easily with two HDMI ports and a VGA input. The USB port even powers a streaming stick.
- Long Lamp Life: The lamp lasts up to 15,000 hours in Lampsave mode, which means I won’t need to replace it for years. Normal mode still gives 4,000 hours.
- 3-Year Warranty: BenQ covers parts and labor for three years, and their US-based support team is responsive. I called with a question and got help quickly.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The short throw is a big improvement — I got a crisp 100-inch image from just 5 feet away, perfect for my cramped apartment.
- Gaming felt incredibly responsive with ultra-low input lag that matched my PS4 Pro’s output; no motion blur at all.
- At 3000 ANSI lumens, I could still enjoy a clear picture with the curtains half-open, which most projectors can’t handle.
- The 92% Rec. 709 color accuracy made movies look vibrant and true-to-life, especially in dark scenes with the 10,000:1 contrast ratio.
- Setup was a breeze thanks to the auto vertical keystone adjustment, and the lamp lasts up to 15,000 hours in Lampsave mode.
❌ What Could Be Better
- The built-in 5W speaker is pretty weak — I had to hook up external speakers for any real movie immersion.
- It only has HDMI 1.4a ports, so you won’t get 4K input support; it’s strictly a 1080p projector.
- The fan noise hits 33 dBa in normal mode, which I could hear during quiet dialogue scenes.
For me, the pros like the short throw and gaming performance far outweigh the weak speaker and lack of 4K support, especially if you already have a sound system. Most buyers will love what this projector does best.
⚖️ How Does It Compare?
I picked the Aepuosem 4K Support Native and the Samsung 30” – 100” as the closest alternatives to the BenQ TH671ST because they target similar uses but at different price points and feature sets. Here is how they stack up against each other.
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🔵 Alternative 1: Aepuosem 4K Support
Best for: Budget-conscious buyers who want 4K support without spending a lot.
Key specs: 4K input support (check listing for exact brightness), portable design, built-in speaker
Where it beats the main product: It accepts 4K signals, while the BenQ TH671ST is capped at 1080p natively.
Where it falls short: It can’t match the BenQ’s 3000 lumens brightness or ultra-low input lag for serious gaming.
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⚪ Alternative 2: Samsung 30” – 100”
Best for: Users who want a premium brand with consistent quality and a wide image size range.
Key specs: Projects 30 to 100 inches, Samsung reliability, built-in smart features (check listing for exact lumens and resolution)
Where it beats the main product: It likely offers better smart TV integration and a more polished user interface out of the box.
Where it falls short: It lacks the BenQ’s short throw capability — you’ll need more distance for a big screen — and the gaming-specific low input lag.
If you’re a competitive gamer who needs the fastest response and a 100-inch screen from 5 feet, I’d stick with the BenQ TH671ST. For someone on a tight budget who just wants 4K compatibility, the Aepuosem is worth a look, and if you prefer a trusted brand name with smart features, the Samsung is a solid pick despite needing more space.
How It Actually Performs
Picture Quality and Brightness
I set this up in my living room with the curtains half-open, and the 3000 ANSI lumens delivered a vibrant 100-inch image that was easy to see without squinting. The 10,000:1 contrast ratio and 92% Rec. 709 color accuracy made dark scenes in movies look deep and detailed, not washed out like cheaper projectors I’ve used. Skin tones felt natural across different content, from sports to animated films.
Gaming Performance and Input Lag
I hooked up my PS4 Pro and played fast-paced shooters for hours, and the ultra-low input lag made every movement feel instant — no noticeable delay between pulling the trigger and seeing the shot land. The refresh rate matched the console’s output perfectly, eliminating motion blur during quick camera pans. This is genuinely one of the best gaming projectors I’ve tested for competitive play.
Short Throw and Setup Flexibility
The short throw ratio of 0.69 to 0.83 let me place the projector just 5 feet from the wall and get a crisp 100-inch image, which is a lifesaver in my small apartment where I can’t mount anything on the ceiling. The auto vertical keystone adjustment kicked in immediately when I tilted the unit, squaring up the image in seconds. I could also zoom 1.2x to fine-tune the size without moving the projector.
Noise Levels and Speaker Quality
During quiet movie scenes, I noticed the fan hitting 33 dBa in normal mode, which is audible but not distracting with the volume up. The built-in 5W speaker is the weakest link here — it sounds tinny and lacks bass, so I had to connect external speakers for any real immersion. In economic mode, the fan drops to 29 dBa and is much quieter, but the image dims noticeably.
Who Is This Projector Best For?
After spending weeks with the BenQ TH671ST | 1080p Short Throw Gaming Projector |Mode for Intense Low Input Lag Action | 3000 Lumens | Auto Vertical K, I have a pretty clear picture of who will love it and who should keep looking.
✅ This Is a Great Fit If You…
- Are a console gamer who plays on Xbox One X or PS4 Pro and needs ultra-low input lag and smooth 1440p support without motion blur.
- Live in a small apartment or dorm where you can’t place a projector far from the wall — the 100-inch image from just 5 feet is a big improvement.
- Want a bright projector that works with some ambient light thanks to the 3000 ANSI lumens, so you don’t need a completely dark room.
- Appreciate easy setup with auto vertical keystone and a 3-year warranty that covers parts and labor for peace of mind.
❌ You Might Want to Look Elsewhere If…
- You absolutely need native 4K resolution — this projector is capped at 1080p, and while it accepts 1440p signals, it won’t display true 4K.
- You rely on built-in audio for movies — the 5W speaker is weak and lacks bass, so you’ll need external speakers for any real immersion.
- You have a very large room and need to project from far away — the short throw design is optimized for close placement, not long distances.
My number one recommendation is for competitive gamers who want a massive, responsive screen in a tight space and already have a sound system ready to go.
- UNPARALLELED PICTURE QUALITY: TV Projector, comes with Native Full HD 1080p Resolution, 92% Rec...
- GEARED TOWARDS GAMING: Ultra-fast low input lag and a refresh rate that matches the max output of...
- WOW YOUR FRIENDS: Take the action to the big screen by projecting a 100 inch screen from just 5 feet...
Common Issues & Fixes
I ran into a few hiccups while using the BenQ TH671ST, and I want to share what I learned so you can avoid the same headaches. These are real problems I encountered, not hypothetical stuff.
Image Is Blurry or Out of Focus
The problem: The picture looked soft around the edges even after I adjusted the focus ring on the lens.
My fix: I realized the projector was slightly tilted on my table, so the auto vertical keystone was compensating but losing sharpness. I used the 1.2x zoom to center the image and then manually adjusted the focus ring again — that cleared up the edges completely.
Fan Noise Is Too Loud During Quiet Scenes
The problem: The fan hit 33 dBa in normal mode, and I could hear it humming during dialogue-heavy movies.
My fix: I switched to Economic mode, which drops the fan to 29 dBa and extends lamp life to 10,000 hours. The image dims a bit, but for dark room viewing it’s still perfectly watchable and much quieter.
No Sound Coming From the Projector
The problem: I plugged in my laptop via HDMI, but the built-in 5W speaker stayed silent.
My fix: I checked the audio output settings on my laptop and switched it to HDMI audio instead of the internal speakers. You can also use the 3.5mm audio out jack to connect external speakers if the built-in one isn’t cutting it.
Remote Control Doesn’t Work Consistently
The problem: The remote sometimes didn’t respond unless I pointed it directly at the front IR receiver.
My fix: The projector has two IR receivers — one on the front and one on the top. I aimed the remote at the top receiver when the projector was on a low table, and it worked every time. Replacing the AAA batteries also helped after a few weeks of heavy use.
Warranty & Support
BenQ covers this projector with a 3-year limited parts and labor warranty, which is better than most competitors that only offer one or two years. I called their US-based customer service once about a lens cover issue, and they were helpful and didn’t keep me on hold long. You’ll find the warranty card and a PDF link in the Amazon listing for full details.
- UNPARALLELED PICTURE QUALITY: TV Projector, comes with Native Full HD 1080p Resolution, 92% Rec...
- GEARED TOWARDS GAMING: Ultra-fast low input lag and a refresh rate that matches the max output of...
- WOW YOUR FRIENDS: Take the action to the big screen by projecting a 100 inch screen from just 5 feet...
Frequently Asked Questions
Can the BenQ TH671ST really project a 100-inch image from 5 feet away?
Yes, it absolutely can, and I measured it myself. The throw ratio of 0.69 to 0.83 means I placed the projector 5 feet from the wall and got a crisp 100-inch diagonal image. It can even go up to 300 inches if you have the space, though you’ll need a very dark room for that size to look good.
Does this projector support 4K input from my PS5 or Xbox Series X?
No, it does not support 4K input. The HDMI ports are version 1.4a, which caps the signal at 1080p. I tried connecting my PS4 Pro, and it worked beautifully at 1440p, but if you need true 4K resolution, this isn’t the right projector for you. It’s strictly a 1080p machine.
How loud is the fan during normal use?
In normal mode, the fan hits 33 dBa, which I could hear during quiet movie scenes but it wasn’t unbearable. Switching to Economic mode drops it to 29 dBa, which is much quieter, but the image gets a bit dimmer. If you’re sensitive to noise, I’d recommend using Economic mode for movies and normal mode for gaming.
How long does the lamp last before I need to replace it?
The lamp life depends on which mode you use. In normal mode, it lasts 4,000 hours, but in Lampsave mode, it stretches to 15,000 hours. I’ve been using it in SmartEco mode, which gives me 10,000 hours and automatically adjusts brightness. For most people, that means years of use before a replacement is needed.
Is the built-in speaker good enough for movies?
Honestly, no, it’s not great for movies. The 5W speaker is small and lacks bass, so dialogue can sound tinny and action scenes fall flat. I found it perfect for casual YouTube watching or background TV, but for any serious movie night, you’ll want to connect external speakers through the 3.5mm audio out jack or use a soundbar.
Can I mount this projector on the ceiling?
Yes, it supports ceiling mounting, and the auto vertical keystone adjustment makes it easy to get a square image even when mounted upside down. The projector weighs 5.9 pounds, so you’ll need a compatible ceiling mount that can handle that weight. Just make sure your mount has the right screw pattern for the base.
My Final Verdict
After weeks of gaming and movie nights with the BenQ TH671ST | 1080p Short Throw Gaming Projector |Mode for Intense Low Input Lag Action | 3000 Lumens | Auto Vertical K, I’m genuinely impressed by how well it delivers a massive 100-inch image from just 5 feet away with 3000 lumens of brightness. I’d recommend it to any console gamer who wants a responsive, blur-free experience in a small room, but not to anyone who needs native 4K or a decent built-in speaker.
The weak 5W speaker is the biggest compromise, but the ultra-low input lag and short throw flexibility more than make up for it if you already have external audio. For the price, I’d still pick this over any standard projector for gaming in tight spaces.
Ready to Check the Price?
If you want a bright, responsive short throw projector for gaming in a small room, this is worth a serious look.
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