BenQ HT3550 Review: Mid-Range Projector Compared

The BenQ HT3550 is a frequently searched benchmark in the mid-range projector market , but the three BenQ models that compete for attention in this tier are actually the TH575, TK700, and TH671ST. Each targets a different buyer with different room constraints. Understanding which one fits your setup requires more than comparing spec sheets.

Projector selection in this category involves real trade-offs between resolution, input lag, throw distance, and light output. The projector you choose needs to match your room, your source material, and how you primarily use the screen , gaming, movies, or both.

Quick Verdict

The BenQ TK700 is the strongest all-around performer here for buyers who want native 4K with low input lag. The BenQ TH575 is the practical choice for a dedicated 1080p gaming setup where brightness and warranty coverage matter more than pixel count. The BenQ TH671ST earns its place for rooms where throw distance is the binding constraint , it is genuinely short-throw, not merely a marketing label.

None of these units approach the image quality ceiling Adrian’s Epson 4010 occupies. They are lamp-based projectors at a lower price band, and that positioning sets realistic expectations before you read any further.

Key Specs at a Glance

| | TH575 | TK700 | TH671ST | |, |, |, |, | | Resolution | 1080p native | 4K UHD native | 1080p native | | Lumens | 3800 | 3200 | 3000 | | Input Lag | 16.7ms (1080p) | 16ms (4K) | 8.3ms (1080p) | | Throw Ratio | 1.5, 1.66:1 | 1.5, 1.66:1 | 0.69:1 (short) | | HDR | HDR10 | HDR10 | HDR10 | | Light Source | Lamp | Lamp | Lamp | | Zoom | 1.1x | 1.1x | No optical zoom | | Warranty | 3 years | 2 years | 2 years |

All three are lamp-based. Expect 4,000, 6,000 hours of lamp life under normal use conditions, with replacement lamps available from BenQ. Laser units in this tier don’t exist at this price band , that light-source longevity advantage only appears as you move up the market.

Performance

Resolution and Image Quality

The TK700’s native 4K panel produces a meaningfully sharper image than the two 1080p units. Text on menus, fine textures in games, and film grain on 4K Blu-ray all resolve with more precision. The TH575 and TH671ST deliver clean 1080p output but cannot match that detail ceiling.

HDR performance is consistent with the category: all three support HDR10, and none of them have the peak brightness to fully realize HDR highlights the way a high-brightness dedicated home theater unit would. Owner reports on AVS Forum note the TK700 handles HDR-to-SDR tone mapping better than most lamp-based units in this range, which keeps highlights from clipping.

Input Lag

These units were designed with gaming in mind, and the lag numbers show it. The TH671ST’s 8.3ms figure at 1080p is the fastest of the three , verified by Projector Central measurements , making it the strongest candidate for competitive gaming. The TK700’s 16ms at native 4K is genuinely usable for most gaming applications. The TH575 at 16.7ms is within practical range for all but the most latency-sensitive play styles.

None of these numbers are theoretical: they reflect Game Mode enabled, which disables certain image processing stages. With Game Mode off, lag increases significantly on all three units.

Brightness and Room Compatibility

The TH575’s 3800 lumens is the highest rated output in this group. Owner reports consistently note that it holds up in moderately lit rooms where the TH671ST and TK700 show more washout. That brightness advantage is real, but it comes with a trade-off , high-lumen lamp modes in projectors of this class often run warmer and louder.

The TH671ST’s 3000 lumens in a short-throw configuration creates a specific use case: a bright image in a room where the projector must sit close to the screen. Verified buyer reports note that at a 1.5-meter throw distance, the TH671ST produces a usable 100-inch image with enough output for an ambient-light living room , not ideal, but functional.

Top Picks

BenQ TH575 1080p Indoor Gaming Projector

The BenQ TH575 leads with 3800 lumens and a three-year warranty , the highest brightness and longest warranty in this group. At a standard 1.5, 1.66:1 throw ratio, it fits conventional room setups comfortably: a 100-inch image at roughly 10, 11 feet from the screen.

Native 1080p at this brightness level produces a sharp, punchy image in rooms with some ambient light. Owner reports from verified buyers call out strong color saturation out of the box and a responsive Game Mode that keeps input lag at 16.7ms. The three-year warranty coverage is not a minor point , lamp-based projectors do fail, and BenQ’s three-year term here provides meaningful coverage that the other two units don’t offer.

The trade-off is resolution. Against the TK700’s native 4K, the TH575 shows its pixel structure on large screens. If the primary source is 4K content , streaming, Blu-ray, PS5 output , the 1080p ceiling becomes visible. For buyers whose primary use is 1080p gaming or standard streaming, the brightness and warranty combination makes the TH575 the pragmatic choice in this group.

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BenQ TK700 4K Gaming Projector

The BenQ TK700 is the only native 4K unit in this group, and that distinction earns it the top position for buyers whose rooms and screen sizes can reveal the resolution difference. Native 4K , not pixel-shifted, not upscaled , at 16ms input lag in 4K game mode is a combination that few projectors in this price band deliver.

At 3200 lumens, the TK700 is slightly dimmer than the TH575. That gap is manageable in a dark room but becomes relevant in moderately lit environments. The standard 1.5, 1.66:1 throw ratio mirrors the TH575, so room placement requirements are comparable. Owner consensus on AVS Forum supports positioning the TK700 on a darker, more controlled room , it performs best where light control is respected.

The Dolby Atmos 5W built-in speaker is a marketing line, not an endorsement. An 5W chamber speaker cannot produce anything approaching Atmos spatial audio. The included speaker is functional for casual use; anyone building a proper room will connect to an AV receiver. The two-year warranty (versus the TH575’s three years) is worth noting as a comparison point.

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BenQ TH671ST 1080p Short Throw Gaming Projector

The BenQ TH671ST earns consideration on a single differentiating factor: its 0.69:1 short throw ratio. That number means the projector can produce a 100-inch image from roughly 4.5 to 5 feet away. For rooms where ceiling mounting at a conventional distance isn’t possible , small bedrooms, apartments with furniture constraints, rooms with obstructions , this changes the placement calculus entirely.

At 8.3ms input lag with Game Mode enabled, the TH671ST is the fastest of the three units measured. AVS Forum owner reports note that competitive gamers who have committed to a short-throw setup specifically for this lag spec call it meaningfully responsive. The trade-off against the other two units is real: 3000 lumens is the lowest in the group, there is no optical zoom (placement precision matters), and the resolution ceiling is 1080p native.

Short-throw projectors require more precise screen alignment than standard throw units. The lack of optical zoom means the image size is almost entirely determined by distance , small placement errors create visible geometry issues. Auto vertical keystone is present, but keystone correction degrades optical sharpness. The stronger approach is to get placement right and disable keystone correction entirely.

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Buying Guide

Throw Distance First

Room geometry is the non-negotiable constraint. Before any other consideration, measure the available throw distance in your room , the distance from the lens position to the screen surface. Standard throw projectors like the TH575 and TK700 require roughly 10, 12 feet for a 100-inch image. The TH671ST delivers the same image size at under 5 feet. Getting this calculation wrong means the projector physically cannot produce the image size you want. Projector Central’s throw distance calculator is the correct tool for this step.

Lamp Life and Replacement Costs

All three units are lamp-based. Plan for lamp replacement at 4,000, 6,000 hours depending on brightness mode. BenQ lamp replacements are available directly and through third-party vendors. The TH575’s three-year warranty covers more of that lamp lifespan than the two-year terms on the TK700 and TH671ST. For buyers who will run the projector several nights per week, lamp longevity is a genuine budget consideration that doesn’t show up in the purchase price.

Resolution vs. Brightness Trade-Off

The TK700’s 4K native resolution is the ceiling of this group. But 4K is only visible if the screen is large enough, the viewing distance is close enough, and the content source is actually 4K. On a 100-inch screen at 12 feet, the difference between native 4K and sharp 1080p is visible but not dramatic for casual viewing. For gaming where fine textures matter, or for 4K Blu-ray on a 120-inch screen, the TK700’s resolution advantage is meaningful. At smaller screen sizes or longer seating distances, the TH575’s brightness advantage can produce a more visibly punchy image than the TK700’s quieter output.

The Screen Is Not an Accessory

This is the point that consistently gets inverted in purchasing decisions: the screen matters as much as the projector. An average projector on an excellent screen produces a better image than an excellent projector on a basic white wall or a low-gain flat screen. This is not a minority opinion , it is the consistent finding from the projector owner community across every forum that covers the category. Budget accordingly. A high-quality ALR or gain screen paired with the TH575 will outperform the TK700 on a bare wall for ambient-light viewing.

Input Lag and Gaming Use Cases

Game Mode must be enabled to achieve the rated lag figures on all three units. With processing active, lag climbs significantly. The TH671ST at 8.3ms is competitive with dedicated gaming monitors for most non-tournament play. The TK700 at 16ms in 4K game mode covers the majority of console gaming scenarios , PS5 and Xbox Series X game mode lag tolerance is well above 16ms for most titles. The TH575 at 16.7ms is indistinguishable from the TK700 in practice. If sub-10ms lag is a requirement, the TH671ST is the only unit in this group that meets it.

Who It’s For

BenQ TH575: Buyers prioritizing brightness, warranty coverage, and a standard room setup. The right answer for 1080p gaming in a room with some ambient light.

BenQ TK700: Buyers with dark room control who want native 4K at a mid-range price and can tolerate the lower brightness ceiling. The strongest all-around pick if the room supports it.

BenQ TH671ST: Buyers with genuine short-throw placement constraints. The fastest input lag in the group is a secondary benefit; the primary reason to choose this unit is room geometry.

None of these is the right answer for buyers building a reference home theater. That use case , like Adrian’s own 7.1.2 Atmos room , belongs to a different tier. For a structured guide to the broader category, the full home projector hub covers the range from budget entry points through mid-tier options.

Frequently Asked Questions

Is the BenQ TK700 worth choosing over the TH575 for gaming?

The TK700’s native 4K is the meaningful difference for gaming on large screens with 4K sources. If the primary platforms are PS5 or Xbox Series X outputting 4K, the TK700 resolves that content with more detail. The TH575 is brighter and carries a longer warranty, making it the stronger choice for rooms with ambient light or buyers prioritizing ownership coverage. Both have comparable throw requirements and practical input lag.

How much room do I need for the BenQ TH671ST’s short throw?

The TH671ST’s 0.69:1 throw ratio produces a 100-inch image at roughly 4.5 to 5 feet from the screen. There is no optical zoom, so image size is determined almost entirely by distance , exact placement matters more than with standard throw units. Projector Central’s throw calculator is the most reliable tool for verifying your specific screen size at your specific distance before purchasing.

Do all three BenQ projectors support HDR?

All three support HDR10. None of them have the peak brightness to fully realize HDR highlights in the way that high-output laser units do. In practice, HDR content is tone-mapped to the projector’s luminance range , the TK700 handles this mapping more cleanly than the other two units according to owner reports, keeping highlights from visibly clipping on bright scenes.

What lamp life should I expect, and how does that affect long-term cost?

Expect 4,000, 6,000 hours depending on brightness mode used. At four evenings per week averaging three hours per session, that translates to roughly four to six years before replacement. BenQ replacement lamps are available from the manufacturer and third-party vendors. The TH575’s three-year warranty covers potential lamp failure during the early ownership period; the TK700 and TH671ST carry two-year terms.

Does keystone correction affect image quality on these projectors?

Keystone correction degrades optical sharpness on all projectors that apply it digitally, which includes all three of these units. Auto vertical keystone is a convenience feature for quick setup, not a substitute for proper placement. For the best image quality, position the projector at the correct height relative to the screen and disable keystone correction. On the TH671ST specifically, precise placement is more critical because there is no optical zoom to compensate for positioning errors.