BenQ HT4550i

Source: What HIFI? added 23rd Aug 2023

  • benq-ht4550i

The HT4550i is fantastically bright, colorful and sharp – but these strengths come with one or two strings attached


  • +

    Spectacularly vibrant colors

  • +

    Extremely bright

  • +

    Good HDR tone mapping


  • Can struggle with black levels

  • Wide Color mode limits light controls

  • No advanced gaming features

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The BenQ HT4550i is the most home theater-focused model from a new three-strong projector range by the Taiwanese brand that also includes the more living room-focused HT3560i and the more home entertainment (rather than home theater) based TK860i. 

The HT4550i is designed for use in a heavily darkened if not fully blacked out room, and while it’s easy enough to set up if you want to store it in a cupboard when you’re not using it, we’d recommend leaving it permanently installed in a dedicated movie/gaming room if possible.

The main home theater selling points of its DLP projection engine are its 4K resolution, extreme 3200 lumens of light output from a long-life four-LED lighting system, advanced light controls, and most eye-catchingly of all, claimed coverage of the full 100 per cent of the DCI-P3 digital color spectrum used in the commercial movie theater world.


(Image credit: What Hi-Fi?)

The BenQ HT4550i’s $2999 price makes it a fairly high-end model by BenQ standards – a status confirmed by BenQ targeting it at the relatively demanding home theater enthusiast market rather than more casual users. 

BenQ’s most recently announced new ‘living room’ projectors, the TK860i and HT3560i, aren’t far off half the price of the HT4550i. As we’ll see, though, the HT4550i has both performance and longevity features that justify that price difference pretty well.


(Image credit: What Hi-Fi?)

The HT4550i treads the style line between ‘serious home theater’ and ‘living room friendly’ very nicely. Its matte black finish helps it disappear into the sort of blacked-out room it’s designed for, while the lens recessed into its front left side is large enough to raise hopes of more precise, geometrically correct and refined images than you might expect to get with cheaper home entertainment projectors.

Its rounded edges and smart cooling grille design also ensure it doesn’t uglify a living room, though, and although it’s bigger than BenQ’s HT3560i and TK860i, it’s still small enough to fit comfortably on most coffee tables.

One unusual aspect of its design is the elongated square bulge that runs along a section of its rear. This turns out to be a detachable cover over a bay where you can insert a provided smart dongle that adds built-in wi-fi and video streaming features to the HT4550i’s specification. We’ll cover this more in the next section.

Wrapping the design up is an attractive gloss-white remote control that boasts backlit buttons and a nice, spacious button layout. One or two aspects of the remote’s layout take some getting used to, but overall it’s a better handset than those you get with most projectors.


(Image credit: What Hi-Fi?)

The BenQ HT4550i is a single-chip DLP type of projector, illuminated by a four-LED lighting system. This lighting system is significant because, unlike traditional projector lamps, LEDs don’t have to be replaced anywhere near as often as regular UHP lamps (those in the HT4550i are rated for 20,000 hours), and don’t degrade as fast. So you’ll save money on replacement lamps, and spend less time watching diminished picture quality.

As we’d expect, the HT4550i claims to be a 4K model. As with all home theater DLP projectors, that doesn’t mean the HT4550i actually carries 3840×2160 tiny digital mirror devices on the back of its controller chip. Instead it ‘flashes’ a lower mirror count multiple times per frame of a 4K source to create what appears to your eyes to be a 4K image. 

Some will argue this means the HT4550i isn’t truly a 4K projector, but the Consumer Technology Association in the US would disagree.

BenQ HT4550i tech specs

(Image credit: What Hi-Fi?)

Bulb technology Four-LED

Projection technology DLP

Dimensions 5.3″ x 17″ x 12″

Native resolution 3840 x 2160 via double flashing

Screen size Up to 200in with Clear Focus feature, 300-inch absolute maximum

Input lag 18.1ms

The HT4550i supports high dynamic range (HDR) sources in the HDR10, HLG and, surprisingly, HDR10+ formats. The HDR10+ system, if you’re not familiar with it, adds extra scene-by-scene image data to the video stream to help compatible displays deliver more refined and accurate results.

Most HDR sources are also mastered with wide color gamuts. So it’s exciting to find the HT4550i joining the still-limited ranks of projectors equipped with a wide color filter. Called in by a dedicated Wide Color option in its menus, this filter is claimed to expand the projector’s color coverage to a claimed 100 per cent of the DCI-P3 color gamut used in the digital theater world. While it’s getting reasonably common now to find projectors covering 100 per cent of the Rec709 standard dynamic range format, full DCI-P3 coverage remains rare.

Color filters inevitably lead to some dimming of the image – that’s why they’re always options rather than being left ‘permanently on’. The BenQ HT4550i, though, has tried to counter this issue by providing the HT4550i with a seriously high 3200 lumens of claimed peak brightness. 

This much brightness can also help the HT4550i punch through ambient light in a non-blacked-out room, of course. However, given the projector’s self-professed focus on home cinephile audiences, we’d recommend thinking of the brightness as being more about enhancing both the HT4550i/s HDR impact and wide color filter performance in a fairly dark room setting.

To further enhance the HT4550i’s HDR efforts, BenQ has equipped it with an HDR-Pro technology that combines hardware control of the four-LED light system, a dynamic iris, new Dynamic Black software and a Local Contrast Enhancer processor that breaks the image down into hundreds of separate analysis zones to help it more accurately optimize its light output for every image frame.

The HT4550i benefits, too, from BenQ’s CinematicColor system, meaning it arrives in your home having already received an in-factory calibration. The tools are still provided to enable you to get a new full calibration done if you wish, though, along with a few image processing options that include a sharpness booster, a skin tone enhancer, and a 4K Motion Enhancer.

The HT4550i’s connections are par for the projector course, with highlights being two HDMI ports (plus the separate bay for the smart ‘dongle’), a 12V trigger jack, an RS232C port for adding the projector to a wider home theater control system, and a pair of USBs. One of these USBs can provide power for video dongles that need it, while the other supports multimedia playback. You can also play multimedia from Macs, Chromebooks, Chrome browsers, iOS devices and Android devices thanks to a Wireless Projection feature.

The HT4550i actually has one HDMI port fewer than the cheaper HT3560i, though – and also, in a disappointment for gamers, neither of its HDMIs support frame rates higher than 60Hz. 

Finally, the smart dongle we keep mentioning (and which accounts for the ‘i’ at the end of the HT4550i’s name) delivers an Android TV smart system, complete with voice control and nativized versions of most of the world’s main video streaming apps.


(Image credit: What Hi-Fi?)

The HT4550i set our pulse racing immediately with what are the most vibrant and sharp pictures we’ve seen from any projector at this level. Including the occasional models at this price that use laser lighting systems. 

With the Wide Color mode in action and a bright, colorful HDR image on the screen, the combination of the projector’s expanded color range and exceptionally high brightness injects a level of life and three-dimensional realism into the picture that adds up to one of the most convincing HDR experiences we’ve had with any projector – even taking into account much more expensive models.

There’s nothing forced about either the extreme color punch or surprisingly high (for a projector mode with a color filter in play) brightness, either. On the contrary, the exceptional color and brightness simply help to make the picture look more realistic.

Relatively pure blues, greens and especially reds benefit particularly greatly from the color filter, but not in a way that leads to any specific tones standing out from the rest of the picture to an unnatural degree. Every hue ultimately benefits from the HT4550i’s color filter – and the color tuning that’s been designed around it.

The HT4550i’s unusually expressive color volume joins with some phenomenal sharpness to deliver a fantastically expressive picture, too. Any lingering doubts you might have about whether the HT4550i delivers a true 4K experience are quickly forgotten. 

Native HD content looks dense, detailed and believable too, with no lag, excessive noise or other distracting reminders of its ‘upscaled’ nature.

If by some miracle you only find yourself watching HDR films that are really bright all the time, you can consider the HT4550i an unmitigated five-star triumph. There’s no projector out there that handles such content better for this money. Unfortunately, though, things get a bit more complicated when what you’re watching turns to the dark side.

During dark scenes, especially with the color filter in play, it’s immediately apparent that delivering the sort of brightness BenQ wanted to maintain with the HT4550i’s color filter in play has compromised black levels. Parts of the image that should look black or very dark instead look a fairly light grey, making them feel a little artificial and flat. Especially relative to the three-dimensional, immersive look of bright scenes. 

The greyness can slightly discolor some tones during mostly dark scenes too, as well as leading some subtle shadow detailing to become lost in the general murk.

You can improve black levels a bit by changing the lamp output setting to Eco from its Normal default with HDR sources, but this also removes a pretty substantial chunk of the brightness that makes the HT4550i so impressive with bright HDR scenes.

There is one other way to improve the HT4550i’s black level (and contrast) performance – but it only becomes available if you first turn off the Wide Color filter. With the filter off you can access an extra lamp control option called Smart Eco which, it turns out, automatically adjusts brightness to best suit the requirements of the image being shown at any given moment. This doesn’t make so much of a difference that black levels suddenly become really good, but aside from some rare and subtle moments of brightness instability, it certainly makes the picture look more balanced and, at least where contrast is concerned, cinematic. Except, of course, that the image’s color is no longer as vibrant and expressive as it was with the Wide Color filter in play.

In other words, the HT4550i presents you with a frustrating conundrum where you have to pick between a setting that’s best for contrast and a setting that’s best for color, and there’s no way we could find to get the best of both worlds at the same time. 

The most consistently engaging and immersive images over the cumulative running time of a selection of movies was actually arguably achieved with the color filter left off. Though, on the upside, this is partly because even without the Wide Color filter in place the HT4550i’s colors still look good for such a bright, sharp home theater projector that’s now giving us more contrast.

Now that we’ve been talking about the HT4550i’s picture set-up issues, we might as well discuss a couple of other problems with the projector, too. Starting with a little more obvious appearance than we’d like of the rainbow effect, where stripes of red, green and blue flit momentarily but quite aggressively over bright highlights within dark images. 

The other issue is that the Filmmaker Mode the HT4550i provides is weirdly poor, at least for HDR content, leaving dark HDR scenes looking so greyed-over that at times you can scarcely make out what’s going on. To be fair, BenQ only specifically recommends the HT4550i’s Filmmaker Mode with SDR content, with which it is indeed more watchable. But we wouldn’t normally expect the Filmmaker Mode to be such a bust with HDR.

The HT4550i deserves overall, though, to have us finish our assessment of its pictures on a high. So let’s do so by saying that even without 4K/120Hz support, it delivers a mostly excellent gaming experience. Its extreme brightness and color potential together with its pristine sharpness and a good 18.1ms response time when running in its Fast Response mode help it get huge and responsive impact from the latest HDR games consoles and PCs. 

Gaming also reminds us to mention that the projector handles motion well too, even without any help from its motion processing system, regardless of whether it’s playing a 24p film or 60Hz game. 

The only time the HT4550i’s gaming experience stumbles is, again, with areas set in very dark environments, where the limited black levels return to the equation.


(Image credit: What Hi-Fi?)

It’s by no means a given that a relatively serious home theater projector like the BenQ HT4550i will carry a built-in sound system. The HT4550i boasts one built on a speaker design developed by BenQ’s Trevolo audio division. 

It’s only a single 5W affair rather than the 2 x 5W system found in BenQ’s HT3560i and TK860i models, but it manages to produce a decent dynamic range by projector sound standards without becoming harsh in the trebles or boxy in the bass. It can get loud enough to always be intelligible even in quite a large rooms, too, and comfortably drowns out the (mild) noise made by the projector’s cooling fans.

The sound doesn’t have enough power or projection, though, to escape from the HT4550i’s bodywork to the same extent the HT3560i’s sound does, meaning that its audio appears more dislocated from the onscreen action. 


(Image credit: What Hi-Fi?)

There are times – many of them – where the BenQ HT4550i is a dazzlingly good picture performer. Its brightness, sharpness and, especially, wide color capabilities take HDR to places projectors at this price are not supposed to go. 

It’s a pity there’s a black-level cost to all the grand spectacle, and frustrating that you can’t get the projector’s best contrast performance at the same time as its best color performance. If brightness, color and sharpness matter more to you than contrast, though, there’s nothing else that delivers those goodies better at this price.


  • Picture 4
  • Sound 4
  • Features 5


Read our review of the Optoma UHZ50

Also consider the LG CineBeam HU715Q

Read our Epson EH-TW9400 review

Best projectors: Full HD, 4K, portable and short-throw

What Hi-Fi?, founded in 1976, is the world’s leading independent guide to buying and owning hi-fi and home entertainment products. Our comprehensive tests help you buy the very best for your money, with our advice sections giving you step-by-step information on how to get even more from your music and movies. Everything is tested by our dedicated team of in-house reviewers in our custom-built test rooms in London, Reading and Bath. Our coveted five-star rating and Awards are recognised all over the world as the ultimate seal of approval, so you can buy with absolute confidence.

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