Home » Optoma 4K400x 4K UHD projector (OPEN BOX)
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma 4K400x 4K UHD projector - Protech Projection Systems
Optoma

Optoma 4K400x 4K UHD projector (OPEN BOX)

SKU: 4K400x
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$1,090.00
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Frequently Asked Questions

The best 4K laser projector for a classroom, office, or mixed-use room should combine true 4K detail, enough brightness for lights-on viewing, and flexible connections for multiple devices. For many buyers, the key specifications are native or true 4K UHD resolution, at least strong mid-to-high brightness, HDR support, and simple integration with laptops, media players, and room control systems. The Optoma 4K400x fits that use case well because it offers True 4K UHD resolution, 4000 lumens for brighter environments, dual HDMI inputs, USB power for streaming devices, audio connections, a 12V trigger, and RS232 for control integration. It also supports HDR10 and HLG, which helps improve visible detail and texture in compatible content. This type of projector is a strong fit for presentations, training rooms, digital media, and shared spaces where image clarity matters. The main tradeoff is that it is not a short throw or ultra short throw model, so buyers should still confirm room depth and mounting position before choosing it.
Yes, a 4K laser projector is usually better than a standard 1080p projector when you need finer detail, sharper text, and more realistic images. The biggest difference is resolution. True 4K UHD displays 8.3 million pixels, which is four times the detail of Full HD. That can make spreadsheets, detailed graphics, small text, and high-resolution video easier to read and more comfortable to view on a large screen. The Optoma 4K400x is designed for exactly that kind of use. It delivers True 4K UHD resolution and 4000 lumens, so it is better suited than many 1080p models for classrooms, conference rooms, and spaces where ambient light is present. It also supports HDR and HLG for more depth and texture in compatible video content. A 1080p projector can still be enough for basic slides or simple video. But if you expect mixed use, including presentations, streaming, detailed visuals, or occasional gaming, a 4K model like this is the better long-term choice.
Yes, it can work well in a cinema-style room, especially if you want true 4K detail and HDR compatibility without limiting the projector to a fully dark space. The Optoma 4K400x offers True 4K UHD resolution, HDR10 and HLG support, and color adjustment features such as a Color Management System and ISF day and night modes. Those features help create a more refined image for movies and streaming. It is also practical for flexible home use because it includes dual HDMI inputs, a built-in speaker, and USB power for a streaming dongle. That makes it easy to connect a media device without adding much extra hardware. The main consideration is room type. This model is better described as a bright, versatile 4K projector than a dedicated dark-room-only theater unit. Buyers who want cinema performance in a living room, media room, or multi-purpose space will likely appreciate the 4000-lumen brightness. If your priority is ultra-close placement to the wall, however, you would want a short throw or ultra short throw projector instead.
No, the Optoma 4K400x is not described as a short throw projector or an ultra short throw projector. It is a standard-throw 4K laser projector designed for bright classrooms, offices, and general large-screen viewing where you have more flexibility in placement distance. That matters because throw type affects installation. A short throw projector is designed to create a large image from a shorter distance, while an ultra short throw projector can sit very close to the wall or screen. Those models are often preferred in smaller rooms, interactive spaces, or areas where you want to reduce shadows and cable runs near the audience. The 4K400x is a better fit when you want true 4K resolution, 4000-lumen brightness, and broad connectivity, and your room can support standard placement or ceiling mounting. Before buying, it is smart to confirm screen size, room depth, and mounting position. If your room is shallow, a short throw model may be the better category to shop.
For rooms with ambient light, a 4K laser projector should generally have enough brightness to keep text, graphics, and video visible without washing out the image. In practical terms, 4000 lumens is a solid level for classrooms, meeting rooms, and multi-use spaces where total light control is not possible. The Optoma 4K400x is rated at 4000 lumens, which makes it well suited for lights-on viewing compared with lower-brightness home-focused projectors. That brightness level helps preserve clarity for presentations and also supports casual video use in spaces that are not fully dark. Combined with True 4K UHD resolution, it can maintain better perceived detail in environments where weaker projectors may look dull or soft. The tradeoff is that brightness alone does not guarantee the best image. Screen type, room lighting, and projector placement also matter. If your room has very strong ambient light or an especially large screen, some buyers may want to step up to a higher-lumen large venue projector category.
Yes, this projector can work well for gaming, especially if you want a large-screen experience and also need a projector for work or media. The key gaming feature is support for 1080p at 240Hz with an ultra-low 4.2ms input lag when connected to a PC. That makes it notably more responsive than many projectors designed only for movies or presentations. For competitive or fast-action gaming, those specifications are important because lower input lag helps controls feel more immediate. For immersive single-player games, the projector also offers True 4K UHD resolution for detailed visuals when you prioritize image sharpness over high-refresh play. This model is a particularly good fit for users who want one projector for mixed use: presentations, video, and gaming. The main limitation is that the highest refresh gaming mode listed is tied to 1080p on PC, so buyers focused only on top-end competitive performance should verify their preferred resolution and source setup before buying.
This projector supports a wide range of common devices. The Optoma 4K400x includes dual HDMI inputs, audio connections, USB power for 5V devices, a 12V trigger, and RS232. That means you can connect laptops, desktop PCs, game consoles, Blu-ray players, media streamers, and set-top boxes with standard HDMI connections. It is also easy to use with streaming accessories because the USB-A port can power an HDMI dongle. That is useful if you want to add a smart streaming device without needing a separate power adapter. In office or classroom settings, the RS232 and 12V trigger can also help with room integration and automation. This level of connectivity benefits buyers who need one projector to serve different roles, such as presentations during the day and video playback after hours. The main point to check is your source mix. If your setup depends on specialized inputs beyond HDMI-based workflows, confirm compatibility before installation.
Yes, this projector is a strong fit for classrooms and conference rooms where image clarity and brightness are priorities. The Optoma 4K400x is designed for spaces that need detailed visuals even when total ambient light control is not possible. Its 4000-lumen output supports lights-on viewing, while True 4K UHD resolution helps make text, charts, and fine details easier to see on a large screen. It also includes practical business and education features such as dual HDMI inputs, audio connections, USB power, a 12V trigger, and RS232 for integration with existing control systems. Four corner correction can help square the image when installation is less than ideal, which is helpful in real-world classrooms and meeting spaces. This projector is best for users who want one model that handles both detailed content and room flexibility. The main tradeoff is installation distance. Because it is not a short throw model, you should confirm that the room layout allows standard projector placement.
Yes, HDR can matter on a 4K projector because it improves how compatible content looks by revealing more visible detail, texture, and depth. HDR is not just about brightness. It also helps highlights, shadows, and color gradations appear more natural when the source supports it. The Optoma 4K400x supports both HDR10 and HLG. HDR10 is common in movies, streaming, and many modern video sources, while HLG is often used in broadcast and other compatible content workflows. In practice, this means the projector can display a wider range of visual information from supported sources, making objects look more solid and lifelike. This benefits buyers who plan to use the projector for both professional content and entertainment. It is especially useful if you watch modern 4K video or present high-quality visual media. The main limitation is that HDR performance always depends on the source material, room lighting, and overall setup, not just the projector specification alone.
Open box usually means the projector is not factory-sealed retail stock, but it is still being sold as a new or like-new unit rather than a heavily used product. For many buyers, open box can be a practical way to get the same core performance and features as standard stock, provided the condition and warranty are clearly stated. In this case, the Optoma 4K400x is listed as open box, brand new, and covered by a full warranty. That matters because the important question with any open box projector is not just whether the carton was opened, but whether the unit still includes proper support and should perform to the original product standard. This can be a good option for buyers who want true 4K UHD resolution, 4000-lumen brightness, HDR compatibility, and full connectivity without compromising on functionality. The smart buying step is to confirm exactly what accessories are included and verify the warranty terms before installation.

Optoma 4K400x 4K UHD projector

***OPEN BOX BRAND NEW FULL WARRANTY ONLY ONE LEFT AT THIS PRICE**

Overview

Future proof your classroom or office space with this high brightness True 4K UHD projector.  The 4K400x projects the finest of details in any environment even when total ambient light control is not possible.  This projector boasts dual HDMI ports, audio connections, USB to power 5V devices, 12V trigger and an RS232 to integrate into your existing control solution.  In addition, when needed, enjoy 1080p in 240Hz with 4.2ms input lag when connected to a PC.

Key Features

  • True 4K UHD resolution
  • HDR and HLG compatible
  • Lights on viewing
  • 4000 lumens for bright images in any environment
  • Extensive connectivity
  • Dual HDMI ports, audio connections, USB power, 12V trigger and RS232
  • Impressive visual performance
  • Supports 1080p 240Hz with an ultra-low input lag of 4.2ms
  • User Manual
  • Datasheet

True 4K UHD resolution

Ultra HD 4K resolution delivers sharper, life-like images and richer colors - allowing you to sit closer to the screen and enjoy a more immersive experience.

Our DLP projectors provide CTA (Consumer Technology Association) approved True 4K UHD resolution, capable of projecting 8.3 million on screen pixels. That's four times more detail than Full HD and twice as many from competing technology, which only delivers 4.1 million pixels.

True 4K UHD resolution

HDR and HLG compatible

Capable of receiving and displaying both HDR10 and Hybrid Log Gamma (HLG) HDR content. This Optoma projector allows you to see far more detail and texture. Objects look more solid and lifelike and the extra detail creates a greater sense of depth.

HDR and HLG compatible

Dual HDMI inputs

Play games, stream videos and share photos on the big screen in the comfort of your own home. With dual HDMI inputs, you can easily connect to your games console, set-top box, laptop, PC, Blu-ray player or media streamer with a single cable. You can even turn it into a smart projector by connecting an HDMI dongle like the Google Chromecast™, Amazon Fire TV, Apple TV™ or Roku® stick.

Color Management System (CMS)
Display accurate lifelike colors to best match your viewing environment. This unique feature provides you with the flexibility to fine-tune the color settings for optimal precision.

ISF modes
This feature allows you to save your calibrated day and night mode settings for the highest possible viewing experience.

Integrated speaker
Complete your home entertainment experience with the convenience of a powerful built-in speaker for exceptional sound quality and an easy set up without the need for costly external speakers.

USB-Power
Use the USB-A port to power an HDMI dongle, such as Google Chromecast.

Four corner correction
Adjust the keystone in both the vertical and horizontal plane. You can individually warp each corner of the image to create a perfectly square image. Ideal for uneven walls or where projector placement is awkward and needs to be installed at an angle. 

Backlit remote
Our backlit remotes are designed using subtle white LEDs to light up the buttons, making it to see and operate, especially in the dark.

The Optoma 4K400x 4K UHD Projector is the perfect solution for classrooms and meeting spaces that require high brightness and exceptional image quality. This projector is designed to future-proof your space, allowing you to project the finest of details even in environments where total ambient light control is not possible.

Equipped with dual HDMI ports, audio connections, USB to power 5V devices, 12V trigger, and an RS232, the Optoma 4K400x seamlessly integrates into your existing control solution. Whether you need to connect to a PC or other devices, this projector provides extensive connectivity options.

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