The AAXA 4K1 Ultra HD Mini Projector stands out both for its relatively low price ($999) and its level of portability for a 4K (3,840-by-2,160-pixel) home entertainment projector. The 4K1, like the AAXA M7 reviewed here recently, is larger than the pico or palmtop-size projectors the company is best known for and arguably too heavy to qualify as "mini," despite its name. But it's designed to be portable and comes with a carrying case, which makes it of obvious interest if you're looking for a 4K projector that can be taken from room to room or place to place. Its image quality doesn't dazzle, but it occupies an appealing intersection of price, size, and capability.

High Resolution, Plus High Brightness, for the Size

The AAXA 4K1 is built around a DLP chip that uses TI's XPR fast-switch pixel shifting to put 3,840 by 2,160 pixels on screen. The imaging chip is paired with an RGBB LED light source rated for 30,000 hours of life in Eco mode. (AAXA provides no published lifespan for the projector light source if used in full-power mode.)

Unfortunately, its rated brightness of 1,500 LED lumens isn't helpful for comparing to other projectors, since there's no LED lumen standard. After setting the 4K1 for its best image quality, I'd call it roughly equivalent to what I expect from 600 ANSI lumens. That said, keep in mind that, as with almost any projector, the best image quality is not the brightest. The full-power mode, called Boost, does what its name implies by boosting brightness, but that comes at the expense of increasing color errors that are noticeable even in Standard power mode, making them harder to ignore. In most cases, it's smarter to use a smaller image size rather than Boost mode to get a suitably bright picture for the ambient light level.

The 4K1 weighs 3.8 pounds not counting its external AC adapter, and it measures 2.4 by 8.3 by 7.2 inches (HWD). Setup is mostly standard for the category, which means there's no optical zoom. One nice touch is the powered focus, which I found easy to control for an edge-to-edge sharp image.

Inputs include two HDMI 2.0 ports, a USB Type-A port for reading files from an external storage drive, and a slot to read files from TF and microSD cards. Note that although both HDMI ports support HDCP 2.2, the copy protection scheme used on 4K UHD discs, the 4K1 does not support HDR. In other words, while you can watch 4K UHD HDR movies on disc, you won't get the improved dynamic range promised by the HDR format.

The onboard audio is a bit underpowered. The dual 2-watt speakers deliver acceptable quality for a portable projector, but barely enough volume for a small family room. For most scenarios, you'll want to use the 3.5mm stereo audio-out port to connect an external sound system.

Good Contrast, Good Enough Color

The 4K1's settings options are typical for those of a low-end projector. The menus offer three predefined picture modes that you can't modify, plus one User mode that lets you change only contrast, brightness, color saturation, and sharpness. The menus also list a Tint option, but it's not available, leaving no way to adjust hues.

All of the picture modes had a slight green bias that showed most obviously in skin tones. This increased noticeably when using Boost power mode, making the latter best ignored except when you absolutely need peak brightness. This is presumably why AAXA chose Standard power mode as the factory default.

Of the three predefined color modes, the Standard picture mode (not to be confused with Standard power mode) delivered the best color accuracy and saturation. However, User mode delivered identical colors, with the added ability to adjust brightness and contrast. For my viewing tests, I took advantage of both settings to provide somewhat better contrast and shadow detail.

One quibble in the course of that: The obvious way to bring up the control menus hides the image, making it hard to know what the results will look like. As with the M7 projector mentioned earlier, however, there's a hidden approach that adds the Picture menu as an overlay. To see the image and menu together, you must hit a button on the remote that's labeled with an icon resembling a camera iris, then navigate through the menus to choose Picture, and then Picture mode.

I found movies and video quite watchable. The 4K1 managed to show almost all of the shadow detail in the darkest scenes in our test suite, retaining the dramatic impact nicely in a dark room and showing enough detail to see what was happening even in low to moderate ambient light.

The portable also scores well at avoiding the rainbow artifacts that are always a potential issue for single-chip projectors. Some people rarely or never see these flashes of red, green, and blue, but I see them easily. Happily, I saw them only rarely with the 4K1. As with any single-chip projector, if you find these artifacts bothersome, plan to buy from a dealer who allows returns with no restocking fee so you can audition the image for yourself. Also note that the AAXA 4K1 has no 3D support, and its input lag makes it suitable for casual gamers only—I measured the lag with a Bodnar meter at 46ms for 1080p and 51ms for 4K resolution (both at 60Hz).

As I noted earlier, the combination of the Standard power and picture modes delivered an image roughly comparable to 600 ANSI lumens. In a dark room, the 16:9 image was easily bright enough to fill my 90-inch diagonal, 1.0-gain screen. (See how to choose the best-fit screen for your projector.)

Not Bad for Carry-On Cinema

The AAXA 4K1 Ultra HD doesn't deliver the kind of color accuracy a video enthusiast would want in a home theater, but for more casual viewers—and even for demanding viewers in casual scenarios such as a backyard movie night—it offers accuracy that's good enough to be watchable, plus surprisingly good contrast and shadow detail for an entry-level projector. If its $999 price is beyond your budget, consider a 1080p model like the AAXA M7 or the $599.99 Anker Nebula Solar Portable, which is our current Editors' Choice winner among 1080p portable projectors.

If 4K resolution matters more than portability, also think about the $1,699 Xgimi Horizon Pro and the $2,499 Xgimi Aura 4K, the latter our Editors' Choice pick for what amounts to an entry-level 4K ultra short throw projector. But if both Xgimi models are out of your price range, or you want a projector that's both 4K-capable and portable, the AAXA 4K1 is a solid value that's easy to recommend.