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Review Contents
Performance
4
Features
Ease of Use
Value
Intended Use:
DIY Home Theater
miroir M631 Projector miroir M631
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1000:1 Contrast Ratio
700 Lumens
$650 Street Price
$649 MSRP

Miroir M631 Ultra Pro LED Projector

M. David Stone, June 27, 2019

MIROIR M631 PROs
+ 1080p native resolution with support for 4K input at up to 30 Hz

+ Supremely easy to use; there are no menus, and the only controls are for focus, volume, source, power level, and inverting the image for a ceiling mount

+ Highly portable, at 2 pounds; includes two HDMI ports and one USB-C

MIROIR M631 CONs
- Just a single color preset and no menus available for color, contrast, or any other adjustments

- Lacks HDCP 2.2 copyright management for 4K signals

OUR TAKE ON THE MIROIR M631
The Miroir M631 delivers handsomely on its promise to deliver a decent-quality, 1080p image in a highly portable package, but its defining strength is that it's supremely easy to use.




Miroir-M631-Front-Top

Miroir's website touts the $649.95 Miroir M631 Ultra Pro projector as being designed for iPhone, iPad, MacBook, and Apple TV. That explains why Apple sells it on its website as an iPhone accessory, but it doesn't mean you should ignore it just because you're solidly in the Android or Windows camp. No matter the driving force behind the design, the M631 is a highly portable, native-1080p projector with two HDMI ports and a USB C port, which means you can connect it to just about anything—as well as use it for anything from watching movies, to showing off photos, to giving presentations.

As is typical for projectors in its 2-pound weight class, the M631 is built around a DLP chip and LED light source. It also falls solidly in the lifestyle projector category, which means it's all about ease of use and is aimed at consumers and road warriors who care more about convenience than the usual enthusiast concerns like precise color accuracy, contrast, and black levels. In that context, it succeeds notably well.

Miroir M631 Features/Advantages

  • Rated as the LED equivalent to 700 ANSI lumens for lamp-based projectors, which matches our subjective observation

  • Measured at 298 ANSI lumens in its brightest mode

  • LED light source rated at 20,000 hours

  • 1080p native resolution using DLP chip with square, rather than diamond-shaped, pixels

  • Two HDMI 1.4 ports

  • Accepts a 4K UHD (3840 x 2160) signal, downsampling it to the projector's native 1080p (4K UHD support limited by copyright management and to both 30 Hz maximum and 8-bit color)

  • Powered manual focus

  • Attractive piano-black case

  • Both remote and case have buttons for all controls: focus, power level, volume, source, and inverting the image for a ceiling mount

  • Built-in lithium-ion rechargeable battery rated at two-hour life when fully charged

  • USB-C port for video input and both power in and out: when operating on AC, it can charge a cell phone while doing a presentation; you can also use it with a MacBook Pro charger to charge the projector's battery

  • Two on-board 3-watt speakers; 3.5mm analog audio-out jack

  • 1.98 pounds, 1.5 x 9.5 x 5.4 inches (HWD)

  • 1-year warranty

Miroir-M631-RightFront-Remote

Miroir M631 Limitations

  • The M631 showed an exceedingly slight green shift, although not enough to notice without a reference image to compare to

  • Can't turn off auto keystone

  • No 3D support

  • No zoom

  • UHD support is limited to input with a maximum 30 Hz and maximum 8-bit color, and it lacks the HDCP 2.2 copyright management required for UHD Blu-ray and major U.S. streaming services

  • Fan noise is high enough in both volume and pitch that it may be a problem for those who are particularly sensitive to noise

Placement. The M631 is designed for either a tabletop or a ceiling mount. When sitting on a table, the bottom of the image is at the same height as centerline of the lens. There is a screw receptacle on the bottom for a tripod mount.

Screen size. Based strictly on our brightness measurements, the M631's brightest mode would be suitable for a 90-inch diagonal, 16:9, 1.0 gain screen in a dark room or a 55-inch screen in a family room at night with the lights on. As with many LED projectors, however, its perceived brightness is higher than you would expect from the measurement. I found it easily bright enough for an 80-inch 1.0-gain screen in a family room at night with lights on and usable, if a little dim, at the 80-inch size in the same room on a heavily overcast day with light streaming through the windows. It was also quite watchable in a dark room at 120-inch size, although contrast and color saturation were both enough better at 100 inches that I preferred staying with the smaller size.

Miroir-M631-Front-Flare

Resolution and 4K UHD Support. The M631's support for 4K UHD (3840 x 2160) works with sources like PCs, but its lack of compliance with the current HDCP 2.2 copyright management protocol used by almost all 4K content means that 4K source components will most likely send 1080p to the projector.

Based on my tests with a Murideo Six-G signal generator, and as confirmed by a Miroir representative, the M631 will accept 2160p video at 30 Hz or 24 Hz and 8-bit color depth with or without HDCP version 1.4 active and with or without an HDR10 flag added. With any of these variations, it will display the image at its native 1080p resolution after internal downscaling. However, it will not accept UHD signals at 60 Hz or with 10-bit color depth or with HDCP 2.2, which is used to protect all UHD Blu-ray content as well as streamed UHD from the major internet services. That leaves little to no way to take advantage of HDR in today's UHD content, which is why Miroir doesn't tout HDR as a feature.

As a practical matter, if you connect the M631 to a source that's capable of sending a 4K signal the projector can't handle, it will usually automatically negotiate the connection, instructing the source to send it a 1080p signal instead—downscaling before sending if necessary—so the image will play without problems at the projector's native 1080p.

For example, faced with a UHD Blu-ray player set to 2160p, the projector reported No Signal even without a disc playing. But with the player resolution set to Auto, the projector reported receiving a 1080p signal. As expected, everything worked without problems when I played a 1080p Blu-ray disc with the older copyright protection. Switching to a UHD Blu-ray disc resulted in the player showing a message that the projector didn't support 4K UHD. However, it still let me play the UHD disc, with the player downsampling to 1080p, and also using the older copyright protection and ignoring the HDR encoding.

Image Quality. The M631's lack of menus translates to it offering only one color mode, and no way to tweak it. That makes it the only mode for both presentations and video.

The test unit had an ever-so-slight green bias, but it showed only in subtle ways. Yellows in business graphics showed a slightly different hue compared with the yellow on my laptop LCD, reds in both graphics and photorealistic images were shifted to being just a touch orange-red, and a test photo I use because its skin tones turn green with even slight green shifts showed just a hint of green in comparison to what I know the image should look like. Even after a couple of evenings of using the projector to watch TV and movies, however, the test photo was the only instance I saw where memory colors were outside of a realistic range. Most people should be happy with this level of color accuracy. Changing brightness from Normal to Eco has no effect on color.

For presentations, colors were vibrant and eye-catching. For film and video, colors were nicely saturated, and contrast and three-dimensionality were good for a projector in this price range. In a dark room, the black level looked suitably dark, the projector lost little to no shadow detail, and contrast was good enough to add a sense of three dimensionality. Much the same is true in a room with low ambient light, at an appropriately smaller screen size.

The focus was typically a little soft, primarily because the lack of fine control for the powered manual focus adjustment makes it difficult to stop at precisely the right place. Even so, I didn't find it hard to get close to sharp focus across the entire image. The trick was to keep alternating between focusing in one direction and then the other, until the lens stops close enough to well focused as you need it, or, if you're lucky, actually stops at the point of ideal focus.

Rainbow artifacts. I didn't see any rainbow artifacts with the M631, even in a black-and-white graphic designed to bring them out or in my go-to contrasty black-and-white movie test clip that tends to make them show. And since I see them fairly easily, there are likely few people, if any, who will consider them a problem. That said, any projector that uses sequential colors and a DLP chip can theoretically show these artifacts. So if you see them easily, or don't know if you do, it's still best to buy from a source that allows easy returns, so you can test it out for yourself.

Audio. The onboard 3-watt stereo speakers delivered good audio quality for a small projector and enough volume to fill a small room.

Conclusion

For anyone who wants an easy-to-use projector as a companion to their phone, tablet, or laptop, for portable home theater or for presentations or educational use, the Miroir M631 Ultra Pro is hard to beat. It's also a solid choice for applications like a small conference room or small classroom projector, and can serve for budget home theater or casual gaming. Serious enthusiasts and gamers can easily find lamp-based projectors in this price range with shorter lag times, brighter images, better contrast and color accuracy, and the ability to tweak image quality. But if you care more about ease of use, portability, and maintenance-free operation—with a light source that will last the life of the projector—the Miroir M631 is a top contender.

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Connections, Measurements
Review Contents: Review Connections, Measurements

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