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Review Contents
Ease of Use
Intended Use:
Mobile Presentation
Optoma ML550 Projector Optoma ML550
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10000:1 Contrast Ratio
500 Lumens
PC 3D Ready
$479 Street Price
$799 MSRP

Optoma ML550
Portable LED Projector

Marc Davidson, December 16, 2013


The only limitations worth mention that I ran into with the ML550 are typical for this category of projector.

Low audio volume. The 1-watt speaker is loud enough for a group of two or three people close to the projector, but low quality. If you need sound, you'll be better off with an external audio system or headset.

No zoom. As already mentioned, the ML550 lacks a zoom lens.

3D is highly limited. The 3D support is strictly for use with computers. As a practical matter, it's actually even more limited than that suggests, since 3D effectively cuts brightness by more than half.


Compared with other portable LED projectors, the Optoma ML550 offers the advantage of being smaller and lighter than most models with similar brightness, and brighter than most models with a similar size and weight. It can also free you from carrying or even needing to connect to bulky image sources like laptops. Instead, you can use a USB Key, microSD card, the projector's own internal memory, or a cell phone or tablet. Add in the good data image quality, watchable video, and sub-$500 price, and the ML550 is well worth a look.

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Key Features and Testing
Review Contents: Introduction The Viewing Experience Setup Key Features and Testing
  Limitations and Conclusion

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Comments (7) Post a Comment
Tony Posted Dec 17, 2013 10:54 AM PST
Why would you buy the ML550 when for $100 more you could buy the ML750?
frank Posted Dec 28, 2013 3:21 AM PST
price quotation and conditions of transportation
Jeff Posted Dec 30, 2013 5:33 AM PST
If the ML550 is the projector you are saying I am getting for $100 more than projector X to get 500 Lumen (and any of the other features) over the 300 or 400 lumen projector you were originally looking at.

You can keep saying well, this one is only $X more....
Nabi Posted Jan 10, 2014 5:30 PM PST
You've got to watch the claims of long LED lamp life. It's more than a bit of a scam: over time the lamp gets dimmer and dimmer. On my Acer unit a note popped up on the screen at around 2000 hours advising that it would no longer produce the light necessary for bright mode and suggesting lamp replacement. It was impossible to get hold of Acer to make my complaint. The performance of that projector is now increasingly wishy-washy so I'd suggest you view LED projectors as primarily good for portability particularly as more conventional projectors have lamps that last over 4000 hours now.
JD55555 Posted Feb 24, 2015 2:45 AM PST
Have a problem with my Optoma ML550. The projector work great when directly connected to different sources with HDMI - roku, HTPC, PS2, chromecast. However, when an HDMI switch is used, no video is displayed by the projector. A TV connected with the same cables, works perfectly. I've tried 3 different HDMI switches, including a powered J-Tech "matrix" one. I've swapped all the HDMI cables and tested with the projector AND the TV. TV works, projector doesn't.

It is not an HDCP issue - I've seen the "non-compliant hardware" warning from the roku connected to a computer monitor. That isn't it.

Swapping the HDMI cable to use another device is getting old.

Does anyone have an HDMI switch that actually works with the Optoma ML550 projector?
xxx Posted Nov 15, 2016 4:46 PM PST
Does anyone know if this projector reads subtitles files ( .srt)?? Thanks in advance
Ron Posted Nov 19, 2016 9:56 AM PST
These are cross-branded... ACER seems to be the originator - it's identical to the K series... in this case a K135. Acer spec's theirs at 600 lumens, but other than that, it's the same beat... different skin. Look at all of the physical aspects... connectors, card slot, IR sensor, cooling openings, lens, etc. I have the K132 which is why I recognized it.

It would be interesting to know who actually makes these... when I mod'd my Acer (to get direct audio output), I saw no names internally.

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