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Alternate application: passive polarized 3D. The 3D-XL doesn't just do active-shutter 3D. A small switch on the back of the box can change the 3D-XL's output from 720p 3D to 1080p 2D, selecting one channel of the 3D image and sending it along while ignoring the other. You might see where this is going. With two 3D-XLs, two projectors, two polarizing filters, a silver screen, and some cheap passive glasses, it's possible to set up a passive polarized 3D system at home. This has its advantages, among them the ability to use higher-end projectors built for home theater and the ability to accommodate very large audience sizes since passive glasses are dirt-cheap (less than $5 per pair in some places). It has its downsides, too: a silver screen is mandatory, projector alignment can be tricky, and (obviously) you need to own two projectors and two 3D-XLs to make it work, which can get expensive. The passive polarized route isn't for everyone, but the 3D-XL is a great device for those who choose that method.