AVS Special Member
Join Date: Jun 2005
Location: Northern, VA - Washington, DC
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For home theater use it rarely makes sense and is often a bad decision.
The problem with stacked projectors is that they really need constant maintenance. CONSTANT!
So, if you are a DiY type of person, and need the lumens (why?) then you can certainly set it up yourself, and then go through the constant maintenance that's required for this type of setup. The person in the video is technically competent and sets these up for specific functions temporarily, not full time.
Issues not addressed:
1. Color uniformity. A huge issue from projector to projector is that lamps aren't matched, so they both look slightly different from each other. It's impossible to get 'perfect' color from two projectors with non-matched lamps, and perhaps non-matched colors internally, but it's the lamps which are the real guessing point.
2. You raise the black level ground floor. Expect to take a hit on black levels.
3. The use of corner keystone correction is not in every projector, and will lower overall sharpness and lumen count by a bit.
4. Projectors tend to exhibit a bit of color drift from week to week. In a single projector setup, it's not an issue, but with two projectors, alignment will need to be done weekly for best results.
I like the idea, and it's certainly nothing new, but commercial companies typically avoid installing this because of the time involved in required regular maintenance. There's a cost factor which doesn't typically pay out if the projectors are used day in and day out.
AV Integrated - Theater, whole house audio, and technology installation in the Washington DC metro area.