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I own a JVC and a DLP (side by side), and have for years.
I have had both projectors in 5 different rooms over the years (I move a lot).
If the entire room is bright white, yes that does put a big hit on the contrast, but the JVC will still have the darker blacks.
The room color by itself is not enough to kill off ALL the difference (not between a DLP and a JVC), maybe between a JVC and Epson (since they are closer).
So would it still be worth it for Sci Fi or dark movies to own a JVC over a DLP in an all white room?
I would say Yes, but it partly depends on just how bad the room is and how close the side walls are.
A very large room with all white walls is totally different than a small room with white walls.
The black levels of most DLP's are just so bright that they keep the entire room more lit up. The reason the JVC still appears darker with white walls is because
the entire room gets darker from it emitting less light in dark scenes overall. How much 'better' the JVC looks in a bad room just depends on a lot of factors.
Now, if you add even just a tiny bit of ambient light, then the room will marginalize the difference much more.
The biggest killer of contrast (aside from ambient light) are the immediate side walls.
If the side walls are too close to the screen, that causes a big hit both perceptually and reflecting on the screen.
Next, is the carpet, then the ceiling, and the backwall is last.
If you can get the sidewalls and the carpet dark, then go from there.
Last edited by coderguy; 08-15-2018 at 04:26 AM.