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Join Date: Mar 2003
Location: Lower California
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I probably should have posted on the DIY section, but the xD commentary seems more active over here these days.
Again, the rationale is to "convert" a smallish AT screen from single-chip DLP to light cannon.
IMHO the trick is to get the spraying applied evenly. Don't want to reduce the reflectivity too much, so a lighter shade of gray would be sufficient. A thinner coat should have less effect on the acoustical properties, and will have less visible hot spots.
Which brings up another question: Isn't the xD material reversible? If so, you might be able to have two screens in one, or at least get a second crack at the spray application (spray bleeding notwithstanding).
Although it might further the science aspect, I don't think test gear would be necessary for an acoustical evaluation -- just A/B between a small treated sample and an uncovered speaker. I'm reading about -2dB VHF reduction currently with xD; I would expect another 1-2dB or so (maybe lower HF corner freq), which would be no big deal to equalize with a simple Baxendall-type pre-emphasis. Just get the FM radio unmuted interstation (white) noise to sound the same, and you're there.