- Written by Chris Heinonen
- Published on 24 September 2012
The JVC X70 Projector On The Bench
With THX Certification and the screen selection options available for the X70, I expected to see something really good out of the box, but the results were only OK. Projectors are very fickle beasts, with room conditions, lamp age, and screens causing impacts on the image being displayed, so out of the box in a certain room this might be calibrated perfectly, but it wasn't in my room. The average grayscale dE was 7.5 and the color dE was 3.2. There was a bit of a blue tint to the image, and gamma was closer to 2.0 than the 2.3 that I selected in the menu system.
Of course the X70 has a full selection of ISF controls available to dial in the image, and I took advantage of those to dial in the image far better than it was before.
Now our grayscale dE has dropped down to being pretty close to perfect. That average dE is actually closer to 1.5 than 2.6 if you throw out the result at 10%, where the color shift isn't as readily visible as with brighter colors. It's also a measurement more subject to instrument error and less likely to be as accurate as a result. The two point grayscale let me get it very close to perfect, though I'd like to see high end projectors like this start to include a 10 points or 20 point grayscale in the future, so those obsessive like myself could get it perfect.
With the exception of Blue, we see all colors improved a lot from the CMS, with Cyan getting the largest improvement overall. Our average error went from 3.2 down to 1.1, or an amount that is imperceptible in real world use and likely even in side-by-side evaluation. Looking at the chromacity chart shows that the Hue error in Cyan has been corrected, and almost all errors are within 3% or less, other than those blue results. Of course Blue is the color where errors are least perceptible, so this is a result we are very happy with.
Finally with the Gamma chart we see that our gamma is now spot-on to the 2.3 value I was targeting post-calibration.
Evaluating bench test results was a bit more difficult with the X70. The e-Shift can introduce issues with how test patterns are rendered, so it's hard to determine if it is handling the test incorrectly, of if that is how e-Shift works. Disabling e-Shift for a minute to look revealed that the JVC passed every test with flying colors.
The X70 once again was amazing with its on-off contrast ratio. With the lamp at high and the iris totally open, I had a contrast ratio of 10,387:1, and when the iris was closed the numbers hovered right around 25,000:1. When I took my lumens measurements, I already had around 400 hours on the bulb of this review unit, and as they are off a screen they are only estimates. I found that fully calibrated I had 435 lumens in high lamp mode, and 261 lumens in low lamp mode. This provided an image that was perfectly bright on a 96" 1.3 gain screen, though when using the zoom method to fill a 122" 2.40 screen I had to go up to high lamp mode and then close the iris a little bit.
Average 3D crosstalk only measured in at 0.2% using the AccuPel DVG-5000 test patterns, though it was noticeable in actual content.
Overall the JVC X70 calibrates wonderfully, handles all colorspaces well, and will leave you with an image that will just blow you away.