Is the dvx letterbox 1.66:1 or 1.76.1?
Which of those two sizes is the average widescreen tv?

I'm not familiar with the exact implementation ont the DVX, but 16/9 = 1.78

Do the math.... typical pixel dimensions of different flavors of widescreen TV's

1920x1080 = 1.78:1
1367x768 = 1.78:1
1280x720 = 1.78:1
854x480 - 1.78:1

But unfortunately every consumer widescreen TV that I've seen overscans, so the entire image isn't seen; you lose a little around the edges of the image. Also, 4:3 video pixels are not square so in terms of the camera's sensor, cropping to 720x360 will give you a 16:9 letterboxed image.

Thanks a lot, my bad for not knowing

It is approximately 1.72:1, based on the idea that each letterbox bar is 58 pixels tall. It's supposed to be 16:9, but it seems like the image is just a pixel or two taller than 16:9.

Thanks so much barry! I just wanted to know so I could mask my lcd screen appropriately.

DVInfo.net sponsor EVS sells some pre-made LCD masks, I think they're called ScreenSkins or something like that...

They are , indeed, called Screen Skins. They're available in 16x9, 1:85 and 2:35 masks. EVS sells them (ask for Rush).
You could make your own, but at less than $5 for a pack of 2 that can be re-used many,many times, why bother? Whatever you do, don't use tape on your LCD scren... the adhesives vary widely and can leave some nasty residue.
Hope this helps.
Ken
the Screen Skins guy

Thanks I'll order some soon!

Quick link:

http://www.evsonline.com/merchant2/merchant.mvc?Screen=PROD&Product_Code=SSDVX