Received my Darblet yesterday, and here is my chain:
Comcast HD receiver + Panny BDT210 BD player -> Denon 1911 -> Darbee -> Acer BD9500 (PJ)
Blu-Ray works great and I can notice a difference pretty easily, and this is on a sharp DLP projector. I am happy on HD with a setting of 45%. I don't notice any processing at that setting and you can still see that the image is enhanced. Over 50-55% or so and I start to notice, what appears to be, processing from 12.5 ft away on a 125" screen.
Comcast is a no go through the Denon. I either get just sound and a blank screen, or flashing magneta and a solid green screen, or a black screen with no sound. Have tried multiple HDMI cables (4-6ft), and different HDMI ports on the receiver. If I hook the Comcast receiver up directly to the Darbee and then to the projector it works great

So it has to be something with the Denon and Darbee that Comcast just does not like. I have three things left to try:
- Try moving the Darbee closer to the projector
- Buy a longer higher quality HDMI cable (Blue Jeans, I am using a cheap no name and cheap Monoprice HDMI cable now)
- Use component cables with my Comcast box and an optical cable.
I am not opposed to going with component, I have tested before and there is zero noticeable improvement for me between HDMI and component.
Hopefully I can get this working with HDMI, but it is rather frustrating, especially since I just switched to Comcast from DirecTV. I just got tired of climbing on a latter on a 3 story house in a snow storm and trying to get snow off the dish to watch TV, and switching to Comcast saved me like $100 a month...
Ughh....