I wouldn't use a passive distribution amp. Especially given the length of cable run involved I would use an active da, such as
http://www.kramerelectronics.com/products/model.asp?pid=687#t. Still, I can't find any reference to how far it will drive the signal before any significant degradation. BTW, you definitely need to be 100% certain of which projectors will be used before you show up for the job so that you are sure to bring the right equipment. From your description of the setup it wasn't obvious to me that you were sure about the projectors. You might want to see if the client will allow you to spec the projectors being used so that you control all aspects of the tech side of things.
Joel Servetz
RGB Media Services, LLC
Sarasota, Fl
videobyjoel@aol.com
http://www.rgbmediaservices.com
