Hi Marion, I would love to get the number of the ISF Tech you used. My buddy is at his witts end with this thing. He bought it two years ago or so and paid handsomely for it--so he'll be interested in a solution for certain. I also agree in going with a non-perf screen. With a perf-screen you loose on both ends--you don't get 100% out of the sound or 100% from the screen. The trick here is finding a center channel with excellent off-axis response. There sure seems to be a lot of talk here about the SV subs...I'll have to call one in to hear what all the fuss is about! As far as the "Rainbow" affect is concerned, none of the higher-end models that I'm aware of suffer from this anomolie. Likewise, it can be caused for a number of reasons not related to the projector itself. I believe the only way to stay with the times is to go with a 3-chip DLP--but I may have to sell my Rover to afford one!