The P2 specs sound very useful. Being able to drive 4 universes of pixels from one output (with the necessary power injection along the way) can really reduce the number of controllers for a matrix of pixels. But - since don't have a P2 and am just now buying pixels for a matrix, I'm wondering if anyone knows from experience if you would be able to see the physical time delay from the First pixel to the Last pixel if you really added 4 universes (4x170 pixels)? How long does it actually take to pass the data thru 680 pixels? One of the Horizontal Matrix plans I've sketched would actually need both P2 outputs to drive the Top Half and the Bottom Half of the matrix. At the middle of the matrix, where the second output connects, would the average viewer see it Start slightly ahead of the row above it (from the first output)? I'm sure that driving the pixels at the fastest possible refresh clock would help, but am curious.