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I've seen a few posts about "struggles" with quads. Though I am still tweaking here are a few things I've learned after MUCH testing. If you have made any effort to assign the different inks to their appropriate portions of the tonal scale you must make sure you are not printing through a profile, or any space other than RGB color (driver) or CMYK color (rip). The software thinks you are in color, the profiles "correct" that color and by doing so puts ink you don't want in tonal areas you don't want it. Took me forever to find this seemingly obvious flaw in my procedure. On Concorde ink levels must not get too high. I've had best results by limiting individual channel output levels to well under 100% with all but the 100% black ink. Dan Culbertson says he has not found this necessary but our methods may differ in other ways and this has been the only way I have gotten good results on Concorde. Lysonic paper doesn't have problems with lots of ink, Sommerset I haven't been able to get anything on, unless you like the look of ink splattered on Charmin. The only other papers I've tried are Liege, a bit irrelevant for quads, and a beta paper , both of which also needed levels limited a bit. If printing with StylusRIP you must watch the total ink as well, go over 200% much and the RIP will take over and substitute black in those areas. Dan has mentioned this many times but I had to learn the hard way. As his methods suggest, the channel mixer is invaluable for controlling total ink. Yeah I know, when PressReady comes out we will all experience Nirvana. With Dan's RGB method printing with the driver (it work's!) I'm not sure what total ink limit needs to be. But the driver is substituting K for dark RGB values at some point, so it's still an issue. There are ways around all these problems, and I've seen some pretty bad quad advice. I'd bet I'm not the only one trying to optimize this process and would be very interested in other's trials and methods. Tyler - Please do not include an entire message in your response. Delete the excess. http://www.leben.com/lists for list instructions.