My experience with the Peavey PR15s was that the mids did NOT need to cut in the main e.q. mix. Most people seem to automatically set their e.q. sliders in the "classic" V position, in effect boosting the highs and low and cutting the mids. The mids are where instrument sounds such as piano and much brass reside.
DNJ, you are playing many jobs with a $100 set of speakers and a $100. mixer and a $1500. keyboard. 20 years ago, you were spending 5 or 6 times that much for your gear. Inexpensive doesn't always mean poor quality. The manufacturers such as Shure, JBL, Fender, etc., have been charging extremely high prices for gear for many years. Now companies such as Behringer, Samson, and yes Peavey, are offering comparable or better gear at lower prices. The little $99. Alesis mixer is a wonderful example. You say buy cheap sound cheap, but you are buying cheap and sounding wonderful!
DonM