Well, Klipsch says the 450 and 250 both get down to 58 Hz. So there seems to be no reason not to use the standard crossover frequency of 80-90Hz. The only thing I can find in the manual that mentions150 Hz specifically references the 140SA Atmos elevation speaker. Am I missing something?
Well I don't know, the booklets that came with the 450 and 250's all said the same thing. Xover should be a minimum of 150hz, that's why I am asking the question. Based on what you read about them going down to 58hz I would agree with you, and will make the changes. Thanks for your help.