On Mon, 18 Aug 2008 18:21:27 -0700, Lyle Johnson wrote: >The 8-pole filters have no offset, please use 0.0. I beg to differ. Based on rather careful measurements, my 400 Hz 8-pole filter needs an offset of .045 to center it with the DSP filters. I don't recall whether I settled on .04 or .05. 73, Jim K9YC