Okay... I built and installed the DSP unit in my K2. The four AF filters are all better than the KAF board. The Noise Reduction suffers from the same weakness as all the other DSP units I've tried. There's a watery sound to voices and the wider the bandwidth the worse it gets. CW sounds much better. Is this an issue with all DSP NR or did I miss a setting somewhere. 73, Lonnie NY2LJ