All my stuff is starting to show up. Bought some local to. The PPI amp has an adjustable crossover but the crossover adjustment isn't marked and the detents(clicks) are undetectable. Is there a radio shack meter or other that can determine the frequency level that is being set by the crossover. Also what would a good low pass level be? I know subjective but just a rough idea. I've heard 85 and 100. Thanks all!