It's been posted many times... There is a great deal of discussion in the forums, but what it boils down to is which filter works best for you, at your specific location, depending on what you are monitoring, and what kind of local RF noise and/or interference at your location. In other words, experimentation along with trial and error is the approach. Someone else's settings may not work at all for your needs, and could even make your reception worse.
Thanks So Much
What I ending up doing was to turn it off. Should have done a search first. Before posting anyway I like talking to you all lots of knowledge on this form!