PBASS is an option in the stock headunit menu that gives a little more bass boost (for me, it sounds like even lower frequencies). It should be found on the 2010-2013 models; not sure about where it's found on the 2014+ models.
I don't think there is a perfect setting that will apply to everyone. My perfect setting is based on my hearing and how well I can hear within my car. With the former, hearing can be affected by noise damage and the normal progression of age. With the latter, a quieter cabin might require less setting changes than one where there is a lot of external noise.