I have trouble visualizing exactly how much noise reduction I would get with the -18 db rating.  I have read that the decibel scale is logarithmic ... which makes it even harder for me to visualize how one decibel rating compares to another.  But I am concerned that -18 might not be enough...

  Thank you for the links!  I think I'm on board with the idea of raising my price range if I need to, but I'm a little concerned about the "Noise Isolation: -18dB" range for these...it looks like less noise isolation compared to others I was looking at. Is that because the "ADEL" module lets...

I want to buy custom molded IEMs and I am not an audiophile so I feel overwhelmed with all the choices. Can you help me narrow it down? I only know that my budget is $500 or less and I want something that's custom-molded to my inner and outer ear shape. I have Shure se215 and I wear them with...