Thank you for your response and it makes total sense. I guess I was guilty of just thinking "higher up" on the frequency was "more bass" but as you said that's not the case.

I do really like the feel, shape and cable of the S12 Pro's so I will take your advice and just give them a better shake for a few days. I do like the way they sound but I guess I am so use to the thump that I was taken back a bit.

Thank you again for helping me understand this better.