Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
As far as EQ settings, I just set the preset to 'rock', f'ing around with the bass treble is a waste of time, I don't know why they didn't put a full EQ option in it, it would have been so easy for them to do during design, but we all know the entire audio / iQ system is lacking in many ways that could have been easily implemented during its design.
I'm really struggling to get the pins out of the connector, perhaps the connector got changed in the S2's?