Bose L-1 or L-1 Compact.

For most venues you will only need one of them.

As to your other question, the Earphone jack output of the laptop can indeed be safely used as Line Out to PA if you get the right kind of stereo adaptor for that job. Make sure that you go into the soundcard's software mixer and turn the output for BiaB and the master fader ALL THE WAY UP for best fidelity. This is because an Audio Line works best when DRIVEN like that. Adjust your Volume at the PA controls.

I don't use nor need an EQ on the live gigs with BiaB. It sounds good as it is, provided you don't start adjusting things for each song and the like.

--Mac