Loudspeaker Modelling

Hi, I have a simple cabinet with a port on the front face. I then have half a sphere normal to the front face acting as the air domain.

Firstly, how can I look at the modes inside the cabinet? Using the pressure acoustics module I have tried to link the air domain to the hollow space in the cabinet but it treats the whole model as air and the hard boundaries of the cabinet seem to be non existent.

Secondly, I want to look at the on-axis response. Is it possible to essentially place a microphone at a point in space in Comsol? I was thinking of modelling the woofer and tweeter as monopoles to begin with. Or is there a better way to approach this?

Thanks