I was wondering what frequecy ranges are not dependent on direction? I know a subwoofer can be placed anywhere in the room as it is not directional. But until what frequency does it go up to in order to have to be faced towards a person to hear? I want to make some mid-ranges to handle somewhere between 200-400Hz and not have to place it somewhere to see. If possible I want to place it along with my sub, no where to be seen.