i building a replica of my first bx but i want it tuned different. Should i give each sub its own chamber? the box is 29.5x29.5x16 high external port is 3 inch wide 14.5 high and i want it tuned to 45 hz for competition so how deep should it be. If i make it 2 chambers there gonna each have there own port if not should i make 1 port or 2 ports? thnx