 The ported version adds an octave of bass extension dropping the -3 dB point from 100 Hz to 50 Hz but the tradeoff is the cabinet size is more than twice as large, 8 litres of interior space vs. 3.8 litres.It is also worth noting that above 200 Hz the simulations converge and there is no difference.Thus a ported cabinet does not provide improved bass output over the entire sub-bass range.