The 4 Series processing platform has been designed to operate at a native sampling rate of 96 kHz, and also be powerful enough to cope with the additional inputs and outputs. Available on each input channel is a 28 band graphic equalizer, in addition to 8 bands of fully parametric equalization. Each output path features up to 9 parametric sections, in addition to the crossover filters which themselves now offer slopes from 6dB/Octave up to 48dB/Octave. All parametric sections can be reconfigured to many alternate filter behaviours, including the familiar high and low shelves and notch filters, but along with band pass, elliptic and variable 'Q' shapes, and phase adjustment, in 2 degree steps. Each output also features a combination of limiters - a limiter which is designed to protect individual drivers from over-excursion/overdriving, and an additional look-ahead "D-Max" limiter for added safety.