1. A method for active noise equalization comprising: obtaining a sync signal synchronized to an engine speed from a noise source reproduced into an acoustic space; generating a noise model, representing one or more complex tones, responsive to the sync signal; receiving an audio signal representing a sound field in the acoustic space; applying an estimate of a secondary path transfer function to the noise model in a frequency domain; and applying a transformation function to the noise model where the transform function is responsive to reducing a sum of the output of the transformation function and the received audio signal; where applying the estimate of the secondary path transfer function comprises an online calculation; and where an output of the secondary path transfer function is limited to a range of frequencies that lies within an aural range.