1. An audio enhancement system, comprising: a first adaptive filter that filters an input signal based, at least in part, upon a plurality of adaptive coefficients, the first adaptive filter providing a quality enhanced output; a second adaptive filter that filters the input signal based, at least in part, upon the plurality of adaptive coefficients, the second adaptive filter modifying at least one of the plurality of adaptive coefficients based, at least in part, upon a feedback output, the second adaptive filter further providing an output; and, a feedback component that provides the feedback output based, at least in part, upon a non-linear function of the output of the second adaptive filter, the non-linear function being based on maximizing kurtosis of a linear predictive coding (LPC) residual of the quality enhanced output.