MacDSP is a digital filter for Macintosh computers with a PowerPC processor. It is currently under development.

Connect your audio source to the MACs microphone jack, select the low and high pass frequencies, and MacDSP will do the rest.

The latest version of MacDSP breaks the audio spectrum up into ten bands, the amplitude of each band can be controlled. The bands are spaced on a geometric basis (that is, they are not linearly spaced). Each band is made up of a second order Bessel filter, designed to pass only the audio frequencies within that band. It works much like an equalizer does in your stereo.