The Chebyshev filter features a steep roll-off, but has ripple in the pass band, so it is not suited for audio signal use, where a flat response is ideal. The roll off is so fast that the common definition for cut-off frequency does not work for Chebyshev filters. For this type of filter the cutoff is defined as the frequency at which the response falls below the ripple band. This filter is good for removing harmonics and intermodulation in RF applications.
For more detail: 1kHz Chebyshev Filter
