Resolution of ripple spectra depending on spectral bandwidth was investigated in normal listeners using the phase reversal test in conjunction with recording slow auditory evoked potentials. The test signal had a band limited rippled spectrum. The central frequency of the spectrum was 2 kHz, and equivalent rectangular bandwidth was from 0.5 to 5 oct. The signal level was 80 dB SPL. The principle of the test was to find the maximum ripple density (rip/oct) at which the slow auditory evoked potentials (N1-P2 complex) to a ripple phase reversal could be recorded. The increasing of ripple density resulted in decrease of evoked potential amplitude. The ripple-density resolution was 8.5 rip/oct at spectrum bandwidth from 5 to 1 oct. This result is in agreement with psychophysical data. At a bandwidth of 0.5 oct, the ripple density resolution was 6.9 rip/oct, which was lower than has been shown in previous psychophysical studies. The difference between psychophysical and evoked-potential data is discussed. [Work supported by The Russian Foundation for Basic Research, grant № 16-34-00742.]