The present study examines the effect of brief tone envelopes on ABR and behavioral thresholds in small groups of normal and hearing-impaired subjects. The hearing-impaired subjects had very steep high-frequency hearing loss in 2-6 kHz region. The stimuli for both ABR and behavioural estimates were 2 and 4 kHz tone burst with linear and nonlinear envelopes. Behavioural thresholds were estimated using a computer controlled, modified block up-down method. The ABR thresholds were evaluated from the recordings collected in automatic acquisition process. Results of our experiments showed that for different stimulus envelopes both behavioural and ABR thresholds were similar in normal range of hearing. However, for impaired ears at high frequencies, both psychoacoustic and ABR thresholds differ, sometimes quite significantly, depending on stimulus envelope.