Echo

This effect repeats the sounds in the audio clip after a specified amount of time. This simulates sound bouncing off a surface, such as a wall some distance away. If you want to simulate the acoustic ambience of a room, see Reverb.

Delay Specifies the interval of time between the original sound and its echo. Moving the Delay slider from Short to Long increases the time between the original sound and its echo.

Intensity Specifies the volume of the echo. Soft produces a faint echo, and Loud produces an echo the same volume as the original.

If you require more control over echo, see Multitap Delay.

Applying Effects > Audio effects included with Premiere > Echo