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8.2 Flutter Echo
These parallel, reflective surfaces can also produce a different audible problem. If there is
little absorption at higher frequencies, a musical transient containing high frequencies, such as
a hand clap or the strike of a percussion instrument, can be heard bouncing repeatedly
between the surfaces. Called flutter echo (or slap echo), these multiple reflections can obscure
musical detail. The situation is analogous to standing between two parallel mirrors, when the
outline of your reflection becomes more difficult to discern, due to the additional reflected
images present.
Again, it is only necessary to reduce the reflectiveness of one of the surfaces in each pair of
surfaces to eliminate flutter echo. Since we are concerned with the high frequencies, any soft
material is appropriate. Drapery or fabric wall hangings are quite effective on the walls.
Bookshelves also work well by breaking up the flat surfaces. Carpeting should eliminate
potential problems between the floor and ceiling.