Definitions for "backdrop"
the background, setting, or circumstances of an event; as, the backdrop for the summit meeting.
A large drapery of painted canvas that provides the rear or upstage masking of a set.
this is a desktop background which may be a sprite or just a pattern
a vertical surface behind your trackwork that is used to extend the concept and vision of your railroad layout
a painting or scenic photograph on the wall behind the layout.
An optional adjustable rectangular area of colour behind a screen element.
the scenery hung at back of stage. Also called in Britain backcloth.
Keywords:  bouncing, absorber, sound, help
a bouncing-sound absorber that can help here